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Note 5 - Earnings Per Share ("EPS") (Details Textual) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
6 Months Ended 12 Months Ended
Aug. 31, 2016
Feb. 29, 2016
Feb. 26, 2016
Aug. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Aug. 26, 2016
Payments for Repurchase of Common Stock         $ 25,000  
Common Stock [Member]                
Stock Repurchased and Retired During Period, Shares             134  
Accelerated Stock Repurchase [Member] | Morgan Stanley & Co., LLC [Member]                
Payments for Repurchase of Common Stock     $ 25,000          
Stock Repurchased and Retired During Period, Shares 100 400   500        
Accelerated Stock Repurchase [Member] | Morgan Stanley & Co., LLC [Member] | Common Stock [Member]                
Stock Repurchase Program, Authorized Amount     $ 25,000          
Accelerated Share Repurchases, Initial Price Paid Per Share   $ 46.40            
Accelerated Share Repurchases, Settlement (Payment) or Receipt               $ 7,500
Accelerated Share Repurchases, Final Price Paid Per Share       $ 47.08        
Employee Stock Option [Member]                
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount         400 200 100  
Restricted Stock [Member]                
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount         100 100 30