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Note 8 - Earnings 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 0 110,000 15,000 100,000