Balance Sheets (Unaudited) - USD ($)	Jan. 31, 2020	Apr. 30, 2019
Current assets
Cash	$ 1,246,516	$ 1,180,125
Accounts receivable, trade (Net of allowance for doubtful accounts of $500 at January 31, 2020 and April 30, 2019)	218,439	246,363
Inventories	146,112	162,678
Prepaid expenses	57,271	57,658
Total current assets	1,668,338	1,646,824
Property, Plant and Equipment
Equipment	200,590	201,489
Leasehold improvements	25,809	25,809
(Property Plant and Equipment Gross)	226,399	227,298
Less accumulated depreciation and amortization	(217,419)	(214,982)
Total property, plant and equipment	8,980	12,316
Operating Lease Right of Use Asset	22,275	89,100
Total Operating Lease Right of Use Asset	22,275	89,100
Other assets
Patents less accumulated amortization	108,470	118,702
Deposits	5,937	5,937
Total other assets	114,407	124,639
Total Assets	1,814,000	1,872,879
Current Liabilities
Accounts payable	4,206	4,538
Accrued compensation and payroll taxes	24,991	39,766
Accrued vacation	21,031	21,578
Other accrued liabilities	1,086	209
Operating lease liability	22,550	90,200
Total current liabilities	73,864	156,291
Deferred income taxes	24,272	24,272
Shareholders equity
Common stock, no par value: 20,000,000 authorized shares issued: 14,935,511 shares outstanding at January 31, 2020 and April 30, 2019	660,988	660,988
Receivable from Affiliate	(19,699)	(19,699)
Retained earnings	1,074,575	1,051,027
Total Shareholders Equity	1,715,864	1,692,316
[LiabilitiesAndStockholdersEquity]	$ 1,814,000	$ 1,872,879