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NOTES PAYABLE - Narrative (Details)
12 Months Ended
Aug. 10, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]      
Amount outstanding   $ 0 $ 0
Revolving Credit Facility | Credit Agreement      
Debt Instrument [Line Items]      
Maximum borrowing capacity     10,000,000
Remaining borrowing capacity   4,500,000 10,000,000
Revolving Credit Facility | Credit Agreement And Our Amended And Restated Guaranty And Security Agreement      
Debt Instrument [Line Items]      
Maximum borrowing capacity $ 5,000,000    
Repayments of debt 5,000,000    
Medium-term Notes | Credit Agreement      
Debt Instrument [Line Items]      
Maximum borrowing capacity     20,000,000
Medium-term Notes | Credit Agreement And Our Amended And Restated Guaranty And Security Agreement      
Debt Instrument [Line Items]      
Maximum borrowing capacity 10,000,000    
Repayments of debt 9,750,000    
Current borrowing capacity 15,000,000    
Amendment fee 225,000    
PPP Loan | Pinnacle Bank | Maximum      
Debt Instrument [Line Items]      
Unforgiven debt   3,250,000  
Monthly periodic payments   $ 185,000  
Periodic Payment One      
Debt Instrument [Line Items]      
Periodic payment 125,000    
Periodic Payment Two      
Debt Instrument [Line Items]      
Periodic payment 250,000    
Debt Instrument Covenant, Period One | Revolving Credit Facility | Credit Agreement      
Debt Instrument [Line Items]      
EBITDA     3,750,000
Debt Instrument Covenant, Period One | Revolving Credit Facility | Third Restated Credit Agreement      
Debt Instrument [Line Items]      
EBITDA $ 3,750,000    
Leverage ratio 3.50    
Fixed charge coverage ratio 1.00    
Debt Instrument Covenant, Period Two | Revolving Credit Facility | Credit Agreement      
Debt Instrument [Line Items]      
EBITDA     4,850,000
Debt Instrument Covenant, Period Two | Revolving Credit Facility | Third Restated Credit Agreement      
Debt Instrument [Line Items]      
EBITDA $ 4,850,000    
Leverage ratio 3.25    
Fixed charge coverage ratio 1.50    
Debt Instrument Covenant, Period Three | Revolving Credit Facility | Credit Agreement      
Debt Instrument [Line Items]      
EBITDA     $ 5,950,000
Debt Instrument Covenant, Period Three | Revolving Credit Facility | Third Restated Credit Agreement      
Debt Instrument [Line Items]      
EBITDA $ 5,950,000    
Leverage ratio 2.50    
Fixed charge coverage ratio 1.60    
Debt Instrument Covenant, Period Four | Revolving Credit Facility | Third Restated Credit Agreement      
Debt Instrument [Line Items]      
Fixed charge coverage ratio 2.00