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Note 6 - Net Income Per Share - Antidilutive Securities (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Employee Stock Option [Member]        
Antidilutive securities (in shares) 230 58 264 52
Restricted Stock Units RSU Nonvested [Member]        
Antidilutive securities (in shares) 348 62 798 64
Employee Stock Purchase Plan [Member]        
Antidilutive securities (in shares) 215 230 239
Antidilutive securities (in shares) 578 335 1,292 355