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Secured Revolving Credit Facility - Additional Information (Detail) - Secured Revolving Credit Facility [Member] - USD ($)
 12 Months Ended
Mar. 20, 2015
May. 31, 2015
Line of Credit Facility [Line Items]    
Maximum borrowing capacity $ 10,000,000  
Credit facility, interest rate 3.75%  
Interest rate description   Loan advances bear interest at 3.75% in excess of The Wall Street Journal's published one year LIBOR rate
Secured revolving credit facility term 3 years  
Secured revolving credit facility renewal term 1 year  
Facility fee amount $ 150,000  
Annual facility fees $ 50,000  
Unused line fee payable in arrears per annum 0.25%  
Percentage of monthly bank assessment fees per annum 0.25%  
Overadvance fees per day $ 1,000  
Percentage of monthly letter of credit fees payable in arrears 0.25%  
Covenants limit on capital expenditures per year $ 600,000  
Unpaid balances interest rate 3.00%