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Note 4 - Basic and Diluted Loss Per Common Share (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 376,130 51,270 351,684 51,155