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Note 8 - Income Per Share (Details Textual) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0 0 10,344 27,336