v3.26.1
Note 5 - Share-based Compensation - Stock Options (Details) - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
2024 Equity Incentive Plan [Member]    
Options outstanding, balance (in shares) 5,493,920 0
Weighted average exercise price, balance (in dollars per share) $ 0.23 $ 0
Options outstanding, Granted (in shares) 11,299,094 5,493,920
Weighted average exercise price, Granted (in dollars per share) $ 0.2 $ 0.23
Options outstanding, balance (in shares) 16,793,014 5,493,920
Weighted average exercise price, balance (in dollars per share) $ 0.21 $ 0.23
Weighted average remaining term, balance (Year) 9 years 1 month 6 days  
Aggregate intrinsic Value, Balance [1] $ 32,000  
Options outstanding, Non-vested (in shares) (4,351,214)  
Weighted average exercise price, Non-vested (in dollars per share) $ 0.17  
Options outstanding, Vested (in shares) 12,441,800  
Weighted average exercise price, Vested (in dollars per share) $ 0.22  
Weighted average remaining term, Vested (Year) 9 years 1 month 6 days  
Aggregate intrinsic Value, vested $ 32,000  
2018 Equity Incentive Plan [Member]    
Options outstanding, balance (in shares) 42,171,386 41,108,448
Weighted average exercise price, balance (in dollars per share) $ 0.19 $ 0.19
Options outstanding, Granted (in shares)   1,547,938
Weighted average exercise price, Granted (in dollars per share)   $ 0.3
Options outstanding, balance (in shares) 41,604,435 42,171,386
Weighted average exercise price, balance (in dollars per share) $ 0.19 $ 0.19
Weighted average remaining term, balance (Year) 5 years 9 months 18 days  
Aggregate intrinsic Value, Balance [1] $ 499,000  
Options outstanding, Non-vested (in shares) (1,934,723)  
Weighted average exercise price, Non-vested (in dollars per share) $ 0.22  
Options outstanding, Vested (in shares) 39,669,712  
Weighted average exercise price, Vested (in dollars per share) $ 0.19  
Weighted average remaining term, Vested (Year) 5 years 8 months 12 days  
Aggregate intrinsic Value, vested $ 493,000  
Options Outstanding, Exercised (in shares) (566,951) (485,000)
Weighted average exercise price, Exercised (in dollars per share) $ 0.16 $ 0.15
The 2007 Equity Incentive Plan [Member]    
Options outstanding, balance (in shares) 1,157,500 1,564,085
Weighted average exercise price, balance (in dollars per share) $ 0.53 $ 0.61
Options outstanding, balance (in shares) 380,000 1,157,500
Weighted average exercise price, balance (in dollars per share) $ 0.63 $ 0.53
Weighted average remaining term, balance (Year) 1 year 1 year
Aggregate intrinsic Value, Balance [1] $ 0
Options outstanding, Expired (in shares) (777,500) (406,585)
Weighted average exercise price per share, Expired (in dollars per share) $ 0.48 $ 0.61
Non Plan [Member]    
Options outstanding, balance (in shares) 15,687,642 17,375,044
Weighted average exercise price, balance (in dollars per share) $ 0.4 $ 0.39
Options outstanding, Granted (in shares) 444,921 85,251
Weighted average exercise price, Granted (in dollars per share) $ 0.19 $ 0.23
Options outstanding, balance (in shares) 14,039,129 15,687,642
Weighted average exercise price, balance (in dollars per share) $ 0.39 $ 0.4
Weighted average remaining term, balance (Year) 1 year 9 months 18 days  
Aggregate intrinsic Value, Balance [1] $ 35,000  
Options outstanding, Non-vested (in shares) (250,000)  
Weighted average exercise price, Non-vested (in dollars per share) $ 0.18  
Options outstanding, Vested (in shares) 13,789,129  
Weighted average exercise price, Vested (in dollars per share) $ 0.39  
Weighted average remaining term, Vested (Year) 1 year 9 months 18 days  
Aggregate intrinsic Value, vested $ 35,000  
Options Outstanding, Exercised (in shares)   (463,882)
Weighted average exercise price, Exercised (in dollars per share)   $ 0.17
Weighted average exercise price per share, Expired (in dollars per share) $ 0.41 $ 0.46
Options outstanding, Expired (in shares) (2,093,434) (1,308,771)
[1] Aggregate intrinsic value based on closing common stock price of $0.21 at June 30, 2025.