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Note 9 - Net Loss Per Share of Common Stock (Details Textual) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 1,345,782 1,283,607 1,345,782 1,283,607