Quarterly report pursuant to Section 13 or 15(d)

CREDIT LINE AND OTHER BORROWINGS (Details)

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CREDIT LINE AND OTHER BORROWINGS (Details)
1 Months Ended 3 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 ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2018
USD ($)
Dec. 26, 2018
USD ($)
Dec. 25, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
SSIG | Affiliated Entity                                
Line of Credit Facility [Line Items]                                
Proceeds from grant           $ 504,000                    
Paycheck Protection Program                                
Line of Credit Facility [Line Items]                                
Debt related interest expense               $ 61,000 $ 67,000              
Unsecured Debt | Paycheck Protection Program                                
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         6,000,000   $ 12,000,000            
Line of credit outstanding               6,000,000   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             $ 15,000,000                
Debt covenant, adjusted quick ratio                   1.20