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Note 9 - Stockholders' Equity - Share Incentive Plan Activity (Details) - Restricted Stock Units (RSUs) [Member]
9 Months Ended
Sep. 30, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
USD ($)
Outstanding, units (in shares) | shares 301,111  
Outstanding, weighted average grant-date fair value (in dollars per share) | $ / shares $ 4.8  
Outstanding, aggregated intrinsic value | $ $ 0 $ 0
Granted, units (in shares) | shares 225,604  
Granted, weighted average grant-date fair value (in dollars per share) | $ / shares $ 3  
Vested and settled with share issuance, units (in shares) | shares (212,253)  
Vested and settled with share issuance, weighted average grant-date fair value (in dollars per share) | $ / shares $ (4.86)  
Outstanding, September 30, 2023 (in shares) | shares 314,462  
Outstanding, September 30, 2023 (in dollars per share) | $ / shares $ 3.46