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Significant Accounting Policies (Tables)

9 Months Ended

Feb. 28, 2017

Accounting Policies [Abstract]

Schedule of Inventory, Current [Table Text Block]

	February 28,  2017			May 31, 2016
Raw materials			$			903,000		$	942,000
Work in progress		772,000			690,000
Finished products		143,000			231,000
Total	$	1,818,000		$	1,863,000

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

			Exercise Price Weighted Average
	Option Shares
Outstanding May 31, 2016					1,199,000		$	0.81
Granted	55,000					1.55
Exercised	(335,500)			0.46
Cancelled or expired	(11,500)			0.97
Outstanding February 28, 2017	907,000		$	0.98

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

	Nine Months Ended						Three Months Ended
						February 28, 2017							February 29, 2016			February 28, 2017			February 29, 2016
Numerator:
Net loss	$	(562,741)		$	(274,105)		$	(304,141)		$	(135,002)
Denominator for basic loss  per common share		8,269,791			7,595,273			8,433,932			7,617,272
Effect of dilutive securities:
Options and warrants		--			--			--			--
Denominator for diluted loss  per common share		8,269,791			7,595,273			8,433,932			7,617,272
Basic net loss per common share	$	(0.07)		$	(0.04)		$	(0.04)		$	(0.02)
Diluted net loss per common share	$	(0.07)		$	(0.04)		$	(0.04)		$	(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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
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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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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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