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Note 10 - Earnings Per Share (Details Textual) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) 417,000 447,930 417,000 447,930
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares) 292,000 267,930 292,000 267,930
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 417,000 447,930 417,000 417,000