Note 10 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Insurance and claims	$ 9,453	$ 10,970
Net operating loss carryovers	4,448	7,759
Tax credits	2,499	11,395
Leased liability	9,599	9,969
Finance lease obligation	2,800	3,848
State bonus	2,165	4,860
Other	2,361	4,917
Valuation allowance	0	(242)
Total deferred tax assets	33,325	53,476
Deferred tax liabilities:
Property and equipment	(68,090)	(78,682)
Investment in partnership	(34,400)	(31,585)
ROU Asset- leases	(9,178)	(9,697)
Other	(783)	(4,353)
481(a) - finance leases	(2,177)	(588)
Prepaid expenses	(3,358)	(3,124)
Total deferred tax liabilities	(117,986)	(128,029)
Net deferred tax liability	$ (84,661)	$ (74,553)