v3.26.1
Note 10 - Equity Incentive Plans - Summary of Stock Option Transactions (Details) - $ / shares
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Shares available for grant, balance (in shares) 10,875,110 19,650,124 19,650,124 5,685,806
Number of options outstanding, beginning balance (in shares) 25,407,299 20,405,239 20,405,239 17,938,726
Weighted average exercise price, balance (in dollars per share) $ 1.96 $ 2.49 $ 2.49 $ 2.9
Shares available for grant, granted (in shares) (7,990,020)   (12,969,746) (7,258,980)
Number of options outstanding, granted (in shares) 5,280,640   8,281,792 5,309,437
Weighted average exercise price, granted (in dollars per share) $ 0.68   $ 0.53 $ 1.12
Number of options outstanding, exercised (in shares) 0 (3,625) (3,625) (38,030)
Weighted average exercise price, exercised (in dollars per share) $ 0   $ 0.78 $ 0.78
Shares available for grant, forfeited (in shares) 743,521   2,781,683 1,944,001
Number of options outstanding, forfeited (in shares) (418,889)   (1,851,977) (1,483,826)
Weighted average exercise price, forfeited (in dollars per share) $ 0.88   $ 0.94 $ 2.29
Shares available for grant, canceled (in shares) 2,491,495   1,413,049 1,279,297
Number of options outstanding, canceled (in shares) (2,501,431)   (1,424,130) (1,321,068)
Weighted average exercise price, canceled (in dollars per share) $ 3.19   $ 2.47 $ 2.87
Shares available for grant, balance (in shares) 6,120,106   10,875,110 19,650,124
Number of options outstanding, balance (in shares) 27,767,619   25,407,299 20,405,239
Weighted average exercise price, balance (in dollars per share) $ 1.62   $ 1.96 $ 2.49
The 2024 Inducement Award Plan [Member]        
Authorized (in shares)       3,000,000
The 2019 Plan [Member]        
Authorized (in shares)       15,000,000
Restricted Stock Units (RSUs) [Member]        
Number of RSUs outstanding (in shares) 5,733,306 3,016,481 3,016,481 2,126,373
Balance, Weighted average grant date fair value (in dollars per share) $ 0.7 $ 1.19 $ 1.19 $ 1.37
Number of RSUs outstanding, granted (in shares) 2,709,380   4,687,954 1,949,543
Granted, Weighted average grant date fair value (in dollars per share) $ 0.68   $ 0.51 $ 1.13
Number of RSUs outstanding, release (in shares) (1,426,449)     (599,260)
Released, Weighted average grant date fair value (in dollars per share) $ 0.77     $ 1.48
Number of RSUs outstanding, forfeite (in shares) (324,632)   (929,706) (460,175)
Forfeited, Weighted average grant date fair value (in dollars per share) $ 0.93   $ 0.83 $ 1.41
Number of RSUs outstanding (in shares) 6,691,605   5,733,306 3,016,481
Balance, Weighted average grant date fair value (in dollars per share) $ 0.67   $ 0.7 $ 1.19