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Note 6 - Leases - Balance Sheet Information Related to Leases (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Operating lease $ 42,944 $ 42,023
Operating lease accumulated amortization (15,437) (14,297)
Operating lease right-of-use asset, net 27,507 27,726
Current portion of lease liabilities 6,127 5,940
Operating lease, operating lease liabilities 21,849 22,137
Total operating lease liabilities 27,976 28,077
Property and equipment, at cost 419,732 413,396
Accumulated depreciation (272,786) (266,340)
Finance lease, net 1,425 1,745
Finance lease current liabilities 534 661
Finance lease liabilities 923 1,115
Total finance lease liabilities $ 1,457 $ 1,776
Operating leases (in years) (Year) 6 years 6 years
Finance leases (in years) (Year) 3 years 4 years
Operating leases 3.35% 3.44%
Finance leases 3.49% 3.42%
Assets Held Under Finance Leases [Member]    
Property and equipment, at cost $ 2,803 $ 2,710
Accumulated depreciation $ (1,378) $ (965)