Note 10 - Equity Method Investment (Details) (USD $)	12 Months Ended				0 Months Ended		12 Months Ended				1 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	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]	Dec. 31, 2013 Scenario, Forecast [Member]	Dec. 31, 2013 Transport Enterprise Leasing, LLC [Member] Services Provided [Member]	Dec. 31, 2012 Transport Enterprise Leasing, LLC [Member] Services Provided [Member]	Dec. 31, 2013 Transport Enterprise Leasing, LLC [Member] Reduction In TEI Investment [Member]	Dec. 31, 2012 Transport Enterprise Leasing, LLC [Member] Reduction In TEI Investment [Member]	May 31, 2011 Transport Enterprise Leasing, LLC [Member]	Dec. 31, 2013 Transport Enterprise Leasing, LLC [Member]	Dec. 31, 2012 Transport Enterprise Leasing, LLC [Member]	Dec. 31, 2011 Transport Enterprise Leasing, LLC [Member]	Dec. 31, 2013 Earnout [Member]	Dec. 31, 2012 Earnout [Member]
Note 10 - Equity Method Investment (Details) [Line Items]
Equity Method Investment, Ownership Percentage											49.00%	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	2,750,000	1,875,000	675,000		2,400,000							2,800,000	1,900,000	700,000
Accrued Liabilities, Current	28,185,000	27,884,000													0	500,000
Option To Acquire Interest In Equity Method Investment, Percentage of Ownership						100.00%
Proceeds from Sale of Property, Plant, and Equipment	51,930,000	57,525,000	65,318,000									16,000,000	8,600,000
Revenue from Related Parties							2,400,000	2,100,000
Deferred Gain on Sale of Property									800,000	800,000		100,000	200,000
Due from Related Parties												1,900,000	800,000
Proceeds from Equity Method Investment, Dividends or Distributions	65,000	316,000	241,000									100,000	300,000	200,000
Equity Method Investments	$ 8,737,000	$ 6,133,000										$ 8,700,000	$ 6,100,000