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INDEBTEDNESS (Schedule of Credit Agreement) (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Revolving credit facility $ 18,000 $ 20,000
Accumulated amortization of deferred financing costs 430 319
Less: deferred financing costs, net of accumulated amortization of $430 and $319 (307) (417)
Total borrowed 17,693 19,583
Line of Credit Facility, Remaining Borrowing Capacity $ 72,000 $ 70,000
Line of Credit Facility, Commitment Fee Percentage 0.30% 0.35%
London Interbank Offered Rate (LIBOR) [Member]    
Debt Instrument [Line Items]    
Interest margin 1.75% 2.00%
Actual interest rates 1.88% 2.19%