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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Weighted average anti-dilutive options (in shares) 753 662 420 695