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Note 7 - Stockholders' Equity - Warrants (Details)
 3 Months Ended
Mar. 31, 2023
$ / shares
shares
Balance as of December 31, 2022 (in shares) | shares 2,424,724
Balance as of December 31, 2022 (in dollars per share) | $ / shares $ 6.36
Warrants for common stock sold (in shares) | shares 0
Warrants for common stock sold (in dollars per share) | $ / shares $ 0
Warrants for common stock exercised (in shares) | shares 0
Warrants for common stock exercised (in dollars per share) | $ / shares $ 0
Balance as of March 31, 2023 (in shares) | shares 2,424,724
Balance as of March 31, 2023 (in dollars per share) | $ / shares $ 6.36