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Note 11 - Equity Method Investment (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Proceeds from Sale of Property, Plant, and Equipment, Total	$ 13,871	$ 18,497
Payments to Acquire Property, Plant, and Equipment, Total	3,907	35,240
Reversal of Deferred Gains of Sale of Property	45	(2)
Income (Loss) from Equity Method Investments, Total	$ 2,960	(735)
Transport Enterprise Leasing LLC [Member]
Equity Method Investment, Ownership Percentage	49.00%
Option to Acquire Interest in Equity Method Investment, Percentage of Ownership	51.00%
Proceeds from Sale of Property, Plant, and Equipment, Total	$ 800	0
Revenue from Related Parties	300	2,300
Payments to Acquire Property, Plant, and Equipment, Total	0	0
Payments for Rent	100	100
Deferred Gain on Sale of Property	100
Reversal of Deferred Gains of Sale of Property		100
Due from Related Parties, Total	1,000		$ 700
Income (Loss) from Equity Method Investments, Total	3,000
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

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