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Note 6 - Stockholders' Equity (Details Textual) - USD ($)
3 Months Ended
Mar. 05, 2026
Dec. 19, 2025
Mar. 05, 2025
May 14, 2021
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)   19,500     0 0    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value   $ 27,275            
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)         2 years      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount         $ 61,075 $ 134,775    
Share-Based Payment Arrangement, Option [Member] | Selling, General, and Administrative Expense [Member]                
Share-Based Payment Arrangement, Expense         $ 15,269 $ 19,477    
Restricted Stock [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)         17,500 39,500    
The 2021 Stock Incentive Plan [Member] | Share-Based Payment Arrangement, Option [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)       10 years        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)       500,000        
Executive Bonus Plan 2024 [Member]                
Shares Issuable, Maximum, Percentage of Declared Bonus     25.00%          
Shares Issuable Valued, Percentage of Weighted Average Trade Value               90.00%
Executive Bonus Plan 2024 [Member] | Chief Executive Officer [Member]                
Stock Issued During Period, Shares, Treasury Stock Reissued (in shares)     2,100          
Executive Bonus Plan 2024 [Member] | Chief Financial Officer [Member]                
Stock Issued During Period, Shares, Treasury Stock Reissued (in shares)     1,855          
Executive Bonus Plan 2025 [Member]                
Shares Issuable, Maximum, Percentage of Declared Bonus 25.00%              
Shares Issuable Valued, Percentage of Weighted Average Trade Value             90.00%  
Executive Bonus Plan 2025 [Member] | Chief Executive Officer [Member]                
Stock Issued During Period, Shares, Treasury Stock Reissued (in shares) 750              
Executive Bonus Plan 2025 [Member] | Chief Financial Officer [Member]                
Stock Issued During Period, Shares, Treasury Stock Reissued (in shares) 611