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Note 11 - Equity Method Investment (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Proceeds from Sale of Property, Plant, and Equipment, Total			$ 33,797	$ 51,479
Payments to Acquire Property, Plant, and Equipment, Total			13,971	46,991
Reversal of Deferred Gains of Sale of Property			53	(2)
Income (Loss) from Equity Method Investments, Total	$ 3,382	$ 530	$ 6,342	(205)
Transport Enterprise Leasing LLC [Member]
Equity Method Investment, Ownership Percentage	49.00%		49.00%
Option to Acquire Interest in Equity Method Investment, Percentage of Ownership	51.00%		51.00%
Proceeds from Sale of Property, Plant, and Equipment, Total			$ 1,000	0
Revenue from Related Parties			400	4,400
Payments to Acquire Property, Plant, and Equipment, Total			0	0
Payments for Rent			100	100
Deferred Gain on Sale of Property	$ 100	100	100	100
Reversal of Deferred Gains of Sale of Property			100	100
Due from Related Parties, Total					$ 700
Income (Loss) from Equity Method Investments, Total			6,300
Proceeds from Equity Method Investment, Distribution			0	0
Transport Enterprise Leasing LLC [Member] | Reduction in TEL Investment [Member]
Deferred Gain on Sale of Property	$ 300	$ 200	$ 300	$ 200

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