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Term Loans Payable And Revolving Line Of Credit (Narrative) (Details) - USD ($)
12 Months Ended
Aug. 17, 2018
Aug. 31, 2018
Aug. 31, 2017
Sep. 30, 2016
Debt Instrument [Line Items]        
Maturity date   Jan. 01, 2019    
Outstanding amount on the revolving line of credit   $ 0 $ 0  
Revolving Line Of Credit [Member]        
Debt Instrument [Line Items]        
Current borrowing capacity   $ 30,000,000    
Maturity date   Mar. 31, 2021    
Percentage added to LIBOR rate   1.85%    
Fixed charge coverage ratio   1.15%    
Unused commitment fee   0.25%    
Maximum asset coverage ratio   150.00%    
Maximum funded debt to EBITDAR ratio   3.00    
Limit on capital expenditures   $ 8,000,000    
Outstanding amount on the revolving line of credit   $ 11,300,000 4,400,000  
Term Loan [Member]        
Debt Instrument [Line Items]        
Loan amount     $ 5,000,000 $ 5,000,000
Percentage added to LIBOR rate   1.85%    
Maturity term   3 years    
Term Loan [Member] | Ninth Modification Agreement [Member]        
Debt Instrument [Line Items]        
Loan amount $ 15,000,000      
Term Loan [Member] | Ninth Modification Agreement [Member] | Extended Maturity [Member]        
Debt Instrument [Line Items]        
Maturity date Mar. 31, 2021      
Maturity term 1 year      
Term Loan [Member] | Additional [Member] | Minimum [Member] | Ninth Modification Agreement [Member]        
Debt Instrument [Line Items]        
Loan amount $ 5,000,000      
Term Loan [Member] | Additional [Member] | Maximum [Member] | Ninth Modification Agreement [Member]        
Debt Instrument [Line Items]        
Loan amount $ 40,000,000      
Term Loans And Revolving Line of Credit [Member]        
Debt Instrument [Line Items]        
Interest rate   3.90% 3.10%