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Note 9 - Equity Method Investment (Details) (USD $)
 3 Months Ended 0 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2014
Mar. 31, 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]
Mar. 31, 2014
Scenario, Forecast [Member]
Mar. 31, 2014
Transport Enterprise Leasing, LLC [Member]
Reduction In TEI Investment [Member]
May 31, 2011
Transport Enterprise Leasing, LLC [Member]
Mar. 31, 2014
Transport Enterprise Leasing, LLC [Member]
Dec. 31, 2013
Transport Enterprise Leasing, LLC [Member]
Mar. 31, 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 800,000 480,000     2,400,000       800,000    
Accrued Liabilities, Current 27,279,000   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 19,920,000 11,690,000             2,300,000    
Deferred Gain on Sale of Property             900,000   100,000    
Due from Related Parties                 1,400,000 1,900,000  
Equity Method Investments                 $ 9,500,000 $ 8,700,000