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Note 13 - Employee Benefit Plans - Stock Option Activity (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Options outstanding at beginning of period (in shares) | shares 200,704
Options outstanding at beginning of period (in dollars per share) | $ / shares $ 20.14
Granted (in shares) | shares 0
Granted (in dollars per share) | $ / shares
Exercised (in shares) | shares (24,186)
Exercised (in dollars per share) | $ / shares $ 15.89
Canceled (in shares) | shares (20,263)
Canceled (in dollars per share) | $ / shares $ 19.72
Options outstanding at end of period (in shares) | shares 156,255
Options outstanding at end of period (in dollars per share) | $ / shares $ 20.85
Options outstanding at end of period (Year) 5 years 219 days
Options outstanding at end of period | $ $ 1,662
Options exercisable at end of period (in shares) | shares 103,090
Options exercisable at end of period (in dollars per share) | $ / shares $ 20.23
Options exercisable at end of period (Year) 4 years 219 days
Options exercisable at end of period | $ $ 1,160