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Significant Accounting Policies (Tables)

6 Months Ended

Nov. 30, 2014

Accounting Policies [Abstract]

Schedule of Inventory, Current [Table Text Block]

	November 30, 2014			May 31, 2014
Raw materials			$			922,000		$	899,000
Work in progress		815,000			635,000
Finished products		253,000			232,000
Total	$	1,990,000		$	1,766,000

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

			Exercise Price Weighted Average
	Option Shares
Options Outstanding May 31, 2014		860,500				$	0.51
Granted	24,500				$	0.85
Exercised	(9,000)		$	0.39
Cancelled or expired	(34,500)		$	0.72
Options Outstanding November 30, 2014	841,500		$	0.52

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

	Six Months Ended November 30,						Three Months Ended November 30,
	2014			2013			2014			2013
Numerator:
Loss from continuing operations	$	(457,296)		$	(411,072)		$	(238,028)		$	(243,357)
Denominator for basic net loss Per common share		7,549,894			7,277,659			7,551,972			7,278,967
Effect of dilutive securities:
Options		--			--			--			--
Denominator for diluted net loss per common share		7,549,894			7,277,659			7,551,972			7,278,967
Basic net loss per common share	$	(0.06)		$	(0.06)		$	(0.03)		$	(0.03)
Diluted net loss per common share	$	(0.06)		$	(0.06)		$	(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

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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 FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 2

-Paragraph 6

-Subparagraph a,b,c

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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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