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FINANCING ARRANGEMENTS - Monthly revolving line of credit (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Sep. 30, 2021
Line of Credit Facility      
Borrowings under line of credit $ 15,000,000 $ 15,000,000  
Revolving Credit Facility | 2021 Amended Term Loan | Line of Credit      
Line of Credit Facility      
Maximum borrowing capacity     $ 25,000,000
Borrowings under line of credit 15,000,000 15,000,000  
Remaining borrowing capacity $ 10,000,000 $ 0  
Revolving Credit Facility | 2021 Amended Term Loan | Reference Rate | Line of Credit      
Line of Credit Facility      
Variable rate (percent) 1.00% 1.00%  
Revolving Credit Facility | Secured Debt with CIBC | Line of Credit      
Line of Credit Facility      
Maximum borrowing capacity   $ 15,000,000  
Effective interest rate (percent) 4.25% 4.25%