CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) (USD $)	Nov. 30, 2013	May 31, 2013
Allowance for doubtful accounts (in Dollars)	$ 120,405	$ 115,730
Accumulated depreciation and amortization (in Dollars)	$ 1,118,240	$ 1,032,009
Preferred stock, Shares authorized (in Shares)	5,000,000	5,000,000
Preferred stock, Shares Issued (in Shares)	0	0
Preferred stock, Shares Outstanding (in Shares)	0	0
Preferred stock, No Par Value (in Dollars per share)
Common stock, Par Value (in Dollars per share)	$ 0.08	$ 0.08
Common stock, Shares Authorized (in Shares)	25,000,000	25,000,000
Common stock, Shares Issued (in Shares)	7,279,214	7,274,714
Common stock, Shares Outstanding (in Shares)	7,279,214	7,274,714