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Note 4 - Earnings Per Share - Anti-dilutive Securities (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Weighted average anti-dilutive stock options (in shares) 626 2,506 379 2,149