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Note 5 - Share-based Compensation - Stock Options (Details)
 6 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
$ / shares
shares
Sep. 30, 2025
USD ($)
$ / shares
shares
Sep. 30, 2024
USD ($)
$ / shares
shares
2024 Equity Incentive Plan [Member]      
Options outstanding, balance (in shares) | shares   5,493,920 0
Weighted average exercise price, balance (in dollars per share)   $ 0.23 $ 0
Options outstanding, Granted (in shares) | shares   8,985,536 3,482,270
Weighted average exercise price, Granted (in dollars per share)   $ 0.21 $ 0.25
Unvested (in shares) | shares (4,443,293) (4,443,293) (1,261,982)
Weighted average exercise price per share, unvested (in dollars per share) $ 0.21 $ 0.21 $ 0.24
Aggregate intrinsic value, Vested | $ $ 0 $ 0 [1]
Weighted average remaining term, Outstanding (Year) 9 years 2 months 12 days    
Aggregate intrinsic Value, Balance | $ $ 0 [1] $ 0 [1]  
Vested balance (in shares) | shares 10,036,163 10,036,163 2,220,288
Weighted average exercise price, Vested (in dollars per share) $ 0.22 $ 0.22 $ 0.25
Weighted average remaining term, Vested (Year) 9 years 2 months 12 days    
Options outstanding, Vested (in shares) | shares 10,036,163 10,036,163 2,220,288
Weighted average exercise price, Vested (in dollars per share) $ 0.22 $ 0.22 $ 0.25
Options outstanding, balance (in shares) | shares 14,479,456 14,479,456 3,482,270
Weighted average exercise price, balance (in dollars per share) $ 0.21 $ 0.21 $ 0.25
2018 Equity Incentive Plan [Member]      
Options outstanding, balance (in shares) | 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) | shares     1,547,938
Weighted average exercise price, Granted (in dollars per share)     $ 0.3
Unvested (in shares) | shares (1,946,350) (1,946,350) (3,623,430)
Weighted average exercise price per share, unvested (in dollars per share) $ 0.23 $ 0.23 $ 0.22
Aggregate intrinsic value, Vested | $ $ 279,000 [1] $ 279,000 [1]  
Weighted average remaining term, Outstanding (Year)   6 years 1 month 6 days  
Aggregate intrinsic Value, Balance | $ $ 279,000 [1] $ 279,000 [1]  
Vested balance (in shares) | shares 39,658,085 39,658,085 38,547,956
Weighted average exercise price, Vested (in dollars per share) $ 0.19 $ 0.19 $ 0.19
Weighted average remaining term, Vested (Year)   6 years  
Options Outstanding, Exercised (in shares) | shares   (566,951) (485,000)
Weighted average exercise price, Exercised (in dollars per share)   $ 0.16 $ 0.15
Options outstanding, Vested (in shares) | shares 39,658,085 39,658,085 38,547,956
Weighted average exercise price, Vested (in dollars per share) $ 0.19 $ 0.19 $ 0.19
Options outstanding, balance (in shares) | shares 41,604,435 41,604,435 42,171,386
Weighted average exercise price, balance (in dollars per share) $ 0.19 $ 0.19 $ 0.19
The 2007 Equity Incentive Plan [Member]      
Options outstanding, balance (in shares) | shares   1,157,500 1,564,085
Weighted average exercise price, balance (in dollars per share)   $ 0.53 $ 0.61
Weighted average remaining term, Outstanding (Year)   1 year 3 months 18 days  
Aggregate intrinsic Value, Balance | $ $ 0 [1] $ 0 [1]  
Options outstanding, balance (in shares) | shares 380,000 380,000 1,157,500
Weighted average exercise price, balance (in dollars per share) $ 0.63 $ 0.63 $ 0.61
Options outstanding, Expired (in shares) | shares   (777,500) (406,585)
Weighted average exercise price per share, Expired (in dollars per share)     $ 0.61
The 2007 Equity Incentive Plan [Member] | Minimum [Member]      
Weighted average exercise price per share, Expired (in dollars per share)   $ 0.48  
Non Plan [Member]      
Options outstanding, balance (in shares) | 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) | shares   32,143 85,251
Weighted average exercise price, Granted (in dollars per share)   $ 0.28 $ 0.23
Unvested (in shares) | shares (218,750) (218,750) (437,500)
Weighted average exercise price per share, unvested (in dollars per share) $ 0.44 $ 0.44 $ 0.45
Aggregate intrinsic value, Vested | $ $ 22,000 [1] $ 22,000 [1]  
Weighted average remaining term, Outstanding (Year)   2 years 1 month 6 days  
Vested balance (in shares) | shares 13,707,601 13,707,601 15,693,714
Weighted average exercise price, Vested (in dollars per share) $ 0.39 $ 0.39 $ 0.39
Weighted average remaining term, Vested (Year) 2 years 1 month 6 days    
Options Outstanding, Exercised (in shares) | shares     (463,882)
Weighted average exercise price, Exercised (in dollars per share)     $ 0.17
Options outstanding, Vested (in shares) | shares 13,707,601 13,707,601 15,693,714
Weighted average exercise price, Vested (in dollars per share) $ 0.39 $ 0.39 $ 0.39
Options outstanding, balance (in shares) | shares 13,926,351 13,926,351 16,131,214
Weighted average exercise price, balance (in dollars per share) $ 0.4 $ 0.4 $ 0.39
Weighted average exercise price per share, Expired (in dollars per share)   $ 0.39 $ 0.51
Options outstanding, Expired (in shares) | shares   (1,793,434) (865,199)
Aggregate intrinsic value, balance | $ $ 22,000 [1] $ 22,000 [1]  
[1] Aggregate intrinsic value based on closing common stock price of $0.21 at June 30, 2025.