Condensed Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Jul. 31, 2018	Jul. 31, 2017
Cash Flows from Operating Activities:
Net Income	$ 617,000	$ 518,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	83,000	41,000
(Gain) loss on sale of investments	68,000	38,000
Reserve for bad debts	3,000
Reserve for obsolete inventory	6,000
Deferred income taxes	37,000	7,000
(Gain) loss on sale of assets		(4,000)
(Increase) decrease in:
Accounts receivable	234,000	257,000
Inventories	(389,000)	(62,000)
Prepaid expenses	166,000	63,000
Employee receivables		1,000
Income tax overpayment	244,000	208,000
Increase (decrease) in:
Accounts payable	(7,000)	112,000
Accrued expenses	(172,000)	(163,000)
Net cash provided by (used in) operating activities	890,000	1,016,000
Cash Flows From Investing Activities:
Proceeds from sale of assets		4,000
(Purchase) of property and equipment		(253,000)
Proceeds from sale of marketable securities	2,000	2,000
(Purchase) of marketable securities	(233,000)	(224,000)
Net cash provided by (used in) investing activities	(231,000)	(471,000)
Cash Flows From Financing Activities:
(Purchase) of treasury stock	(5,000)	(3,000)
Dividends paid	(1,000)
Net cash provided by (used in) financing activities	(6,000)	(3,000)
Net Increase (Decrease) in Cash and Cash Equivalents	653,000	542,000
Cash and Cash Equivalents, beginning of period	4,294,000	6,456,000
Cash and Cash Equivalents, end of period	4,947,000	6,998,000
Supplemental Disclosure for Cash Flow Information:
Income taxes paid	0	0
Interest paid	$ 1,000	$ 0