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Significant Accounting Policies (Tables)

9 Months Ended

Feb. 29, 2016

Accounting Policies [Abstract]

Schedule of Inventory, Current [Table Text Block]

	February 29, 2016			May 31, 2015
Raw materials			$			1,061,000		$	958,000
Work in progress		791,000			831,000
Finished products		248,000			238,000
Total	$	2,100,000		$	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
Granted	70,000					1.04
Exercised	(92,625)			0.41
Cancelled or expired	(21,375)			0.70
Outstanding  February 29, 2016	1,104,000		$	0.64

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

	Nine Months Ended						Three Months Ended
						February 29, 2016							February 28, 2015			February 29, 2016			February 28, 2015
Numerator:
Net loss	$	(274,105)		$	(574,483)		$	(135,002)		$	(117,193)
Denominator for basic net loss Per common share		7,595,273			7,551,447			7,617,272			7,554,603
Effect of dilutive securities:
Options and warrants		--			--			--			--
Denominator for diluted net loss per common share		7,595,273			7,551,447			7,617,272			7,554,603
Basic net loss per common share	$	(0.04)		$	(0.08)		$	(0.02)		$	(0.02)
Diluted net loss per common share	$	(0.04)		$	(0.08)		$	(0.02)		$	(0.02)

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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.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
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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.

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