Note 10 - Equity Incentive Plans - Summary of Stock Option Transactions (Details) - $ / shares	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Shares available for grant, balance (in shares)	10,875,110
Number of options outstanding, beginning balance (in shares)	25,407,299
Weighted average exercise price, balance (in dollars per share)	$ 1.96
Shares available for grant, granted (in shares)	(7,990,020)
Number of options outstanding, granted (in shares)	5,280,640
Weighted average exercise price, granted (in dollars per share)	$ 0.68
Number of options outstanding, exercised (in shares)	0	(3,625)
Weighted average exercise price, exercised (in dollars per share)	$ 0
Shares available for grant, forfeited (in shares)	743,521
Number of options outstanding, forfeited (in shares)	(418,889)
Weighted average exercise price, forfeited (in dollars per share)	$ 0.88
Shares available for grant, canceled (in shares)	2,491,495
Number of options outstanding, canceled (in shares)	(2,501,431)
Weighted average exercise price, canceled (in dollars per share)	$ 3.19
Shares available for grant, balance (in shares)	6,120,106
Number of options outstanding, balance (in shares)	27,767,619
Weighted average exercise price, balance (in dollars per share)	$ 1.62
Restricted Stock Units (RSUs) [Member]
Number of RSUs outstanding (in shares)	5,733,306
Balance, Weighted average grant date fair value (in dollars per share)	$ 0.7
Number of RSUs outstanding, granted (in shares)	2,709,380
Granted, Weighted average grant date fair value (in dollars per share)	$ 0.68
Number of RSUs outstanding, release (in shares)	(1,426,449)
Released, Weighted average grant date fair value (in dollars per share)	$ 0.77
Number of RSUs outstanding, forfeite (in shares)	(324,632)
Forfeited, Weighted average grant date fair value (in dollars per share)	$ 0.93
Number of RSUs outstanding (in shares)	6,691,605
Balance, Weighted average grant date fair value (in dollars per share)	$ 0.67