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Note 6 - Share-based Compensation - Stock Option Activity (Details)
 6 Months Ended
Jan. 01, 2024
USD ($)
$ / shares
shares
Jun. 30, 2024
USD ($)
$ / shares
shares
Outstanding at December 31, 2023 (in shares) | shares 5,469,247 5,469,247
Outstanding at December 31, 2023 (in dollars per share) | $ / shares $ 3.08 $ 3.08
Outstanding at December 31, 2023 (Year) 5 years 7 months 28 days 5 years 9 months 29 days
Outstanding at December 31, 2023 | $ $ 322,738 $ 138,360
Granted (1) (in shares) | shares   812,600 [1]
Granted (1) (in dollars per share) | $ / shares   $ 1.6 [1]
Exercised (in shares) | shares   (30,000)
Exercised (in dollars per share) | $ / shares   $ 1.36
Expired (2) (in shares) | shares   (358,500) [1],[2]
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price (in dollars per share) | $ / shares   $ 2.1 [1],[2]
Canceled (3) (in shares) | shares   (63,125) [3]
Canceled (3) (in dollars per share) | $ / shares   $ 1.59 [3]
Outstanding at June 30, 2024 (in shares) | shares   5,830,222
Outstanding at June 30, 2024 (in dollars per share) | $ / shares   $ 2.96
Exercisable at June 30, 2024 (in shares) | shares   4,430,623
Exercisable at June 30, 2024 (in dollars per share) | $ / shares   $ 3.2
Exercisable at June 30, 2024 (Year)   4 years 10 months 20 days
Exercisable at June 30, 2024 | $   $ 109,383
[1] Represents the following options granted: Annual share-based compensation awards on January 2, 2024, with an exercise price of $1.59, including: (a) 387,500 stock options granted to executives and key personnel, vesting upon one year anniversary, or annually in equal installments over four years, (b) 352,500 stock options granted to members of the Board of Directors, vesting upon one year anniversary, (c) 17,600 stock options granted to employees, vesting annually in equal installments over four years, and (d)15,000 stock options granted to a consultant, vesting upon one year anniversary. One-time awards on April 11, 2024, with an exercise price of $1.84, including 20,000 stock options granted to an executive, vesting annually in equal installments over four years, and 20,000 stock options granted to a member of the Board of Directors, vesting upon one year anniversary.
[2] Represents the following options expired: (a) 300,000 stock options with an exercise price of $1.87 per share granted to an executive, (b) 25,000 stock options with an exercise price of $1.76 per share granted to a member of the Board of Directors, (c) 7,500 stock options with an exercise price of $5.56 per share granted to a consultant, (d) 25,000 stock options with an exercise price of $4.14 per share granted to a consultant, and (e) 1,000 stock options with an exercise price of $1.55 per share granted to an employee.
[3] Represents the following options canceled: (a) 50,000 stock options granted to a former Board of Directors, (b) 13,125 stock options granted to the Company's former Chairman of the Board of Directors.