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Note 6 - Share-based Compensation (Details Textual) - USD ($)
12 Months Ended
Dec. 06, 2023
Oct. 23, 2023
Sep. 15, 2023
May 30, 2023
Jan. 03, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Apr. 16, 2021
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)           5,469,247 5,031,097 4,774,215  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)           805,350 [1] 865,825    
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)           $ 1.45 [1] $ 4.43    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period (in shares)           351,520 [2] 200,000    
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price (in dollars per share)           $ 1.71 [2] $ 5.47    
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price (in dollars per share)           3.5 [3] 4.81    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)           $ 0.81 $ 2.49    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value           $ 0 $ 365,000    
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount           $ 559,121 $ 919,000    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)           2 years 8 months 4 days 2 years 9 months 3 days    
Share-Based Payment Arrangement, Expense           $ 1,244,121 $ 1,888,944    
Minimum [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)             5 years 6 months    
Maximum [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)             6 years 3 months    
Executives and Key Personnel [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)         406,250        
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)         $ 1.38        
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)         262,500        
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)         $ 1.38        
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)           $ 1.75      
Employees [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)         24,100        
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)         $ 1.38        
Consultant [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)         15,000        
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)         $ 1.38        
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)           $ 3.99      
Consultant Two [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)       37,500          
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)       $ 2.23          
Consultant Three [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)     55,000            
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)     $ 1.75            
Executive Officer [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period (in shares)           270,000      
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price (in dollars per share)           $ 1.39      
Former Employee [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period (in shares)           31,520      
Former Employee [Member] | Minimum [Member]                  
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price (in dollars per share)           $ 1.39      
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price (in dollars per share)           1.39      
Former Employee [Member] | Maximum [Member]                  
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price (in dollars per share)           5.27      
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price (in dollars per share)           $ 5.27      
Share-Based Payment Arrangement, Option [Member]                  
Share-Based Payment Arrangement, Expense           $ 1,004,054 $ 1,888,944    
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] | Employees [Member] | Minimum [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)         4 years        
Share-Based Payment Arrangement, Option [Member] | Consultant [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)         1 year        
Share-Based Payment Arrangement, Option [Member] | Consultant Two [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)       2 months          
Share-Based Payment Arrangement, Option [Member] | Consultant Three [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)     1 year 6 months            
Share-Based Payment Arrangement, Option [Member] | Employee [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)   5,000              
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)   $ 1.66              
Share-Based Payment Arrangement, Option [Member] | Employee [Member] | Minimum [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   4 years              
Share-Based Payment Arrangement, Option [Member] | Share-based Compensation Award Tranche Two through Five [Member] | Executives and Key Personnel [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)         4 years        
Restricted Stock Units (RSUs) [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) [4]           461,005      
Share-Based Payment Arrangement, Expense           $ 240,067 0    
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) 50,000       163,044        
Restricted Stock Units (RSUs) [Member] | Executive Officer [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)         247,961        
Performance Award [Member]                  
Share-Based Payment Arrangement, Expense           $ 0 $ 0    
The 2011 Plan [Member]                  
Common Stock, Capital Shares Reserved for Future Issuance (in shares)                 3,000,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)           5,469,247 5,031,097    
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)           2,773,406 3,672,561    
The 2011 Plan [Member] | Share-Based Payment Arrangement, Option [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)           10 years      
The 2011 Plan [Member] | Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Tranche One [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)           1 year      
The 2011 Plan [Member] | Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Tranche One [Member] | Contractor [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)           1 year      
The 2011 Plan [Member] | Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Tranche One [Member] | Chief Executive Officer [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)           5 years      
The 2011 Plan [Member] | Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Tranche Two [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)           3 years      
The 2011 Plan [Member] | Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Tranche Two [Member] | Contractor [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)           3 years      
The 2011 Plan [Member] | Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Tranche Two [Member] | Chief Executive Officer [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)           10 years      
[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.
[4] On January 3, 2023, the Company granted 247,961 RSUs with immediate vesting, to executives and key personnel in lieu of cash bonuses earned for the year ended 2022. The Company also granted 163,044 RSUs, vesting upon one year anniversary of the grant, to the Board of Directors as a result of the Board agreeing to a reduction in director cash compensation for 2023. On December 6, 2023, the Company granted 50,000 RSUs to a consultant, vesting at the end of the service period.