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Note 6 - Net Loss Per Common Share (Details Textual) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 3,462,000 4,525,000 3,316,000 3,528,000