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Debt (Details 2) (USD $)
3 Months Ended 0 Months Ended
May 31, 2014
Mar. 01, 2014
Unsecured state industrial development loan
May 31, 2014
Unsecured state industrial development loan
Mar. 31, 2014
Unsecured state industrial development loan
Long-term debt        
Face amount     $ 37,610,000 $ 37,610,000
Principal payment made 1,900,000 1,900,000    
Outstanding principal payable on March 1, 2015     1,900,000  
Outstanding principal payable on March 1, 2016     3,800,000  
Outstanding principal payable on March 1, 2017     5,700,000  
Outstanding principal payable on March 1, 2018     1,900,000  
Outstanding principal payable on March 1, 2019     1,900,000  
Outstanding principal payable on March 1, 2020     1,900,000  
Outstanding principal payable on March 1, 2021     1,900,000  
Outstanding principal payable on March 1, 2022     1,900,000  
Outstanding principal payable on March 1, 2023     $ 14,810,000