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Note 13 - Employee Benefit Plans - Stock Option Activity (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Options outstanding at beginning of period (in shares) | shares 200,396
Options outstanding at beginning of period (in dollars per share) | $ / shares $ 19.73
Granted (in shares) | shares 22,849
Granted (in dollars per share) | $ / shares $ 24.72
Exercised (in shares) | shares (16,185)
Exercised (in dollars per share) | $ / shares $ 23.33
Canceled (in shares) | shares (6,356)
Canceled (in dollars per share) | $ / shares $ 15.83
Options outstanding at end of period (in shares) | shares 200,704
Options outstanding at end of period (in dollars per share) | $ / shares $ 20.14
Options outstanding at end of period (Year) 5 years 328 days
Options outstanding at end of period | $ $ 1,742
Options exercisable at end of period (in shares) | shares 145,536
Options exercisable at end of period (in dollars per share) | $ / shares $ 19.41
Options exercisable at end of period (Year) 4 years 328 days
Options exercisable at end of period | $ $ 1,373