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Note 8 - Leases - Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Operating lease	$ 36,060	$ 31,506
Operating lease accumulated amortization	(10,706)	(5,808)
Operating lease right of use asset, net	25,354	25,698
Current portion of lease liabilities	5,580	5,481
Operating lease, operating lease liabilities	19,965	20,418
Finance lease	434,579	417,124
Finance lease accumulated depreciation	(277,379)	(260,331)
Finance lease, net	3,249	546
Finance lease current liabilities	815	108
Finance lease liabilities	2,453	443
Finance Lease, Liability, Total	$ 3,268	$ 551
Operating leases (Year)	7 years
Finance leases (Year)	6 years
Operating leases	3.76%	3.72%
Finance leases	3.80%	4.01%
Current Portion and Lease Liabilities [Member]
Operating Lease, Liability, Total	$ 25,545	$ 25,899
Assets Held Under Finance Leases [Member]
Finance lease	3,582	613
Finance lease accumulated depreciation	$ (333)	$ (67)

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