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Note 9 - Share Based Payments - Stock Options Exercisable and Expected to Vest (Details)
 12 Months Ended
Dec. 31, 2022
USD ($)
$ / shares
shares
Stock options exercisable, Options (in shares) 790,000
Stock options exercisable, Weighted average remaining contractual life (Year) 8 years 29 days
Stock options exercisable, Weighted average exercise price (in dollars per share) | $ / shares $ 0.25
Stock options exercisable, Aggregate intrinsic value | $ $ 248
Stock options expected to vest, Options (in shares) 1,550,000
Stock options expected to vest, Weighted average remaining contractual life (Year) 9 years 9 months 7 days
Stock options expected to vest, Weighted average exercise price (in dollars per share) | $ / shares $ 0.62
Stock options expected to vest, Aggregate intrinsic value | $ $ 0
Options exercisable and expected to vest, Options (in shares) 2,340,000