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Note 18 - Restricted Stock Activity (Details)
12 Months Ended
May 31, 2016
$ / shares
shares
Restricted Stock [Member]  
Nonvested restricted stock units outstanding (in shares) | shares 2,400
Nonvested restricted stock units outstanding (in dollars per share) | $ / shares $ 84.55
Granted (in shares) | shares 34,566
Granted (in dollars per share) | $ / shares $ 104.24
Vested (in shares) | shares (1,600)
Vested (in dollars per share) | $ / shares $ 86.28
Nonvested restricted stock units outstanding (in shares) | shares 35,366
Nonvested restricted stock units outstanding (in dollars per share) | $ / shares $ 103.73
Stock Appreciation Rights (SARs) [Member]  
Nonvested restricted stock units outstanding (in shares) | shares 167,000
Nonvested restricted stock units outstanding (in dollars per share) | $ / shares $ 1.98
Granted (in shares) | shares 3,000
Granted (in dollars per share) | $ / shares $ 1.98
Nonvested restricted stock units outstanding (in shares) | shares
Nonvested restricted stock units outstanding (in dollars per share) | $ / shares
Forfeited (in shares) | shares (2,600)
Forfeited (in dollars per share) | $ / shares $ 1.98
Cancelled/Expired (in shares) | shares (167,400)
Cancelled/Expired (in dollars per share) | $ / shares $ 1.98