Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
	Jan. 31, 2012	Jan. 31, 2011
Statement of Cash Flows [Abstract]
Net income	$ 95,704	$ 86,020
Depreciation and amortization	8,392	12,900
Changes in assets and liabilities
Accounts receivable	(6,446)	(7,825)
Inventories	(4,699)	41,398
Prepaid expenses	58	8,430
Interest receivable		11
Accounts payable and accrued expenses	(6,396)	28,777
Total Adjustments	(9,091)	83,691
Net cash provided by operating activities	86,613	169,711
Cash flow from investing activities
Patents and Patents Pending	(6,303)	(30,528)
Purchase of equipment	(4,214)	(7,495)
Redemption of Short-Term Investments		100,000
Net cash used in investing activities	(10,517)	61,977
Increase in cash and cash equivalents	76,096	231,688
Cash Beginning Period	667,897	426,569
Cash Ending Period	$ 743,993	$ 658,257