FINANCING AGREEMENTS (Details) - USD ($)	12 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Feb. 21, 2014
Long-term indebtedness
Total long-term debt	$ 558,000	$ 681,000
Current maturities	90,000	122,000
Long-term debt, excluding current installments	468,000	559,000
Mortgage note payable
Long-term indebtedness
Total long-term debt	$ 456,000	$ 495,000
Rate	4.05%	4.05%
Monthly installments	$ 4,873	$ 4,873
Final payment	$ 349,000	$ 349,000
Proceeds Received			$ 0
Amount previously repaid			$ 100,000
Line of Credit
Long-term indebtedness
Rate	4.00%	4.00%
Maximum borrowing	$ 500,000	$ 500,000
Interest rate floor	4.00%	4.00%
Line of Credit | Prime Rate
Long-term indebtedness
Rate	3.25%	3.25%
Note Payable
Long-term indebtedness
Equipment financing maximum borrowing	$ 500,000	$ 500,000
Note payable 4.63 percent | Note Payable
Long-term indebtedness
Total long-term debt		$ 36,000
Rate	4.63%	4.63%
Monthly installments	$ 7,123	$ 7,123
Note payable 4.75 percent | Note Payable
Long-term indebtedness
Total long-term debt	$ 53,000	$ 77,000
Rate	4.75%	4.75%
Monthly installments	$ 2,269	$ 2,269
Note payable 3.75 percent | Note Payable
Long-term indebtedness
Total long-term debt	$ 49,000	$ 73,000
Rate	3.75%	3.75%
Monthly installments	$ 2,112	$ 2,112