Note 9 - Equity Method Investment (Details) (USD $)	3 Months Ended		6 Months Ended			1 Months Ended	6 Months Ended		9 Months Ended	12 Months Ended	1 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	May 31, 2016 Scenario, Forecast [Member]	May 31, 2011 Transport Enterprise Leasing, LLC [Member]	Jun. 30, 2013 Transport Enterprise Leasing, LLC [Member]	Dec. 31, 2012 Transport Enterprise Leasing, LLC [Member]	Sep. 30, 2012 Transport Enterprise Leasing, LLC [Member]	Dec. 31, 2012 Earnout [Member]	Dec. 31, 2012 Maximum [Member]
Note 9 - Equity Method Investment (Details) [Line Items]
Equity Method Investment, Ownership Percentage					100.00%	49.00%
Payments to Acquire Businesses, Gross						$ 1,500,000
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value											4,500,000
Payments to Acquire Businesses and Interest in Affiliates										2,900,000
Proceeds from Sale of Property, Plant, and Equipment			26,875,000	37,685,000			7,600,000		300,000
Equity Method Investment, Deferred Gain on Sale							1,000,000
Due from Related Parties							1,300,000	800,000
Income (Loss) from Equity Method Investments	550,000	425,000	1,030,000	670,000			1,000,000
Equity Method Investments							$ 6,900,000	$ 6,100,000