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Note 6 - Share-based Compensation - Performance Share Transactions (Details) - Performance Shares [Member]
9 Months Ended
Sep. 30, 2019
$ / shares
shares
Outstanding (in shares) | shares 194,378
Outstanding, weighted average grant date fair value (in dollars per share) | $ / shares $ 20.08
Granted (in shares) | shares 14,068
Granted, weighted average grant date fair value (in dollars per share) | $ / shares $ 17.77
Vested (in shares) | shares
Vested, weighted average grant date fair value (in dollars per share) | $ / shares
Cancelled (in shares) | shares (14,434)
Cancelled, weighted average grant date fair value (in dollars per share) | $ / shares $ 22.03
Outstanding (in shares) | shares 194,012
Outstanding, weighted average grant date fair value (in dollars per share) | $ / shares $ 19.77