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Note 5 - Net Loss Per Common Share (Details Textual) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 4,525,000 11,288,000 3,528,000 11,469,000