Annual report pursuant to Section 13 and 15(d)

CREDIT LINE AND OTHER BORROWINGS (Details)

v3.22.0.1
CREDIT LINE AND OTHER BORROWINGS (Details)
 1 Months Ended 12 Months Ended
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 ($)
Dec. 31, 2021
USD ($)
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]                                
Repayment of unsecured loan           $ 504,000                    
Debt related interest expense               $ 259,000 $ 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                      
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%                        
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%                        
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         6,000 12,000,000              
Line of credit outstanding               $ 6,000 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               $ 15,000              
Debt covenant, adjusted quick ratio                 1.20