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Significant Accounting Policies (Tables)

9 Months Ended

Feb. 28, 2018

Accounting Policies [Abstract]

Schedule of Inventory, Current [Table Text Block]

	February 28, 2018			May 31, 2017
Raw materials			$			892,000		$	830,000
Work in progress		891,000			728,000
Finished products		171,000			171,000
Total	$	1,954,000		$	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
Granted	287,000				$	3.63
Exercised	(24,125)		$	0.78
Cancelled or expired	(10,625)		$	1.44
Outstanding February 28, 2018	1,149,250		$	1.64

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

	Nine Months Ended February 28,						Three Months Ended February 28,
						2018							2017			2018			2017
Numerator:
Net loss	$	(798,211)		$	(562,741)		$	(322,491)		$	(304,141)
Denominator for basic loss   per common share		8,529,009			8,269,791			8,556,480			8,433,932
Effect of dilutive securities:
Options and warrants		--			--			--			--
Denominator for diluted loss   per common share		8,529,009			8,269,791			8,556,480			8,433,932
Basic net loss per common share	$	(0.09)		$	(0.07)		$	(0.04)		$	(0.04)
Diluted net loss per common share	$	(0.09)		$	(0.07)		$	(0.04)		$	(0.04)

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