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Note 6 - Share-based Compensation (Details Textual) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 23, 2024
Apr. 11, 2024
Mar. 14, 2024
Jan. 02, 2024
Jan. 03, 2023
Sep. 30, 2024
Mar. 31, 2024
Sep. 30, 2024
Dec. 31, 2023
Apr. 16, 2021
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)           5,845,035   5,845,035 5,469,247  
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) [1]               $ 1.31    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) [1],[2]               837,600    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period (in shares) [1],[2]               358,500    
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price (in dollars per share) [1],[2]               $ 2.1    
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price (in dollars per share) [1],[2]               $ 2.1    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period (in shares) [1],[2]               358,500    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period (in shares) [3]               73,312    
Shares Granted, Value, Share-Based Payment Arrangement, Forfeited           $ 9,000   $ 50,000    
Minimum [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)               2 years 7 months 17 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)   20,000                
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    
Employee [Member]                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period (in shares)               1,000    
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price (in dollars per share)               $ 1.55    
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price (in dollars per share)               $ 1.55    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period (in shares)               1,000    
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, 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] | 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]               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      
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] | Executive Officer [Member]                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)     212,709              
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 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)           5,845,035   5,845,035 5,469,247  
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number (in shares)           117,925   117,925 243,044  
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)           2,025,191   2,025,191 2,773,406  
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)               2 years    
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)               2 years    
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)               5 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)               5 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 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) 1,000 stock options with an exercise price of $1.55 per share granted to an employee.
[2] 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 20,000 stock options granted to a member of the Board of Directors, vesting upon one year anniversary. • One-time awards on September 23, 2024, 25,000 stock option granted to a consultant with an exercise price of $1.79, vesting in three months.
[3] Represents the following options canceled: (a) 50,000 stock options granted to a former 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.
[4] 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 ended 2023. On January 2, 2024, the Company granted 141,510 RSUs, vesting upon one year anniversary of the grant, to the Board of Directors. The fair value of the common stock is the Company's closing stock price on the grant date as reported on the Nasdaq Stock Exchange.