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Note 9 - Basic and Diluted Earnings Per Common Share (Details Textual) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 92,470 87,659 44,150 130,876