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Significant Accounting Policies (Tables)

3 Months Ended

Aug. 31, 2017

Accounting Policies [Abstract]

Schedule of Inventory, Current [Table Text Block]

	August 31, 2017			May 31, 2017
Raw materials			$			864,000		$	830,000
Work in progress		824,000			728,000
Finished products		103,000			171,000
Total	$	1,791,000		$	1,729,000

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

			Exercise Price Weighted Average
	Option Shares
Outstanding May 31, 2017					897,000		$	0.98
Granted	52,000					2.41
Forfeited	(3,000)			1.04
Exercised	(1,000)			1.04
Outstanding August 31, 2017	945,000		$	1.06

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

	Three Months Ended August 31,
						2017			2016
Numerator
Loss from continuing operations	$	(207,059)		$	(55,417)
Denominator for basic net loss Per common share		8,511,260			8,169,673
Effect of dilutive securities:
Options		--			--
Denominator for diluted net loss per common share		8,511,260			8,169,673
Basic net loss per common share	$	(0.02)		$	(0.01)
Diluted net loss per common share	$	(0.02)		$	(0.01)

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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
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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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