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Note 14 - Stock-based Compensation - Restricted Stock (Details) - Restricted Stock [Member] - $ / shares
shares in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Unvested (in shares) 110 119
Unvested, grant date weighted average cost (in dollars per share) $ 32.09 $ 27.62
Awarded (in shares) 39 40
Shares awarded, grant date weighted average cost (in dollars per share) $ 34.88 $ 35.89
Restrictions lapsed and shares released (in shares) (39) (44)
Restrictions lapsed and shares released, grant date weighted average cost (in dollars per share) $ 28.66 $ 23.62
Forfeited (in shares) (5)
Shares forfeited, grant date weighted average cost (in dollars per share) $ 31.35
Unvested (in shares) 110 110
Unvested, grant date weighted average cost (in dollars per share) $ 34.31 $ 32.09