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Note 6 - Share-based Compensation (Details Textual) - USD ($)
12 Months Ended
Sep. 23, 2024
Apr. 11, 2024
Mar. 13, 2024
Jan. 02, 2024
Jan. 03, 2023
Apr. 16, 2021
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)             5,788,597 5,469,247 5,031,097
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)             $ 1.61 [1] $ 1.45  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)             830,725 [1] 805,350  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)             55,000 [2] (0)  
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share)             $ 1.18 [2] $ 0  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period (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  
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  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period (in shares)             383,063 [3] 351,520  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period (in shares)             73,312 [4] 15,680  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)             $ 0.95 $ 0.81  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value             $ 33,300 $ 0  
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount             $ 319,978 $ 559,121  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)             2 years 4 months 24 days 2 years 8 months 4 days  
Executives and Key Personnel [Member]                  
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)       $ 1.59          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)       387,500          
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period (Year)         1 year        
Director [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)       352,500          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period (in shares)             25,000    
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price (in dollars per share)             $ 1.76    
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price (in dollars per share)             $ 1.76    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period (in shares)             25,000    
Employees [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)       17,600          
Consultant [Member]                  
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) $ 1.79                
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) 25,000     15,000          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 3 years     1 year          
Executive And Board Of Directors [Member]                  
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)   $ 1.84              
Executive Officer [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)   20,000              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   4 years              
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period (in shares)             300,000    
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price (in dollars per share)             $ 1.87    
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price (in dollars per share)             $ 1.87    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period (in shares)             300,000    
Board of Directors [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)   13,125              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   1 year              
Consultant One [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period (in shares)             7,500    
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price (in dollars per share)             $ 5.56    
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price (in dollars per share)             $ 5.56    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period (in shares)             7,500    
Consultant Two [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period (in shares)             25,000    
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price (in dollars per share)             $ 4.14    
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price (in dollars per share)             $ 4.14    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period (in shares)             25,000    
Former Board of Directors [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period (in shares)             50,000    
Former Chairman of the Board of Directors [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period (in shares)             13,125    
Former Employee [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period (in shares)             10,187    
Share-Based Payment Arrangement, Employee [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period (in shares)             25,563    
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price (in dollars per share)             $ 2.93    
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price (in dollars per share)             $ 2.93    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period (in shares)             25,563    
Share-Based Payment Arrangement, Option [Member] | Executives and Key Personnel [Member] | Share-based Compensation Award Tranche Two through Five [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)         4 years        
Share-Based Payment Arrangement, Option [Member] | Director [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)         1 year        
Share-Based Payment Arrangement, Option [Member] | Minimum [Member] | Employees [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)       4 years          
Stock Options 1 [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)             25,000    
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share)             $ 0.97    
Stock Options 2 [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)             30,000    
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share)             $ 1.36    
Restricted Stock Units (RSUs) [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) [5]             354,219    
Restricted Stock Units (RSUs) [Member] | Executives and Key Personnel [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)     212,709       212,709    
Restricted Stock Units (RSUs) [Member] | Director [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)       1 year          
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)       141,510     174,837    
Restricted Stock Units (RSUs) [Member] | Contractor [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)             50,000    
The 2021 Plan [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares)           3,000,000      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)             5,788,597 5,469,247  
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)             2,056,629 3,672,561  
The 2021 Plan [Member] | Share-Based Payment Arrangement, Option [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)               10 years  
The 2021 Plan [Member] | Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Nonemployee [Member] | Minimum [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)             2 years    
The 2021 Plan [Member] | Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Nonemployee [Member] | Maximum [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)             3 years    
[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.
[5] On January 2, 2024, the Company granted 141,510 RSUs, vesting upon one year anniversary of the grant, to members of the Board of Directors. On March 13, 2024, the Company granted 212,709 RSUs with immediate vesting, to executives and key personnel in lieu of cash bonuses earned for the year of 2023. The fair value of the restricted stock unit is the Company’s closing stock price on the grant date as reported on the Nasdaq Stock Exchange.