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FINANCING AGREEMENTS (Details) - USD ($)
12 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Mar. 31, 2017
Long-term indebtedness      
Total long-term debt $ 1,836,000 $ 1,048,000  
Less current installments 1,706,000 603,000  
Long-term debt, excluding current installments 130,000 445,000  
Minimum Tangible Net Worth 4,500,000    
Mortgage note payable      
Long-term indebtedness      
Annual prepayment limit 100,000    
Capital Leases      
Long-term indebtedness      
Total long-term debt 170,000    
Note payable 4.05 percent | Mortgage note payable      
Long-term indebtedness      
Total long-term debt $ 373,000 415,000  
Rate 4.05%    
Monthly installments $ 4,873    
Final payment $ 349,000    
Working line of credit 4.00 percent | Minimum      
Long-term indebtedness      
Rate 4.00%    
Working line of credit 4.00 percent | Prime Rate      
Long-term indebtedness      
Rate 4.75%    
Working line of credit 4.00 percent | Line of Credit      
Long-term indebtedness      
Total long-term debt $ 751,000 465,000  
Rate 4.00%    
Maximum borrowing $ 1,250,000    
Building line of credit 4.00 percent | Minimum      
Long-term indebtedness      
Rate     4.00%
Building line of credit 4.00 percent | Prime Rate      
Long-term indebtedness      
Rate     4.75%
Building line of credit 4.00 percent | Line of Credit      
Long-term indebtedness      
Total long-term debt $ 465,000    
Rate 4.00%    
Maximum borrowing     $ 500,000
Note payable 4.75 percent | Note Payable      
Long-term indebtedness      
Total long-term debt $ 2,000 28,000  
Rate 4.75%    
Monthly installments $ 2,269    
Note payable 3.75 percent | Note Payable      
Long-term indebtedness      
Total long-term debt   25,000  
Rate 3.75%    
Monthly installments $ 2,112    
Note payable 4.05 percent | Note Payable      
Long-term indebtedness      
Total long-term debt $ 75,000 $ 115,000  
Rate 4.05%    
Monthly installments $ 3,680    
Equipment line of credit      
Long-term indebtedness      
Equipment financing maximum borrowing $ 500,000