CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($)	Nov. 30, 2016	May 31, 2016
Allowance for doubtful accounts (in Dollars)	$ 30,326	$ 8,405
Accumulated depreciation and amortization (in Dollars)	$ 1,479,082	$ 1,423,900
Preferred Stock, No Par Value (in Dollars per share)	$ 0	$ 0
Preferred Stock, shares authorized	5,000,000	5,000,000
Preferred Stock, shares issued	0	0
Preferred Stock, shares outstanding	0	0
Common stock par value (in Dollars per share)	$ 0.08	$ 0.08
Common stock, shares authorized	25,000,000	25,000,000
Common stock, shares issued	8,300,548	8,169,673
Common stock, shares outstanding	8,300,548	8,169,673