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DEBT (Details)
1 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Mar. 31, 2021
USD ($)
item
Dec. 31, 2020
USD ($)
DEBT        
Restricted CDARS account     $ 5,000,000 $ 5,000,000
Finance lease     $ 86,000 $ 98,000
Dominion Loan Agreement        
DEBT        
Maturity of line of credit extended 1 year      
Maximum borrowing capacity $ 15,000,000 $ 15,000,000    
Percentage of maximum borrowing capacity on eligible accounts receivable 80.00%      
Percentage of maximum borrowing capacity on deposit with lender 100.00%      
Restricted CDARS account $ 5,000,000      
Commitment fee (as a percent)   0.10%    
Minimum tangible net worth   $ 75,000,000    
Dominion Loan Agreement | Minimum        
DEBT        
Interest rate (as a percent)   3.50%    
Dominion Loan Agreement | Maximum        
DEBT        
Interest rate (as a percent)   6.00%    
Dominion Letters of Credit        
DEBT        
Number of letters of credit | item     1  
Amount of letter of credit     $ 583,000  
Notes payable to finance companies for insurance        
DEBT        
Interest rate (as a percent)     4.99% 4.99%
Number of notes payable | item     1  
Aggregate principal amount outstanding     $ 501,000 $ 40,000
Notes payable to finance companies for insurance | Minimum        
DEBT        
Interest rate (as a percent)       4.99%