Note 8 - Interest Expense and Other - Schedule of Interest Expense and Other Nonoperating Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Common stock purchase agreements costs	$ 19	$ 1,136	$ 325	$ 1,136
Debt issuance costs	0	0	2,020	0
Amortization of premiums (accretion of discounts) on marketable securities, net	(79)	(149)	(260)	(590)
Expected credit losses	0	1	2	35
Other	5	114	331	148
Interest expense and other	$ (55)	$ 1,102	$ 2,418	$ 729