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CREDIT FACILITY AND ACQUISITION DEBT Credit Facility (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
May 13, 2021
USD ($)
Debt Instrument [Line Items]          
Credit Facility amortization of debt issuance costs     $ 345 $ 393  
Ratio Actual [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Ratio of indebtedness to net capital (in Ratio) (below at March 31, 2015)     0.25    
Credit Agreement 2018 [Member] | Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Credit Facility amortization of debt issuance costs $ 99 $ 118 $ 217 $ 245  
Long-term Debt $ 47,200   60,500   $ 58,800
Line of Credit [Member] | Revolving Credit Facility, Secured, Floating Rate [Member]          
Debt Instrument [Line Items]          
Remaining borrowing capacity         89,100
Line of Credit [Member] | Revolving Credit Facility, Secured, Floating Rate [Member] | Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Long-term Debt     60,500    
Remaining borrowing capacity     $ 87,400   $ 21,400