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Note 3 - Shareholders' Equity - Restricted Stock Activity (Details) - Restricted Stock [Member]
 9 Months Ended
Sep. 30, 2024
$ / shares
shares
Outstanding, shares (in shares) | shares 235,172
Outstanding, weighted average grant date price (in dollars per share) | $ / shares $ 4.21
Granted to employees and directors, shares (in shares) | shares 29,675
Granted to employees and directors, weighted average grant date price (in dollars per share) | $ / shares $ 1.92
Vested, shares (in shares) | shares (8,172)
Vested, weighted average grant date price (in dollars per share) | $ / shares $ 4.02
Outstanding, shares (in shares) | shares 256,675
Outstanding, weighted average grant date price (in dollars per share) | $ / shares $ 3.96