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Note 6 - Leases - Balance Sheet Information Related to Leases (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Operating lease $ 35,547 $ 36,060
Operating lease accumulated amortization (11,450) (10,706)
Operating lease right-of-use asset, net 24,097 25,354
Current portion of lease liabilities 5,436 5,580
Operating lease, operating lease liabilities 18,893 19,965
Total operating lease liabilities 24,329 25,545
Property and equipment, at cost 436,850 434,579
Accumulated depreciation (282,226) (277,379)
Finance lease, net 3,037 3,249
Finance lease current liabilities 822 815
Finance lease liabilities 2,245 2,453
Total finance lease liabilities $ 3,067 $ 3,268
Operating leases (in years) (Year)   7 years
Finance leases (in years) (Year)   6 years
Operating leases 3.75% 3.76%
Finance leases 3.50% 3.80%
Assets Held Under Finance Leases [Member]    
Property and equipment, at cost $ 3,582 $ 3,582
Accumulated depreciation $ (545) $ (333)