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Note 9 - Stock Based Compensation (Details Textual) - USD ($)
1 Months Ended 3 Months Ended
Apr. 19, 2019
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Jan. 08, 2021
Jun. 02, 2015
Share-Based Payment Arrangement, Employee [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period (in shares)       340,000    
Share-Based Payment Arrangement, Option [Member]            
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount     $ 6,086      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)     1 year 10 months 24 days      
Restricted Stock Units (RSUs) [Member] | Share-Based Payment Arrangement, Employee [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)   50,000        
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)   25,000        
Share-Based Payment Arrangement, Expense   $ 6,250        
Restricted Stock Units (RSUs) [Member] | Share-Based Payment Arrangement, Employee [Member] | Vest Based on Certain Performance Hurdles Prior to December 2024 [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)   25,000        
Maximum [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)     10 years      
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)     3 years      
Minimum [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)     5 years      
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)     1 year      
The 2015 Plan [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)           26,112
Share-based Compensation Arrangement by Share-based Payment Award, Annual Increase of Shares Authorized, Percentage           1.00%
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares) 45,445          
The 2015 Plan [Member] | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Annual Increase of Shares Authorized, Shares (in shares)           2,223
The 2021 Plan [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)         111,112  
Share-based Compensation Arrangement by Share-based Payment Award, Annual Increase of Shares Authorized, Percentage         1.00%  
The 2021 Plan [Member] | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Annual Increase of Shares Authorized, Shares (in shares)         5,556