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Note 10 - Equity Method Investment (Details Textual) - USD ($)	1 Months Ended	12 Months Ended			56 Months Ended
	May. 31, 2011	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	May. 31, 2016
Earnout [Member]
Accrued Liabilities, Current		$ 0			$ 0
Transport Enterprise Leasing LLC [Member] | Reduction in TEL Investment [Member]
Deferred Gain on Sale of Property		800,000	$ 800,000		800,000
Transport Enterprise Leasing LLC [Member] | Based on 2011 Results [Member]
Business Combination, Contingent Consideration, Liability	$ 1,000,000
Transport Enterprise Leasing LLC [Member] | Based on 2012 Results [Member]
Income (Loss) from Equity Method Investments	$ 2,400,000
Transport Enterprise Leasing LLC [Member] | Services Provided [Member]
Revenue from Related Parties		1,300,000	1,500,000
Transport Enterprise Leasing LLC [Member]
Deferred Gain on Sale of Property		100,000			$ 100,000
Proceeds from Equity Method Investment, Dividends or Distributions		$ 0	300,000	$ 100,000
Equity Method Investment, Ownership Percentage	49.00%	49.00%			49.00%
Payments to Acquire Equity Method Investments	$ 1,500,000				$ 4,900,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	$ 4,500,000
Income (Loss) from Equity Method Investments		$ 4,600,000	3,700,000	2,800,000
Proceeds from Sale of Property, Plant, and Equipment		6,200,000	14,000,000
Due from Related Parties		5,300,000	2,200,000		5,300,000
Equity Method Investments		16,800,000	12,200,000		16,800,000
Scenario, Forecast [Member]
Option to Acquire Interest in Equity Method Investment, Percentage of Ownership						100.00%
Accrued Liabilities, Current		$ 30,143,000	36,542,000		30,143,000
Proceeds from Equity Method Investment, Dividends or Distributions			307,000	65,000
Income (Loss) from Equity Method Investments		$ 4,570,000	3,730,000	2,750,000
Proceeds from Sale of Property, Plant, and Equipment		34,287,000	78,776,000	$ 51,930,000
Equity Method Investments		$ 16,788,000	$ 12,192,000		$ 16,788,000

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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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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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