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FINANCING AGREEMENTS (Details) - USD ($)
9 Months Ended
Jan. 31, 2016
Apr. 30, 2015
Feb. 21, 2014
Long-term indebtedness      
Current maturities $ 89,000 $ 122,000  
Long-term Debt, Excluding Current Maturities 491,000 559,000  
Total long-term debt 580,000 681,000  
Mortgage note payable      
Long-term indebtedness      
Long-term Debt $ 466,000 495,000  
Principal amount     $ 542,000
Rate 4.05%    
Final Payment $ 349,000    
Monthly installments $ 4,873    
Line of Credit      
Long-term indebtedness      
Rate 4.00%    
Interest rate floor 4.00%    
Line of Credit | Prime Rate      
Long-term indebtedness      
Rate 3.25%    
Note Payable      
Long-term indebtedness      
Maximum borrowing $ 500,000    
Equipment financing maximum borrowing $ 500,000    
Note payable 4.63 percent      
Long-term indebtedness      
Long-term Debt   36,000  
Rate 4.63%    
Monthly installments $ 7,123    
Note payable 4.75 percent      
Long-term indebtedness      
Long-term Debt $ 59,000 77,000  
Rate 4.75%    
Monthly installments $ 2,269    
Note payable 3.75 percent      
Long-term indebtedness      
Long-term Debt $ 55,000 $ 73,000  
Rate 3.75%    
Monthly installments $ 2,112