Note 13 - Share-Based Compensation (Detail) - Stock Option Activity (USD $)	9 Months Ended
	Feb. 28, 2013
Stock Options [Member]
Outstanding at May 31, 2012	139,779
Outstanding at May 31, 2012 (in Dollars per share)	$ 100.00
Granted	20,000
Granted (in Dollars per share)	$ 100.00
Exercised	0
Exercised (in Dollars per share)	$ 0
Forfeited	(6,800)
Forfeited (in Dollars per share)	$ 100.00
Expired	(1,700)
Expired (in Dollars per share)	$ 100.00
Outstanding at February 28, 2013	151,279
Outstanding at February 28, 2013 (in Dollars per share)	$ 100.00
Performance Based Options [Member]
Outstanding at May 31, 2012	135,779
Outstanding at May 31, 2012 (in Dollars per share)	$ 100.00
Granted	20,000
Granted (in Dollars per share)	$ 100.00
Exercised	0
Exercised (in Dollars per share)	$ 0
Forfeited	(8,500)
Forfeited (in Dollars per share)	$ 100.00
Expired	0
Expired (in Dollars per share)	$ 0
Outstanding at February 28, 2013	147,279
Outstanding at February 28, 2013 (in Dollars per share)	$ 100.00