CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($)	Nov. 30, 2015	May. 31, 2015
Allowance for doubtful accounts (in Dollars)	$ 8,815	$ 17,468
Accumulated Depreciation and Amortization (in Dollars)	$ 1,346,477	$ 1,267,617
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	7,590,237	7,566,714
Common stock, shares outstanding	7,590,237	7,566,714