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Note 7 - Income Per Share (Details Textual) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 12,336 52,377 27,336 53,695