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Note 7 - Earnings Per Share (Details Textual) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Weighted Average Number of Shares Outstanding, Diluted 3,869,885 3,873,171 3,872,765 3,873,171
Weighted Average Number of Shares Outstanding, Basic 3,811,409 3,779,464 3,811,409 3,779,464