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Note 2 - Income Per Share (Details Textual) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0 0  
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding, Ending Balance 0 0 0