NOTE G - INVESTMENT IN MORION, INC. (Details) - Morion Inc [Member] - USD ($)		1 Months Ended	3 Months Ended		12 Months Ended
	Oct. 22, 2012	Nov. 30, 2012	Jul. 31, 2015	Jul. 31, 2014	Apr. 30, 2015
NOTE G - INVESTMENT IN MORION, INC. (Details) [Line Items]
Cost Method Investment Ownership Percentage			4.60%
Related Party Transaction, Purchases from Related Party			$ 32,000	$ 65,000
Revenue from Related Parties			423,000	$ 183,000
Accounts Receivable, Related Parties, Current			429,000		$ 145,000
Accounts Payable, Related Parties, Current			0		23,000
Licensing Agreement [Member]
NOTE G - INVESTMENT IN MORION, INC. (Details) [Line Items]
Revenue from Related Parties					$ 925,000
Long-term Purchase Commitment, Description	The agreement required the Company to sell certain fully-depreciated production equipment previously owned by the Company and to provide training to Morion employees to enable Morion to produce a minimum of 5,000 rubidium oscillators per year.
License And Equipment Fee Receivable	$ 2,700,000
Percentage Of Royalties Payable On Third Party Sales	5.00%
Long-term Purchase Commitment, Period	5 years
Purchase Commitment, Remaining Minimum Amount Committed	$ 400,000
Proceeds from Deposits from Customers		$ 925,000
Product and Training Services [Member]
NOTE G - INVESTMENT IN MORION, INC. (Details) [Line Items]
Revenue from Related Parties			375,000
Balance for Transfer of License Due Once State Department Approves Removal of Certain Provisions [Member]
NOTE G - INVESTMENT IN MORION, INC. (Details) [Line Items]
License And Equipment Fee Receivable			$ 1,000,000