Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Apr. 30, 2012	Apr. 30, 2011
Sales	$ 23,104	$ 23,554
Cost of products sold	14,709	15,674
Gross margin	8,395	7,880
Selling, general and administrative expenses:
Research and development expense	1,438	1,366
Selling and marketing expense	2,143	1,414
General and administrative expense	2,694	3,469
Total selling, general and administrative expenses	6,275	6,249
Operating income	2,120	1,631
Financial income (expense):
Interest expense	(152)	(288)
Other expense, net	(3)	(8)
	(155)	(296)
Net income before income tax expense	1,965	1,335
Income tax expense	746	463
Net income	$ 1,219	$ 872
Net income per share information:
Basic (in Dollars per share)	$ 0.32	$ 0.23
Diluted (in Dollars per share)	$ 0.32	$ 0.22
Weighted average common shares outstanding:
Basic (in Shares)	3,796	3,789
Diluted (in Shares)	3,844	3,900