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Note 16 - Employee Benefit Plans - Performance Stock Units (Details) - Performance Shares [Member] - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Balance of shares non-vested (in shares) 55,823 0
Balance of shares non-vested, weighted average grant-date price (in dollars per share) $ 20.48 $ 0
Granted (in shares) 0 55,823
Granted (in dollars per share) $ 20.48
Vested (in shares) 0 0
Vested, weighted average grant-date price (in dollars per share) $ 0
Forfeited (in shares) (8,501) 0
Forfeited, weighted average grant-date price (in dollars per share) $ 20.48 $ 0
Balance of shares non-vested (in shares) 47,322 55,823
Balance of shares non-vested, weighted average grant-date price (in dollars per share) $ 20.48 $ 20.48