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Note 14 - Net Income Per Share - Anti-dilutive Net Income Per Share (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Antidilutive securities (in shares) 595 584 512
Share-based Payment Arrangement, Option [Member]      
Antidilutive securities (in shares) 534 532 460
Restricted Stock Units (RSUs) [Member]      
Antidilutive securities (in shares) 61 52 52