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Note 9 - Equity Method Investment (Details) (USD $)
 3 Months Ended 9 Months Ended 0 Months Ended 1 Months Ended 9 Months Ended 20 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 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]
Sep. 30, 2014
Scenario, Forecast [Member]
Sep. 30, 2014
Transport Enterprise Leasing, LLC [Member]
Reduction In TEI Investment [Member]
May 31, 2011
Transport Enterprise Leasing, LLC [Member]
Sep. 30, 2014
Transport Enterprise Leasing, LLC [Member]
Dec. 31, 2012
Transport Enterprise Leasing, LLC [Member]
Dec. 31, 2013
Transport Enterprise Leasing, LLC [Member]
Sep. 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   $ 4,900,000    
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 880,000 1,150,000 2,530,000 2,180,000     2,400,000       2,500,000      
Accrued Liabilities, Current 31,018,000   31,018,000   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     69,159,000 39,420,000             9,700,000      
Deferred Gain on Sale of Property                 800,000   100,000      
Due from Related Parties                     1,700,000   1,900,000  
Equity Method Investments                     $ 11,000,000   $ 8,700,000