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Note 9 - Equity Method Investment (Detail) (USD $)	3 Months Ended							12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Transport Enterprise Leasing, LLC [Member]	Dec. 31, 2012 Transport Enterprise Leasing, LLC [Member]	May 31, 2011 Transport Enterprise Leasing, LLC [Member]	May 31, 2016 Scenario, Forecast [Member]	Dec. 31, 2012 Maximum [Member]	Dec. 31, 2012 Earnout [Member]
Equity Method Investment, Ownership Percentage					49.00%	100.00%
Business Acquisition, Cost of Acquired Entity, Purchase Price					$ 1,500,000
Business Acquisition, Contingent Consideration, at Fair Value							4,500,000
Payments to Acquire Businesses and Interest in Affiliates								2,900,000
Proceeds from Sale of Property, Plant, and Equipment	11,690,000	21,304,000	2,800,000
Equity Method Investment, Deferred Gain on Sale			800,000
Due from Related Parties			1,000,000	800,000
Income (Loss) from Equity Method Investments	480,000	245,000	500,000
Equity Method Investments			$ 6,500,000	$ 6,100,000

X

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Fair value, as of the acquisition date, of potential payments under the contingent consideration arrangement including cash and shares.

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