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Note 6 - Share-based Compensation - Stock Option Activity (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Outstanding, shares (in shares) 5,469,247 5,031,097  
Outstanding, weighted average exercise price (in dollars per share) $ 3.08 $ 3.25  
Outstanding, weighted-average remaining contractual term (Year) 5 years 4 months 2 days 5 years 7 months 28 days 5 years 9 months
Outstanding, aggregate intrinsic value $ 655,578 $ 322,738 $ 13,000
Granted, shares (in shares) 830,725 [1] 805,350  
Granted, weighted average exercise price (in dollars per share) $ 1.61 [1] $ 1.45  
Exercised, shares (in shares) (55,000) [2] 0  
Exercised, weighted average exercise price (in dollars per share) $ 1.18 [2] $ 0  
Expired, shares (in shares) (383,063) [3] (351,520)  
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price (in dollars per share) $ 2.16 [3] $ 1.71  
Canceled, shares (in shares) (73,312) [4] (15,680)  
Canceled, weighted average exercise price (in dollars per share) $ 1.73 [4] $ 3.5  
Outstanding, shares (in shares) 5,788,597 5,469,247 5,031,097
Outstanding, weighted average exercise price (in dollars per share) $ 2.97 $ 3.08 $ 3.25
Exercisable, shares (in shares) 4,438,810    
Exercisable, weighted average exercise price (in dollars per share) $ 3.19    
Exercisable, weighted-average remaining contractual term (Year) 4 years 5 months 8 days    
Exercisable, aggregate intrinsic value $ 436,263    
[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 13,125 stock options granted to a member of the Board of Directors, vesting upon one year anniversary. A one-time award on September 23, 2024, of 25,000 stock options granted to a consultant with an exercise price of $1.79, vesting in three months.
[2] Represents the following options exercised: (a) 25,000 stock options exercised at $0.97, and (b) 30,000 stock options exercised at $1.36.
[3] (3) 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) 25,563 stock options with a weighted average exercise price of $2.93 per share granted to employees.
[4] (4) Represents the following options canceled: (a) 50,000 stock options granted to a former member of the Board of Directors, (b) 13,125 stock options granted to the Company's former Chairman of the Board of Directors, and (c) 10,187 stock options granted to the Company's former employee.