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Note 13 - Share-Based Compensation (Detail) - Restricted Stock Activity (USD $)
1 Months Ended 9 Months Ended
Jun. 30, 2011
Feb. 28, 2013
Restricted Stock [Member]
Feb. 28, 2013
Stock Appreciation Rights (SARs) [Member]
Stock outstanding at May 31, 2012   2,100 87,000
Stock outstanding at May 31, 2012 (in Dollars per share)   $ 78.64 $ 20.59
Granted   1,600 38,900
Granted (in Dollars per share) $ 19.85 $ 78.64 $ 20.59
Vested   0 0
Vested (in Dollars per share)   $ 0 $ 0
Forfeited   0 (9,200)
Forfeited (in Dollars per share)   $ 0 $ 20.59
Cancelled/Expired     (5,000)
Cancelled/Expired (in Dollars per share)     $ 20.59
Outstanding at February 28, 2013   3,700 111,700
Outstanding at February 28, 2013 (in Dollars per share)   $ 78.64 $ 20.59