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Note 12 - Federal and State Income Taxes - Significant Components of Deferred Tax Liabilities and Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax liabilities:
Property and equipment	$ 100,736	$ 83,453
Unrealized gains on securities	2,580	2,580
Prepaid expenses and other	2,599	2,193
Total deferred tax liabilities	105,915	88,226
Deferred tax assets:
Current expected credit losses	896	760
Tax credit carryforwards	988	988
Compensated absences	189	512
Self-insurance allowances	674	5,630
Marketable equity securities	2,129	1,253
Net operating loss carryover	32,031	15,364
Other	125	197
Total deferred tax assets	37,032	24,704
Net deferred tax liability	$ 68,883	$ 63,522

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