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Significant Accounting Policies (Tables)

9 Months Ended

Feb. 28, 2019

Accounting Policies [Abstract]

Schedule of Inventory, Current [Table Text Block]

	February 28, 2019			May 31, 2018
Raw materials			$			1,036,000		$	1,000,000
Work in progress		832,000			854,000
Finished products		212,000			325,000
Total	$	2,080,000		$	2,179,000

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

			Exercise Price Weighted Average
	Option Shares
Outstanding May 31, 2018					1,138,625		$	1.65
Granted	524,000					2.61
Exercised	(109,500)			0.77
Cancelled or expired	(44,250)			2.12
Outstanding February 28, 2019	1,508,875		$	2.04

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

	Nine Months Ended February 28,						Three Months Ended    February 28,
						2019							2018			2019			2018
Numerator:
Net loss	$	(1,607,730)		$	(798,211)		$	(678,746)		$	(322,491)
Denominator for basic loss    per common share		9,103,225			8,529,009			9,322,549			8,556,480
Effect of dilutive securities:
Options and warrants		-			-			-			-
Denominator for diluted loss   per common share		9,103,225			8,529,009			9,322,549			8,556,480
Basic net loss per common share	$	(0.18)		$	(0.09)		$	(0.07)		$	(0.04)
Diluted net loss per common share	$	(0.18)		$	(0.09)		$	(0.07)		$	(0.04)

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