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Note 6 - Share-based Compensation - Stock Option Activity (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Jan. 01, 2022
Outstanding, shares (in shares) 5,031,097 4,774,215    
Outstanding, weighted average exercise price (in dollars per share) $ 3.25 $ 3.04    
Weighted-average remaining contractual term, outstanding (Year) 5 years 7 months 28 days 5 years 9 months 6 years 1 month 20 days  
Aggregate intrinsic value, outstanding $ 322,738 $ 13,000   $ 8,413,444
Granted. shares (in shares) 805,350 [1] 865,825    
Granted, weighted average exercise price (in dollars per share) $ 1.45 [1] $ 4.43    
Exercised, shares (in shares) 0 (333,943)    
Exercised, weighted average exercise price (in dollars per share) $ 0 $ 1.63    
Expired, shares (in shares) (351,520) [2] (200,000)    
Expired, weighted average exercise price (in dollars per share) $ 1.71 [2] $ 5.47    
Canceled, shares (in shares) (15,680) [3] (75,000)    
Canceled, weighted average exercise price (in dollars per share) $ 3.5 [3] $ 4.81    
Outstanding, shares (in shares) 5,469,247 5,031,097 4,774,215  
Outstanding, weighted average exercise price (in dollars per share) $ 3.08 $ 3.25 $ 3.04  
Exercisable, shares (in shares) 4,160,298      
Exercisable, weighted average exercise price (in dollars per share) $ 3.15      
Weighted-average remaining contractual term, exercisable (Year) 4 years 9 months 21 days      
Aggregate intrinsic value, exercisable $ 161,427      
[1] Represents the following stock options granted: • Annual share-based compensation awards on January 3, 2023, including: (a) 406,250 stock options with an exercise price of $1.38 per share granted to executives and key personnel, upon one year anniversary, or vesting annually in equal installments over four years, (b) 262,500 stock options with an exercise price of $1.38 per share granted to members of the Board of Directors, vesting upon one year anniversary, (c) 24,100 stock options with an exercise price of $1.38 per share granted to employees, vesting annually in equal installments over four years, and (d) 15,000 stock options with an exercise price of $1.38 per share granted to a consultant, vesting upon one year anniversary. • Throughout the year the following stock options were granted: (a) on May 30, 2023, 37,500 stock options with an exercise price of $2.23 per share granted to a consultant, vesting over two months from the grant date, (b) on September 15, 2023, 55,000 stock options with an exercise price of $1.75 per share granted to a consultant, vesting over a year and half from the grant date, and (c) on October 23, 2023, 5,000 stock options with an exercise price of $1.66 per share granted to an employee vesting annually in equal installments over four years.
[2] Represents the following stock options expired: • 270,000 stock options with an exercise price of $1.39 per share granted to executive, (b) 25,000 stock options with an exercise price of $3.99 per share granted to a consultant, (c) 25,000 stock options with an exercise price of $1.75 per share granted to a member of the Board of Directors, (d) 31,520 stock options with an exercise price ranging between $1.39 and $5.27 per share granted to a former employee.
[3] Represents the cancellation of unvested portion of the stock options granted previously to a former employee with exercise price ranging between $1.39 to $5.27.