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Note 7 - Earnings Per Share ("EPS") (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
2 Months Ended 3 Months Ended 6 Months Ended
May 08, 2019
May 07, 2019
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
May 02, 2019
Stock Repurchase Program, Authorized Amount               $ 50,000
Payments for Repurchase of Common Stock           $ 30,000 $ 30,000  
Accelerated Stock Repurchase [Member]                
Stock Repurchase Program, Authorized Amount   $ 30,000           30,000
Payments for Repurchase of Common Stock   $ 30,000            
Stock Repurchased During Period, Shares 0.5              
Share Price $ 39.85              
Share Repurchased, Pecentage 60.00%              
Stock Repurchase Program, Remaining Authorized Repurchase Amount     $ 12,000 $ 12,000   $ 12,000    
Number of Additional Shares Deliver to Company if ASR Agreement Settled     0.3          
Repurchase from Open Market [Member]                
Stock Repurchase Program, Authorized Amount               $ 20,000
Share-based Payment Arrangement, Option [Member]                
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount       1.0 0.7 1.0 0.6