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Significant Accounting Policies (Tables)

3 Months Ended

Aug. 31, 2018

Accounting Policies [Abstract]

Schedule of Inventory, Current [Table Text Block]

	August 31, 2018			May 31, 2018
Raw materials			$			989,000		$	1,000,000
Work in progress		923,000			854,000
Finished products		296,000			325,000
Total	$	2,208,000		$	2,179,000

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

			Exercise Price Weighted Average
	Option Shares
Outstanding May 31, 2018					1,138,625		$	1.65
Granted	--					--
Forfeited	(3,500)			0.99
Exercised	(21,500)			0.83
Outstanding August 31, 2018	1,113,625		$	1.67

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

	Three Months Ended August 31,
						2018			2017
Numerator
Loss from continuing operations	$	(451,740)		$	(207,059)
Denominator for basic net loss Per common share		8,930,251			8,511,260
Effect of dilutive securities:
Options		--			--
Denominator for diluted net loss    per common share		8,930,251			8,511,260
Basic net loss per common share	$	(0.05)		$	(0.02)
Diluted net loss per common share	$	(0.05)		$	(0.02)

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