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Subsequent Events (Details) - USD ($)
9 Months Ended
May 15, 2020
Apr. 30, 2020
Jul. 31, 2019
Subsequent Event      
Debt Instrument, Annual Principal Payment   $ 3,074,000 $ 3,083,000
License Payment      
Subsequent Event      
Proceeds from License to be Received $ 13,000,000    
Pension      
Subsequent Event      
Lump Sum Payment for Pension Benefits $ 2,000,000    
Series A Senior Note      
Subsequent Event      
Debt Instrument, Interest Rate, Stated Percentage   3.96%  
Debt Instrument, Maturity Date   Aug. 01, 2020  
Debt Instrument, Face Amount   $ 18,500,000  
Debt Instrument, Annual Principal Payment   $ 3,100,000  
Series B Senior Note | Amended Note Agreement      
Subsequent Event      
Debt Instrument, Interest Rate, Stated Percentage 3.95%    
Debt Instrument, Maturity Date May 15, 2030    
Debt Instrument, Face Amount $ 10,000,000    
Senior Note, Maximum Borrowing Capacity $ 75,000,000