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Note 2 - Income Per Share (Details Textual) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options 0   0  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0 0 0 0