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NOTE H - INVESTMENT IN MORION, INC. (Details) - Morion Inc [Member] - USD ($)
3 Months Ended
Jul. 31, 2018
Jul. 31, 2017
NOTE H - INVESTMENT IN MORION, INC. (Details) [Line Items]    
Cost Method Investment Ownership Percentage 4.60%  
Related Party Transaction, Purchases from Related Party $ 68,000 $ 64,000
Revenue from Related Parties 2,000 182,000
Accounts Payable, Related Parties, Current $ 4,000  
Proceeds from Dividends Received   $ 51,000