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Significant Accounting Policies (Tables)

3 Months Ended

Aug. 31, 2019

Accounting Policies [Abstract]

Schedule of Inventory, Current [Table Text Block]

	August 31, 2019			May 31, 2019
Raw materials			$			1,217,000		$	1,208,000
Work in progress		831,000			771,000
Finished products		158,000			172,000
Total	$	2,206,000		$	2,151,000

Share-based Payment Arrangement, Option, Activity [Table Text Block]

			Exercise Price Weighted Average
	Option Shares
Outstanding May 31, 2019					1,476,209		$	2.07
Granted	--					--
Forfeited	(18,000)			3.41
Exercised	(41,625)			0.83
Outstanding August 31, 2019	1,416,584		$	2.09

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

	Three Months Ended August 31,
						2019			2018
Numerator
Loss from continuing operations	$	(506,296)		$	(451,740)
Denominator for basic net loss per common share		9,744,461			8,930,251
Effect of dilutive securities:
Options		--			--
Denominator for diluted net loss    per common share		9,744,461			8,930,251
Basic net loss per common share	$	(0.05)		$	(0.05)
Diluted net loss per common share	$	(0.05)		$	(0.05)

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