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Note 6 - Leases - Balance Sheet Information Related to Leases (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Operating lease $ 40,704 $ 42,023
Operating lease accumulated amortization (14,543) (14,297)
Operating lease right-of-use asset, net 26,161 27,726
Current portion of lease liabilities 5,801 5,940
Operating lease, operating lease liabilities 20,746 22,137
Total operating lease liabilities 26,547 28,077
Property and equipment, at cost 413,136 413,396
Accumulated depreciation (269,542) (266,340)
Finance lease, net 1,611 1,745
Finance lease current liabilities 613 661
Finance lease liabilities 1,028 1,115
Total finance lease liabilities $ 1,641 $ 1,776
Operating leases (in years) (Year) 6 years 6 years
Finance leases (in years) (Year) 3 years 4 years
Operating leases 3.44% 3.44%
Finance leases 3.48% 3.42%
Assets Held Under Finance Leases [Member]    
Property and equipment, at cost $ 2,803 $ 2,710
Accumulated depreciation $ (1,192) $ (965)