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Note 13 - Employee and Postretirement Benefit Plans - Non-vested Stock Options and Restricted Stock Activity (Details) - Restricted Stock [Member]
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Outstanding, restricted shares, beginning of year (in shares) | shares 60,757
Outstanding, weighted average grant date fair value (in dollars per share) | $ / shares $ 23.17
Granted, restricted shares (in shares) | shares 34,552
Granted, weighted average grant date fair value (in dollars per share) | $ / shares $ 24.21
Vested, restricted shares (in shares) | shares (27,025)
Vested, weighted average grant date fair value (in dollars per share) | $ / shares $ 23
Forfeited, restricted shares (in shares) | shares (7,939)
Forfeited, weighted average grant date fair value (in dollars per share) | $ / shares $ 23.39
Outstanding, restricted shares, end of year (in shares) | shares 60,345
Outstanding, weighted average grant date fair value (in dollars per share) | $ / shares $ 23.81