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Note 8 - Stock Option Plans - Schedule of Restricted Stock (Details) - Restricted Stock [Member]
 6 Months Ended
Jun. 30, 2025
$ / shares
shares
Non-vested as January 1, 2025 (in shares) 365,171
Non-vested as January 1, 2025 (in dollars per share) | $ / shares $ 0.89
Granted, Shares (in shares) 0
Vested, Shares (in shares) (337,081)
Vested, Weighted Average Grant-Date Fair Value per Award (in dollars per share) | $ / shares $ 0.89
Cancelled, Shares (in shares) (28,090)
Cancelled, Weighted Average Grant-Date Fair Value per Award (in dollars per share) | $ / shares $ 0.89
Non-vested as June 30, 2025 (in shares) 0
Non-vested, Weighted Average Grant-Date Fair Value per Award (in dollars per share) | $ / shares $ 0