Note 9 - Equity Method Investment (Details) (USD $)	3 Months Ended		6 Months Ended				0 Months Ended			1 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	May 31, 2011 Based On 2011 Results [Member] Transport Enterprise Leasing, LLC [Member]	May 31, 2011 Based On 2012 Results [Member] Transport Enterprise Leasing, LLC [Member]	Jun. 30, 2014 Scenario, Forecast [Member]	Jun. 30, 2014 Transport Enterprise Leasing, LLC [Member] Reduction In TEI Investment [Member]	May 31, 2011 Transport Enterprise Leasing, LLC [Member]	Jun. 30, 2014 Transport Enterprise Leasing, LLC [Member]	Dec. 31, 2013 Transport Enterprise Leasing, LLC [Member]	Jun. 30, 2014 Earnout [Member]
Note 9 - Equity Method Investment (Details) [Line Items]
Equity Method Investment, Ownership Percentage										49.00%
Payments to Acquire Equity Method Investments										$ 1,500,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High										4,500,000
Business Combination, Contingent Consideration, Liability						1,000,000
Income (Loss) from Equity Method Investments	850,000	550,000	1,650,000	1,030,000			2,400,000				1,700,000
Accrued Liabilities, Current	28,769,000		28,769,000		28,185,000								0
Option To Acquire Interest In Equity Method Investment, Percentage of Ownership								100.00%
Proceeds from Sale of Property, Plant, and Equipment			48,540,000	26,875,000							4,900,000
Deferred Gain on Sale of Property									800,000		100,000
Due from Related Parties											1,800,000	1,900,000
Equity Method Investments											$ 10,200,000	$ 8,700,000