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Note 5 - Share-Based Compensation - Restricted Stock Unit Activity (Details) - Restricted Stock Units (RSUs) [Member]
3 Months Ended
Mar. 31, 2019
$ / shares
shares
Outstanding, restricted stock units (in shares) | shares 72,176
Outstanding, weighted average award date fair value (in dollars per share) | $ / shares $ 23.60
Awarded, restricted stock units (in shares) | shares 61,710
Awarded, weighted average award date fair value (in dollars per share) | $ / shares $ 33.05
Shares vested, restricted stock units (in shares) | shares (19,860)
Shares vested, weighted average award date fair value (in dollars per share) | $ / shares $ 23.53
Outstanding, restricted stock units (in shares) | shares 114,026
Outstanding, weighted average award date fair value (in dollars per share) | $ / shares $ 26.12