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Note 11 - Equity Method Investment (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Proceeds from Sale of Property, Plant, and Equipment, Total	$ 122,278	$ 46,609	$ 61,687
Payments to Acquire Property, Plant, and Equipment, Total	94,049	138,273	75,142
Reversal of Deferred Gains of Sale of Property	14	(7)	(189)
Income (Loss) from Equity Method Investments, Total	$ 3,944	7,017	7,732
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	$ 2,100	0	100
Revenue from Related Parties	6,600	9,400	8,200
Payments to Acquire Property, Plant, and Equipment, Total	0	10,500	1,800
Payments for Rent	600	600	900
Deferred Gain on Sale of Property	100
Reversal of Deferred Gains of Sale of Property	100
Income (Loss) from Equity Method Investments, Total	3,900	7,000	7,700
Proceeds from Equity Method Investment, Distribution	1,500	1,300	$ 2,000
Equity Method Investment, Aggregate Cost	4,900
Transport Enterprise Leasing LLC [Member] | Reduction in TEL Investment [Member]
Deferred Gain on Sale of Property	$ 200	$ 200

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The option to acquire ownership interest in the equity method investment pursuant to the agreement, percentage of ownership interest.

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This element represents the aggregate cost of investments accounted for under the equity method of accounting.

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Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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