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Significant Accounting Policies (Tables)

6 Months Ended

Nov. 30, 2015

Accounting Policies [Abstract]

Schedule of Inventory, Current [Table Text Block]

	November 30, 2015			May 31, 2015
Raw materials			$			1,071,000		$	958,000
Work in progress		842,000			831,000
Finished products		324,000			238,000
Total	$	2,237,000		$	2,027,000

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

			Exercise Price Weighted Average
	Option Shares
Outstanding May 31, 2015		1,148,000				$	0.60
Exercised	(23,523)					0.44
Cancelled or expired	(21,375)			0.70
Outstanding  November 30, 2015	1,103,102		$	0.58

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

	Six Months Ended November 30,						Three Months Ended November 30,
						2015							2014			2015			2014
Numerator:
Loss from continuing operations	$	(139,103)		$	(457,296)		$	(66,768)		$	(238,028)
Denominator for basic net loss Per common share		7,584,333			7,549,894			7,586,635			7,551,972
Effect of dilutive securities:
Options		--			--			--			--
Denominator for diluted net loss per common share		7,584,333			7,549,894			7,586,635			7,551,972
Basic net loss per common share	$	(0.02)		$	(0.06)		$	(0.01)		$	(0.03)
Diluted net loss per common share	$	(0.02)		$	(0.06)		$	(0.01)		$	(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 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
-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)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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