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Note 7 - Stockholders' Equity and Stock Incentive Plans - Share Repurchases (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Shares repurchased (1) (in shares) [1] 0 245 683 1,075
Total cost, including brokerage fees $ 0 $ 6,107 $ 11,121 $ 27,760
Average repurchase price per share (2) (in dollars per share) [2] $ 0 $ 24.90 $ 16.29 $ 25.82
[1] All shares repurchased have been retired and constitute authorized but unissued shares.
[2] Amounts in the table may not recalculate exactly due to rounding. Average repurchase price per share is calculated based on unrounded numbers.