Significant Accounting Policies (Tables)

3 Months Ended

Aug. 31, 2012

Schedule of Inventory, Current [Table Text Block]

	August 31,		May 31,
	2012		2012
Raw materials	$	823,921	$	896,488
Work in progress		733,143		553,236
Finished products		263,685		371,348
Total	$	1,820,749	$	1,821,072

Schedule of Share-based Compensation, Activity [Table Text Block]

	Number of Options and Warrants			Weighted Average Exercise Price
	Employee	Non-employee	Total
Outstanding May 31, 2012	1,004,500	-	1,004,500	$	0.46
Granted	-	-	-		-
Exercised	-	-	-		-
Cancelled or expired	(8,000)	-	(8,000)		0.41
Outstanding August 31, 2012	996,500	-	996,500	$	0.46

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Three Months Ended
	August 31,
	2012		2011
Numerator:
Income from continuing operations	$	291,640	$	117,792
Denominator for basic net income per common share		6,952,339		6,868,339
Effect of dilutive securities:
Options and warrants		350,795		35,014
Denominator for diluted net income per common share		7,303,134		6,903,353
Basic net income per common share	$	0.04	$	0.02
Diluted net income per common share	$	0.04	$	0.02