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Long-Term Debt (Details) (USD $)
0 Months Ended
Nov. 08, 2012
Aug. 20, 2012
Sep. 30, 2013
Sep. 30, 2012
Debt Instrument [Line Items]        
Revolving term loan $ 11,000,000   $ 0 $ 3,237,000
Note payable to Iowa Department of Transportation     187,053 238,021
Long-term debt, total     187,053 3,475,021
Less current maturities     (52,049) (50,968)
Long-term debt, less current maturities     135,004 3,424,053
Maturities of Long-term Debt [Abstract]        
2013     52,049  
2014     53,153  
2015     54,281  
2016     27,570  
Description of variable rate basis LIBOR      
Basis spread on variable rate 4.00%      
Line of credit facility, unused capacity, commitment fee percentage   0.60%    
Railroad revolving loan fund     $ 500,000  
Debt instrument, interest rate, stated percentage     2.11%