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Note 12 - Employee Benefits - Option Activity (Details)
 12 Months Ended
Dec. 31, 2017
$ / shares
shares
Balance (in shares) | shares 922,934
Balance (in dollars per share) | $ / shares $ 10.94
Granted (in shares) | shares 136,501
Granted (in dollars per share) | $ / shares $ 16.32
Exercised (in shares) | shares (124,016)
Exercised (in dollars per share) | $ / shares $ 8.83
Forfeited (in shares) | shares (16,836)
Forfeited (in dollars per share) | $ / shares $ 11.43
Balance (in shares) | shares 918,583
Balance (in dollars per share) | $ / shares $ 12.02
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | shares 505,355
Exercisable at December 31, 2017 (in dollars per share) | $ / shares $ 10.42