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Acquisitions North Little Rock Acquisition (Details) (North Little Rock Terminal [Member], USD $)
0 Months Ended 3 Months Ended
Oct. 24, 2013
Mar. 31, 2014
Mar. 31, 2013
North Little Rock Terminal [Member]
     
Business Acquisition [Line Items]      
Purchase price for acquisition $ 5,000,000    
Property, Plant, and Equipment 4,987,000    
Intangible Assets 13,000    
Total Recognized Identifiable Assets Acquired and Liabilities Assumed, Net 5,000,000    
Revenue since Acquisition Date   400,000  
Net Income since Acquisition Date   200,000  
Pro Forma Net Sales     211,251,000
Pro Forma Net Income     $ 7,478,000