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Term Loans Payable (Narrative) (Details) - USD ($)
12 Months Ended
May 31, 2017
Aug. 31, 2016
Feb. 28, 2017
Sep. 01, 2016
Sixth Modification Agreement [Member]        
Debt Instrument [Line Items]        
Fixed charge coverage ratio     85.00%  
Seventh Modification Agreement [Member] | Extended Maturity [Member]        
Debt Instrument [Line Items]        
Maturity date Mar. 31, 2020      
Revolving Line Of Credit [Member]        
Debt Instrument [Line Items]        
Maximum borrowing capacity $ 35,000,000      
Term Loan [Member]        
Debt Instrument [Line Items]        
Loan amount   $ 15,000,000   $ 5,000,000
Percentage added to LIBOR rate   1.85%    
Principal payment   $ 312,500    
Remaining principal amount that may be repaid or converted   $ 1,250,000