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Note 12 - Earnings Per Share (Details Textual) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 271,507 448,298 322,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Weight Average Exercise Price (in dollars per share) $ 19.77 $ 19.73 $ 22.02