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Significant Accounting Policies (Tables)

6 Months Ended

Nov. 30, 2012

Schedule of Inventory, Current [Table Text Block]

		November 30, 2012		May 31, 2012
Raw materials	$	913,267	$	896,488
Work in progress		571,488		553,236
Finished products		315,349		371,348
Total	$	1,800,104	$	1,821,072

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

	Number of Options and Warrants
	Employee		Non-employee		Total		Weighted Average Exercise Price
Outstanding May 31,2012	1,004,500		--		1,004,500	$	0.46
Granted	30,000		--		30,000		0.67
Exercised	(20,000)		--		(20,000)		0.30
Cancelled or expired	(11,000)		--		(11,000)		0.41
Outstanding November 30, 2012	1,003,500		--		1,003,500	$	0.47

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

		Six Months Ended				Three Months Ended
		November 30,				November 30,
		2012		2011		2012		2011
Numerator:
Income from continuing operations		528,550		312,884		236,919		195,092
Denominator for basic net income per common share		6,959,224		6,868,339		6,966,185		6,868,339
Effect of dilutive securities:
Options and warrants		322,978		40,041		418,954		51,957
Denominator for diluted net income per common share		7,282,202		6,908,380		7,385,139		6,920,296
Basic net income per common share	$	0.08	$	0.05	$	0.03	$	0.03
Diluted net income per common share	$	0.07	$	0.05	$	0.03	$	0.03

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- Definition

Tabular disclosure of an entity's basic and diluted earnings per share calculations.

+ 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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