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Significant Accounting Policies (Tables)

6 Months Ended

Nov. 30, 2013

Accounting Policies [Abstract]

Schedule of Inventory, Current [Table Text Block]

		November 30,			May 31,
		2013			2013
Raw materials		$	864,000		$	787,000
Work in progress			755,000			555,000
Finished products			281,000			229,000
Total		$	1,900,000		$	1,571,000

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

		Option Shares		Exercise Price Weighted Average
Outstanding May 31, 2013		846,500		$	0.47
Granted		52,000		$	0.84
Exercised		(4,500)		$	0.40
Cancelled or expired		(10,000)		$	0.43
Outstanding November 30, 2013		884,000		$	0.49

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

		Six Months Ended						Three Months Ended
		November 30,					November 30,
		2013			2012			2013			2012
Numerator:
(Loss)income from continuing operations		$	(411,072)		$	528,550		$	(243,357)		$	236,919
Denominator for basic net (loss) income    Per common share			7,277,659			6,959,224			7,278,967			6,966,185
Effect of dilutive securities:
Options and warrants			-			322,978			-			418,954
Denominator for diluted net (loss) income    per common share			7,277,659			7,282,202			7,278,967			7,385,139
Basic net (loss) income per common share		$	(0.06)		$	0.08		$	(0.03)		$	0.03
Diluted net (loss) income per common share		$	(0.06)		$	0.07		$	(0.03)		$	0.03

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- Definition

Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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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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Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)

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