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Note 9 - Equity Method Investment (Detail) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 3 Months Ended
Sep. 30, 2012
Jun. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
May 31, 2013
May 31, 2011
May 31, 2016
Option to Purchase [Member]
Sep. 30, 2012
Transport Enterprise Leasing, LLC [Member]
Dec. 31, 2011
Transport Enterprise Leasing, LLC [Member]
Jun. 30, 2012
Earnout [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       52,851,000 51,869,000         7,200,000    
Equity Method Investment, Deferred Gain on Sale       700,000   600,000       200,000    
Due from Related Parties                   1,100,000 600,000  
Income (Loss) from Equity Method Investments 555,000   350,000 1,225,000 475,000         1,200,000    
Equity Method Investments 3,300,000     3,300,000   2,400,000            
Proceeds from Equity Method Investment, Dividends or Distributions   $ 100,000   $ 139,000 $ 241,000