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Significant Accounting Policies (Tables)

9 Months Ended

Feb. 28, 2014

Accounting Policies [Abstract]

Schedule of Inventory, Current [Table Text Block]

	February 28, 2014			May 31, 2013
Raw materials			$			885,000		$	787,000
Work in progress		758,000			555,000
Finished products		295,000			229,000
Total	$	1,938,000		$	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	(39,000)			0.44
Cancelled or expired	(10,000)			0.43
Outstanding February 28, 2014	849,500		$	0.50

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

	Nine Months Ended February 28,						Three Months Ended February 28,
						2014							2013			2014			2013
Numerator:
(Loss)income from continuing operations	$	(384,532)		$	492,937		$	26,544		$	(35,614)
Denominator for basic net (loss) income Per common share		7,310,872			6,972,224			7,378,403			7,000,011
Effect of dilutive securities:
Options and warrants		-			438,246			352,849			-
Denominator for diluted net (loss)income per common share		7,310,872			7,410,470			7,731,252			7,000,011
Basic net (loss) income per common share	$	(0.05)		$	0.07		$	0.00		$	(0.01)
Diluted net (loss) income per common share	$	(0.05)		$	0.07		$	0.00		$	(0.01)

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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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