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Note 6 - Share-based Compensation - Stock Option Activity (Details) - USD ($)
 3 Months Ended
Jan. 01, 2025
Mar. 31, 2025
Outstanding, shares (in shares) 5,788,597 5,788,597
Outstanding, weighted average exercise price (in dollars per share) $ 2.97 $ 2.97
Outstanding, weighted-average remaining contractual term (Year) 5 years 4 months 2 days 5 years 6 months 10 days
Outstanding, aggregate intrinsic value $ 655,578 $ 0
Granted, shares (in shares) [1]   673,500
Granted, weighted average exercise price (in dollars per share) [1]   $ 1.74
Exercised, shares (in shares) [2]   (55,000)
Exercised, weighted average exercise price (in dollars per share) [2]   $ 1.17
Canceled, shares (in shares) [3]   (102,500)
Canceled, weighted average exercise price (in dollars per share) [3]   $ 3.47
Outstanding, shares (in shares)   6,304,597
Outstanding, weighted average exercise price (in dollars per share)   $ 2.85
Exercisable, shares (in shares)   5,055,247
Exercisable, weighted average exercise price (in dollars per share)   $ 3.09
Exercisable, weighted-average remaining contractual term (Year)   4 years 8 months 15 days
Exercisable, aggregate intrinsic value   $ 0
[1] Represents the following options granted: • Annual share-based compensation awards on January 2, 2025, with an exercise price of $1.74, including: (a) 356,500 stock options granted to executives and key personnel, vesting upon one year anniversary, or annually in equal installments over four years, (b) 277,500 stock options granted to members of the Board of Directors, vesting upon one year anniversary, (c) 19,500 stock options granted to employees, vesting annually in equal installments over four years, and (d) 20,000 stock options granted to a consultant, vesting upon one year anniversary.
[2] Repre sents the following options exercised: (a) 25,000 stock options with an exercise price of $0.97 per share exercised by a board member (b) 30,000 stock options with an exercise price of $1.33 per share exercised by a board member.
[3] Represents the following options canceled: (a) 27,500 stock options with an exercise price of $1.75 per share granted to a consultant and (b) 75,000 stock option with an exercise price of $4.10 per share granted to key personnel.