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FINANCING AGREEMENTS (Details) - USD ($)
3 Months Ended
Jul. 31, 2016
Apr. 30, 2016
Feb. 21, 2014
Long-term indebtedness      
Total long-term debt $ 536,000 $ 558,000  
Current maturities 91,000 90,000  
Long-term debt, excluding current installments 445,000 468,000  
Mortgage note payable      
Long-term indebtedness      
Total long-term debt $ 446,000 456,000  
Principal amount     $ 542,000
Rate 4.05%    
Monthly installments $ 4,873    
Final payment 349,000    
Line of Credit      
Long-term indebtedness      
Maximum borrowing $ 500,000    
Interest rate floor 4.00%    
Line of Credit | Prime Rate      
Long-term indebtedness      
Rate 3.50%    
Note Payable      
Long-term indebtedness      
Equipment financing maximum borrowing $ 500,000    
Note payable 4.75 percent      
Long-term indebtedness      
Total long-term debt $ 47,000 53,000  
Rate 4.75%    
Monthly installments $ 2,269    
Note payable 3.75 percent      
Long-term indebtedness      
Total long-term debt $ 43,000 $ 49,000  
Rate 3.75%    
Monthly installments $ 2,112