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Note 7 - Shareholders' Equity - Summary of Restricted Stock Activity (Details) - Restricted Stock [Member]
12 Months Ended
Dec. 31, 2022
$ / shares
shares
Non-vested restricted stock (in shares) | shares 0
Non-vested restricted stock, weighted-average grant date fair value (in dollars per share) | $ / shares $ 0
Granted (in shares) | shares 4,920,000
Granted, weighted-average grant date fair value (in dollars per share) | $ / shares $ 0.20
Vested (in shares) | shares (70,000)
Vested, weighted-average grant date fair value (in dollars per share) | $ / shares $ 0.22
Cancelled/expired/rescinded (in shares) | shares (4,850,000)
Cancelled/expired/rescinded, weighted-average grant date fair value (in dollars per share) | $ / shares $ 0.20
Non-vested restricted stock (in shares) | shares 0
Non-vested restricted stock, weighted-average grant date fair value (in dollars per share) | $ / shares $ 0