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Note 10 - Share Based Payments - Stock Options Exercisable and Expected to Vest (Details)
12 Months Ended
Dec. 31, 2021
USD ($)
$ / shares
shares
Stock options exercisable, Options (in shares) 1,300,000
Stock options exercisable, Weighted average remaining contractual life (Year) 5 years 7 months 17 days
Stock options exercisable, Weighted average exercise price (in dollars per share) | $ / shares $ 0.21
Stock options exercisable, Aggregate intrinsic value | $ $ 322
Stock options expected to vest, Options (in shares) 150,000
Stock options expected to vest, Weighted average remaining contractual life (Year) 9 years 4 months 2 days
Stock options expected to vest, Weighted average exercise price (in dollars per share) | $ / shares $ 0.46
Stock options expected to vest, Aggregate intrinsic value | $ $ 0
Options exercisable and expected to vest, Options (in shares) 1,450,000