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Significant Accounting Policies (Tables)

9 Months Ended

Feb. 28, 2013

Schedule of Inventory, Current [Table Text Block]

	February 28,			May 31,
	2013			2012
Raw materials	$	857,770		$	896,488
Work in progress		568,431			553,236
Finished products		279,037			371,348
Total	$	1,705,238		$	1,821,072

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

								Weighted
								Average
		Number of Options and Warrants						Exercise
		Employee		Non-employee		Total		Price
Outstanding May 31, 2012		1,004,500		--		1,004,500		$	0.46
Granted		30,000		--		30,000			0.67
Exercised		(97,875)		--		(97,875)			0.41
Cancelled or expired		(26,000)		--		(26,000)			0.42
Outstanding February 28, 2013		910,625		--		910,625		$	0.48

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

	Nine Months						Three Months
	Ended						Ended
		February 28			February 29,			February 28			February 29,
		2013			2012			2013			2012
Numerator:
Income (loss) from continuing operations		$	492,937		$	494,329		$	(35,614)		$	181,445
Denominator for basic net income (loss) per common share			6,972,671			6,871,532			7,000,011			6,877,954
Effect of dilutive securities:
Options and warrants			438,246			174,926			--			247,606
Denominator for diluted net income(loss) per common share			7,410,917			7,046,458			7,000,011			7,125,560
Basic net income (loss) per common share		$	0.07		$	0.07		$	(0.01)		$	0.03
Diluted net income (loss) per common share		$	0.07		$	0.07		$	(0.01)		$	0.03

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- Definition

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+ References

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- Definition

Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 2

-Paragraph 6

-Subparagraph a,b,c

-Article 5

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