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Note 9 - Equity Method Investment (Detail) (USD $)
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
May 31, 2013
Dec. 31, 2011
May 31, 2011
Jun. 30, 2012
Earnout [Member]
May 31, 2016
Option to Purchase [Member]
Jun. 30, 2012
Transport Enterprise Leasing, LLC [Member]
Dec. 31, 2011
Transport Enterprise Leasing, LLC [Member]
Equity Method Investment, Ownership Percentage             49.00%   100.00%    
Equity Method Investment, Summarized Financial Information, Noncontrolling Interest             $ 1,500,000        
Business Acquisition, Contingent Consideration, at Fair Value         4,500,000            
Payments to Acquire Businesses and Interest in Affiliates               1,000,000      
Proceeds from Sale of Property, Plant, and Equipment     37,685,000 32,829,000           5,600,000  
Equity Method Investment, Deferred Gain on Sale                   100,000  
Due from Related Parties                   1,100,000 600,000
Income (Loss) from Equity Method Investments 425,000 125,000 670,000 125,000           700,000  
Equity Method Investments 2,900,000   2,900,000     2,400,000          
Equity Method Investments Accumulated Deferred Gains 600,000   600,000     600,000          
Equity Method Investment, Dividends or Distributions $ 100,000   $ 139,000