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Note 11 - Equity Method Investment (Details Textual) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Proceeds from Sale of Property, Plant, and Equipment, Total		$ 44,134	$ 122,278
Payments to Acquire Property, Plant, and Equipment, Total		35,285	94,049
Income (Loss) from Equity Method Investments, Total		$ 14,782	3,944
Transport Enterprise Leasing LLC [Member]
Equity Method Investment, Ownership Percentage	49.00%	49.00%
Proceeds from Sale of Property, Plant, and Equipment, Total		$ 300	2,100
Revenue from Related Parties		900	6,600
Payments to Acquire Property, Plant, and Equipment, Total	$ 0
Payments for Rent		600	600
Deferred Gain on Sale of Property		100	0
Income (Loss) from Equity Method Investments, Total		14,800	3,900
Proceeds from Equity Method Investment, Distribution		4,900	1,500
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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Amount of gain on the sale of property that does not qualify for gain recognition as of the balance sheet date.

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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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Amount of income (loss) for proportionate share of equity method investee's income (loss).

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Cash payments to lessor's for use of assets under operating leases.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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