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Note 6 - Share-based Compensation - Stock Option Activity (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Outstanding, shares (in shares)   4,638,390 3,860,390
Outstanding, weighted average exercise price (in dollars per share)   $ 2.44 $ 1.76
Weighted-average remaining contractual term, outstanding (Year) 5 years 8 months 8 days 6 years 1 month 20 days 5 years 7 months 20 days
Aggregate intrinsic value, outstanding $ 13,287,932 $ 8,413,444 $ 13,701,610
Granted, shares (in shares)   870,825 [1] 913,000
Granted, weighted average exercise price (in dollars per share)   $ 5.11 [1] $ 5.24
Exercised, shares (in shares)   (735,000) [2] (135,000)
Exercised, weighted average exercise price (in dollars per share)   $ 1.67 [2] $ 1.89
Expired, shares (in shares)   0 0
Expired, weighted average exercise price (in dollars per share)   $ 0 $ 0
Canceled, shares (in shares)   0 0
Canceled, weighted average exercise price (in dollars per share)   $ 0 $ 0
Outstanding, shares (in shares) 3,860,390 4,774,215 4,638,390
Outstanding, weighted average exercise price (in dollars per share) $ 1.76 $ 3.04 $ 2.44
Exercisable, shares (in shares)   3,384,516  
Exercisable, weighted average exercise price (in dollars per share)   $ 2.45  
Weighted-average remaining contractual term, exercisable (Year)   5 years 2 months 15 days  
Aggregate intrinsic value, exercisable   $ 7,674,636  
[1] Represents the following stock options granted: • Annual share-based compensation awards on January 4, 2021, including: (a) 417,500 stock options with an exercise price of $5.16 per share granted to executives and key personnel, upon one year anniversary, or vesting annually in equal installments over four years, (b) 227,500 stock options with an exercise price of $5.16 per share granted to members of the Board of Directors, vesting upon one year anniversary, (c) 23,325 stock options with an exercise price of $5.16 per share granted to employees, vesting annually in equal installments over four years and (d) 5,000 stock options with an exercise price of $5.16 per share granted to a consultant, vesting upon one year anniversary. • One-time award on January 8, 2021, 35,000 stock options with an exercise price of $5.50 per share granted to a new member of the Board of Directors, vesting in one year from the grant date. • One-time award on January 21, 2021, 7,500 stock options with an exercise price of $5.65 per share granted to a consultant, vesting in one year from the grant date. • One-time award on March 22, 2021, 30,000 stock options with an exercise price of $6.87 per share granted to a consultant, vesting in one year from the grant date. • One-time award on August 24, 2021, 25,000 stock options with an exercise price of $4.96 per share granted to a consultant, vesting in one year from the grant date. • One-time award on November 1, 2021, 25,000 stock options with an exercise price of $4.14 per share granted to a consultant, vesting in one year from the grant date. • One-time award on November 9, 2021, 75,000 performance-based stock options with an exercise price of $4.10 per share granted to a new executive, vesting upon the achievement of specific performance conditions. As of December 31, 2021. the Company believes that the achievement of the requisite performance conditions is not probable and, as a result, no compensation cost has been recognized for these awards.
[2] Represents the following stock options exercised: • 500,000 stock options exercised at $1.67, 150,000 stock options exercised at $1.63, 60,000 stock options exercised at $1.93, and 25,000 stock options exercised at $1.39.