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Note 10 - Stockholders' Equity - Oustanding Common Stock Purchase Warrants (Details) - Purchase Warrants [Member]
9 Months Ended
Sep. 30, 2021
$ / shares
shares
Purchase Warrants, Number of Common Shares (in shares) | shares 1,391,667
Warrants, exercise price (in dollars per share) | $ / shares $ 6.00
Purchase Warrants, Expiration Date Jun. 01, 2022