Condensed Statement of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Jan. 31, 2019	Jan. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 2,559,000	$ 2,032,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	248,000	163,000
(Gain) loss on sale of investments	(142,000)	(117,000)
Impairments on investments	68,000	23,000
Reserve for bad debts	(3,000)	13,000
Reserve for obsolete inventory	12,000
Deferred income taxes	33,000	1,000
(Gain) loss on sale of assets		(4,000)
(Increase) decrease in:
Accounts receivable	514,000	(636,000)
Inventories	(999,000)	(1,291,000)
Prepaid expenses	164,000	(359,000)
Other receivables	(2,000)	2,000
Income tax overpayment	(106,000)	(221,000)
Increase (decrease) in:
Accounts payable	(35,000)	239,000
Accrued expenses	(36,000)	(127,000)
Net cash provided by (used in) operating activities	2,275,000	(282,000)
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sale of assets		4,000
(Purchase) of property and equipment	(88,000)	(342,000)
Proceeds from sale of marketable securities	761,000	2,013,000
(Purchase) of marketable securities	(839,000)	(653,000)
(Purchase) of intangible assets		(1,624,000)
Net cash provided by (used in) investing activities	(166,000)	(602,000)
CASH FLOWS FROM FINANCING ACTIVITIES:
(Purchase) of treasury stock	(62,000)	(3,000)
Dividends paid	(1,752,000)	(1,617,000)
Net cash provided by (used in) financing activities	(1,814,000)	(1,620,000)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	295,000	(2,504,000)
Cash and Cash Equivalents, beginning of period	4,294,000	6,456,000
Cash and Cash Equivalents, end of period	4,589,000	3,952,000
Supplemental Disclosure for Cash Flow Information:
Income taxes	900,000	1,320,000
Interest paid	1,000
Cash receipts for:
Income taxes		253,000
Supplemental Disclosure of Noncash Investing and Financing Activities:
Issuance of treasury stock as part of asset acquisition		$ 200,000