Statements of Cash Flows - USD ($)	12 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Cash Flows From Operating Activities:
Net Income	$ 2,401,000	$ 3,086,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	187,000	182,000
(Gain) loss on sale of investments	(180,000)	(141,000)
Impairment on investments	220,000	69,000
Bad debt expense	2,000	(2,000)
Reserve for obsolete inventory	1,000	6,000
Deferred income taxes	(13,000)	(21,000)
(Increase) decrease in:
Accounts receivable	62,000	98,000
Inventories	660,000	(695,000)
Prepaid expenses	(124,000)	40,000
Employee receivables	(3,000)	2,000
Income tax overpayment	(55,000)	335,000
Increase (decrease) in:
Accounts payable	38,000	(79,000)
Accrued expense	(12,000)	14,000
Net cash provided by (used in) operating activities	3,184,000	2,894,000
Cash Flows From Investing Activities:
(Purchase) of property and equipment	(115,000)	(288,000)
Proceeds from sale of marketable securities	587,000	64,000
(Purchase) of marketable securities	(947,000)	(864,000)
(Purchase) of long-term investment	(20,000)
Collections of loans to employees		1,000
Net cash provided by (used in) investing activities	(495,000)	(1,087,000)
Cash Flows From Financing Activities:
(Purchase) of treasury stock	(555,000)	(27,000)
Dividends paid	(1,596,000)	(1,553,000)
Net cash provided by (used in) financing activities	(2,151,000)	(1,580,000)
Net Increase (Decrease) in Cash and Cash Equivalents	538,000	227,000
Cash and Cash Equivalents, beginning of period	5,918,000	5,691,000
Cash and Cash Equivalents, end of period	6,456,000	5,918,000
Supplemental Disclosure for Cash Flow Information:
Income taxes paid	1,412,000	1,380,000
Interest expense
Cash receipts for:
Income taxes	$ 185,000	$ 447,000