v3.25.4
Note 8 - Stockholders' Equity - Stock Option and Warrant Activity (Details) - $ / shares
 3 Months Ended
Mar. 05, 2025
Dec. 31, 2025
Dec. 31, 2024
Outstanding, options (in shares)   1,988,677  
Outstanding, options, weighted average exercise price (in dollars per share)   $ 1.99  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)   0  
Granted, options, weighted average exercise price (in dollars per share)   $ 0  
Exercised or redeemed, options (in shares)   (1,000) 0
Exercised or redeemed, options, weighted average exercise price (in dollars per share)   $ 0.81  
Forfeited, Options (in shares) (108)    
Expired, options (in shares)   (25,000)  
Expired, options, weighted average exercise price (in dollars per share)   $ 1.79  
Expired, warrants (in shares)   (1,327) 0
Outstanding, options (in shares)   1,962,677  
Outstanding, options, weighted average exercise price (in dollars per share)   $ 2  
Outstanding, warrants (in shares)   860,206  
Restricted Stock [Member]      
Forfeited, options (in shares)   0  
Options vested and exercisable (in shares)   1,603,505  
Share-Based Payment Arrangement, Option [Member]      
Forfeited, Options (in shares)   0  
Options vested and exercisable (in shares)   2.19  
Stock Warrants [Member]      
Outstanding, warrants (in shares)   861,533  
Outstanding, warrants, weighted average exercise price (in dollars per share)   $ 2.77  
Granted, warrants (in shares)   0  
Granted, warrants, weighted average exercise price (in dollars per share)   $ 0  
Exercised or redeemed, warrants (in shares)   0  
Exercised or redeemed, warrants, weighted average exercise price (in dollars per share)   $ 0  
Expired, warrants (in shares)   (1,327)  
Expired, warrants, weighted average exercise price (in dollars per share)   $ 132.5  
Outstanding, warrants (in shares)   860,206  
Outstanding, warrants, weighted average exercise price (in dollars per share)   $ 2.42