| 2021-11-03           | 
                                                                                        3,4,5           | 
                                                                                        4           | 
                                                                                        Statement of changes in beneficial ownership of securities           | 
                                                                                        FEARON RICHARD H           | 
                                       | 
                                       | 
                                       | 
                                       | 
              
          
                                                                                        | 2021-11-03           | 
                                                                                        3,4,5           | 
                                                                                        4           | 
                                                                                        Statement of changes in beneficial ownership of securities           | 
                                                                                        OWENS B CRAIG           | 
                                       | 
                                       | 
                                       | 
                                       | 
              
          
                                                                                        | 2021-11-03           | 
                                                                                        3,4,5           | 
                                                                                        4           | 
                                                                                        Statement of changes in beneficial ownership of securities           | 
                                                                                        Lee Rose           | 
                                       | 
                                       | 
                                       | 
                                       | 
              
          
                                                                                        | 2021-11-03           | 
                                                                                        3,4,5           | 
                                                                                        4           | 
                                                                                        Statement of changes in beneficial ownership of securities           | 
                                                                                        URKIEL WILLIAM S           | 
                                       | 
                                       | 
                                       | 
                                       | 
              
          
                                                                                        | 2021-11-03           | 
                                                                                        3,4,5           | 
                                                                                        4           | 
                                                                                        Statement of changes in beneficial ownership of securities           | 
                                                                                        Sweitzer Caesar F           | 
                                       | 
                                       | 
                                       | 
                                       | 
              
          
                                                                                        | 2021-11-03           | 
                                                                                        3,4,5           | 
                                                                                        4           | 
                                                                                        Statement of changes in beneficial ownership of securities           | 
                                                                                        HAGGE STEPHEN J           | 
                                       | 
                                       | 
                                       | 
                                       | 
              
          
                                                                                        | 2021-11-03           | 
                                                                                        3,4,5           | 
                                                                                        4           | 
                                                                                        Statement of changes in beneficial ownership of securities           | 
                                                                                        Funk Andrea J.           | 
                                       | 
                                       | 
                                       | 
                                       | 
              
          
                                                                                        | 2021-11-02           | 
                                                                                        Current Reports           | 
                                                                                        8-K           | 
                                                                                        Report of unscheduled material events or corporate event           | 
                                                                                                   | 
                                       | 
                                       | 
                                       | 
                                       | 
              
          
                                                                                        | 2021-11-02           | 
                                                                                        Other           | 
                                                                                        CORRESP           | 
                                                                                        CORRESP           | 
                                                                                                   | 
                                       | 
                                       | 
                                       | 
                                       | 
              
          
                                                                                        | 2021-11-01           | 
                                                                                        Quarterly Filings           | 
                                                                                        10-Q           | 
                                                                                        Quarterly report which provides a continuing view of a company's financial position           | 
                                                                                                   | 
                                       | 
                                       | 
                                       | 
                                       | 
              
          
                                                                                        | 2021-10-25           | 
                                                                                        Current Reports           | 
                                                                                        8-K           | 
                                                                                        Report of unscheduled material events or corporate event           | 
                                                                                                   | 
                                       | 
                                       | 
                                       | 
                                       | 
              
          
                                                                                        | 2021-10-21           | 
                                                                                        Other           | 
                                                                                        UPLOAD           | 
                                                                                        UPLOAD           | 
                                                                                                   | 
                                       | 
                                       | 
                                       | 
                                       | 
              
          
                                                                                        | 2021-10-08           | 
                                                                                        Other           | 
                                                                                        SC 13G/A           | 
                                                                                        An amendment to the SC 13G filing           | 
                                                                                                   | 
                                       | 
                                       | 
                                       | 
                                       | 
              
          
                                                                                        | 2021-10-01           | 
                                                                                        Current Reports           | 
                                                                                        8-K           | 
                                                                                        Report of unscheduled material events or corporate event           | 
                                                                                                   | 
                                       | 
                                       | 
                                       | 
                                       | 
              
          
                                                                                        | 2021-09-16           | 
                                                                                        3,4,5           | 
                                                                                        4           | 
                                                                                        Statement of changes in beneficial ownership of securities           | 
                                                                                        Beaver David A.           | 
                                       | 
                                       | 
                                       | 
                                       | 
              
          
                                                                                        | 2021-09-14           | 
                                                                                        Current Reports           | 
                                                                                        8-K           | 
                                                                                        Report of unscheduled material events or corporate event           | 
                                                                                                   | 
                                       | 
                                       | 
                                       | 
                                       | 
              
          
                                                                                        | 2021-09-03           | 
                                                                                        Current Reports           | 
                                                                                        8-K           | 
                                                                                        Report of unscheduled material events or corporate event           | 
                                                                                                   | 
                                       | 
                                       | 
                                       | 
                                       | 
              
          
                                                                                        | 2021-08-31           | 
                                                                                        3,4,5           | 
                                                                                        4           | 
                                                                                        Statement of changes in beneficial ownership of securities           | 
                                                                                        GOH HOCK HUAT           | 
                                       | 
                                       | 
                                       | 
                                       | 
              
          
                                                                                        | 2021-08-11           | 
                                                                                        3,4,5           | 
                                                                                        4           | 
                                                                                        Statement of changes in beneficial ownership of securities           | 
                                                                                        OWENS B CRAIG           | 
                                       | 
                                       | 
                                       | 
                                       | 
              
          
                                                                                        | 2021-08-11           | 
                                                                                        3,4,5           | 
                                                                                        4           | 
                                                                                        Statement of changes in beneficial ownership of securities           | 
                                                                                        Bourque Robert H Jr           | 
                                       | 
                                       | 
                                       | 
                                       |