CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) (USD $)	May 31, 2013	May 31, 2012
Allowance for doubtful accounts (in Dollars)	$ 115,730	$ 113,191
Preferred Stock, Par Value Per Share (in Dollars per share)
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
Common Stock, Par Value Per Share (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)	7,274,714	6,952,339
Common Stock, Shares Outstanding (in Shares)	7,274,714	6,952,339