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Note 7 - Earnings (Loss) Per Share (Details Textual) - shares
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 500 500      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance 70,000 70,000 70,000 60,000