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Significant Accounting Policies (Tables)

6 Months Ended

Nov. 30, 2017

Accounting Policies [Abstract]

Schedule of Inventory, Current [Table Text Block]

	November 30, 2017			May 31, 2017
Raw materials			$			976,000		$	830,000
Work in progress		731,000			728,000
Finished products		120,000			171,000
Total	$	1,827,000		$	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
Exercised	(18,375)					0.75
Cancelled or expired	(4,625)			0.92
Granted	52,000			2.41
Outstanding November 30, 2017	926,000		$	1.07

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

	Six Months Ended November 30,						Three Months Ended November 30,
						2017							2016			2017			2016
Numerator:
Loss from continuing operations	$	(475,720)		$	(258,600)		$	(268,661)		$	(202,887)
Denominator for basic loss  Per common share		8,515,499			8,208,672			8,519,784			8,189,066
Effect of dilutive securities:
Options		--			--			--			--
Denominator for diluted loss                   per common share		8,515,499			8,208,672			8,519,784			8,189,066
Basic loss per common share	$	(0.06)		$	(0.03)		$	(0.03)		$	(0.02)
Diluted loss per common share	$	(0.06)		$	(0.03)		$	(0.03)		$	(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
-SubTopic 10
-Section 50
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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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