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Note 6 - Leases - Lease Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Operating lease cost $ 1,733 $ 1,767 $ 5,148 $ 5,322
Finance lease cost:        
Amortization of right-of-use assets 210 62 634 182
Interest on lease liabilities 23 13 76 39
Total finance lease cost $ 233 $ 75 $ 710 $ 221