Statements of Operations (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019
Income Statement [Abstract]
Net Sales	$ 291,454	$ 372,500	$ 920,539	$ 1,018,788
Cost of Sales	111,362	110,513	327,090	322,312
Gross Profit	180,092	262,017	593,449	696,476
Operating Expenses
Marketing	45,751	45,951	137,318	139,924
General and administrative	91,055	98,883	299,249	313,838
Research and development	45,935	43,168	125,032	119,000
Total Operating Expenses	182,741	188,002	561,599	572,762
Income from Operations	(2,649)	74,015	31,850	123,714
Other Income
Interest income	149	150	449	375
Other income	480	480	1,440	1,440
Total Other Income	629	630	1,889	1,815
Net income before income taxes	(2,020)	74,645	33,739	125,529
Provision for income taxes		21,281	10,191	35,788
Net Income (Loss)	$ (2,020)	$ 53,364	$ 23,548	$ 89,741
Net income per common share-basic and diluted	$ 0.000	$ 0.004	$ 0.002	$ 0.006
Weighted-Average common stock outstanding-basic and diluted	14,935,511	14,935,511	14,935,511	14,935,511