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Note 9 - Income Per Share (Details Textual) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 10,716 14,892 10,716 14,892