Condensed Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Jul. 31, 2019	Jul. 31, 2018
Cash Flows from Operating Activities:
Net Income	$ 866,000	$ 617,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	89,000	83,000
(Gain) loss on sale of investments	(83,000)	68,000
Impairments on investments	34,000
Reserve for bad debts	(2,000)	3,000
Reserve for obsolete inventory	8,000	6,000
Deferred income taxes	(7,000)	37,000
(Increase) decrease in:
Accounts receivable	163,000	234,000
Inventories	(288,000)	(389,000)
Prepaid expenses	79,000	166,000
Employee receivables	2,000
Income tax overpayment		244,000
Increase (decrease) in:
Accounts payable	55,000	(7,000)
Accrued expenses	(66,000)	(172,000)
Income tax payable	289,000
Net cash provided by operating activities	1,139,000	890,000
Cash Flows From Investing Activities:
(Purchase) of property and equipment	(169,000)
Proceeds from sale of marketable securities	9,000	2,000
(Purchase) of marketable securities	(132,000)	(233,000)
Net cash (used in) investing activities	(292,000)	(231,000)
Cash Flows From Financing Activities:
(Purchase) of treasury stock	(53,000)	(5,000)
Dividends paid		(1,000)
Net cash (used in) financing activities	(53,000)	(6,000)
Net Increase in Cash and Cash Equivalents	794,000	653,000
Cash and Cash Equivalents, beginning of period	4,873,000	4,294,000
Cash and Cash Equivalents, end of period	5,667,000	4,947,000
Supplemental Disclosure for Cash Flow Information:
Income taxes paid	0	0
Interest paid	$ 0	$ 1,000