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Significant Accounting Policies (Tables)

6 Months Ended

Nov. 30, 2018

Accounting Policies [Abstract]

Schedule of Inventory, Current [Table Text Block]

	November 30, 2018			May 31, 2018
Raw materials			$			1,071,000		$	1,000,000
Work in progress		791,000			854,000
Finished products		253,000			325,000
Total	$	2,115,000		$	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
Exercised	(98,500)					0.77
Cancelled or expired	(23,500)			2.56
Granted	139,000			3.62
Outstanding November 30, 2018	1,155,625		$	1.94

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

	Six Months Ended November 30,						Three Months Ended     November 30,
						2018							2017			2018			2017
Numerator:
Loss from continuing operations	$	(928,984)		$	(475,720)		$	(477,244)		$	(268,661)
Denominator for basic loss    Per common share		8,995,575			8,515,499			9,061,617			8,519,784
Effect of dilutive securities:
Options		-			-			-			-
Denominator for diluted loss   per common share		8,995,575			8,515,499			9,061,617			8,519,784
Basic loss per common share	$	(0.10)		$	(0.06)		$	(0.05)		$	(0.03)
Diluted loss per common share	$	(0.10)		$	(0.06)		$	(0.05)		$	(0.03)

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