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Note 9 - Stock Based Compensation (Details Textual) - USD ($)
1 Months Ended 9 Months Ended
Apr. 01, 2024
Mar. 31, 2024
Feb. 28, 2023
Jan. 31, 2023
Dec. 31, 2022
Jun. 30, 2024
Jan. 08, 2021
The 2021 Plan [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)             4
Share-Based Payment Arrangement, Option [Member]              
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount           $ 3,925  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)           9 months  
Share-Based Payment Arrangement, Option [Member] | Board of Directors [Member]              
Share-Based Payment Arrangement, Expense $ 4,300            
Restricted Stock [Member] | Board of Directors [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)   16,000 445        
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Granted in Period, Fair Value   $ 13,760 $ 5,660        
Restricted Stock [Member] | Board of Directors [Member] | Share-Based Payment Arrangement, Tranche One [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage   0.25% 0.25%        
Restricted Stock [Member] | Board of Directors [Member] | Share-Based Payment Arrangement, Tranche Three [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage   0.25% 0.25%        
Restricted Stock [Member] | Board of Directors [Member] | Share-Based Payment Arrangement, Tranche Four [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage   0.25% 0.25%        
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)       3,889 1,112    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Granted in Period, Fair Value       $ 40,950      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)         556    
Share-Based Payment Arrangement, Expense         $ 6,250    
Restricted Stock Units (RSUs) [Member] | Vest Based on Certain Performance Hurdles Prior to December 2024 [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)         556