General form of registration statement for all companies including face-amount certificate companies

CREDIT LINE AND OTHER BORROWINGS (Details)

v3.21.4
CREDIT LINE AND OTHER BORROWINGS (Details)
1 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
Dec. 29, 2020
USD ($)
Nov. 30, 2019
USD ($)
Sep. 01, 2018
USD ($)
Apr. 07, 2017
USD ($)
Jun. 30, 2021
USD ($)
May 30, 2020
USD ($)
Apr. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 26, 2018
USD ($)
Dec. 25, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jan. 01, 2016
USD ($)
Dec. 31, 2015
USD ($)
Affiliated Entity | SSIG                                    
Line of Credit Facility [Line Items]                                    
Proceeds from grant             $ 504,000                      
Paycheck Protection Program                                    
Line of Credit Facility [Line Items]                                    
Proceeds from unsecured loan               $ 3,516,000                    
Repayment of unsecured loan             $ 504,000                      
Debt related interest expense                 $ 197,000 $ 218,000 $ 328,000 $ 298,000            
Paycheck Protection Program | Unsecured Debt                                    
Line of Credit Facility [Line Items]                                    
Proceeds from unsecured loan               $ 3,516,000                    
Repayment of unsecured loan           $ 3,012,000                        
Paycheck Protection Program | Subsequent Event | Unsecured Debt                                    
Line of Credit Facility [Line Items]                                    
Repayment of unsecured loan           $ 3,012,000                        
Line of Credit | Initial Credit Agreement                                    
Line of Credit Facility [Line Items]                                    
Line of credit maximum borrowing capacity                                   $ 6,500,000
Line of Credit | Amended Credit Agreement Maturing October 2018                                    
Line of Credit Facility [Line Items]                                    
Line of credit maximum borrowing capacity                             $ 10,000,000   $ 10,000,000  
Proceeds from line of credit         $ 5,000,000                          
Line of credit outstanding                               $ 5,000,000    
Line of Credit | Amended Credit Agreement Maturing October 2018 | Prime Rate | Minimum                                    
Line of Credit Facility [Line Items]                                    
Debt instrument, variable rate 0.75% 0.75%   0.75% 0.75%                          
Line of Credit | Amended Credit Agreement Maturing October 2018 | Prime Rate | Maximum                                    
Line of Credit Facility [Line Items]                                    
Debt instrument, variable rate 1.00% 1.00%   1.00% 1.00%                          
Line of Credit | Amended Credit Agreement Maturing December 2020                                    
Line of Credit Facility [Line Items]                                    
Line of credit maximum borrowing capacity                           $ 12,000,000        
Proceeds from line of credit       $ 1,000,000             12,000,000              
Line of credit outstanding                     6,000,000   $ 6,000,000          
Repayment of line of credit     $ 6,000,000               $ 6,000,000              
Line of Credit | Amended Credit Agreement Maturing December 2022                                    
Line of Credit Facility [Line Items]                                    
Line of credit maximum borrowing capacity   $ 15,000,000                                
Line of credit outstanding $ 6,000,000               $ 6,000,000                  
Debt covenant, adjusted quick ratio 1.20               1.20   1.20