Note 6 - Fair Value of Financial Instruments - Changes in Derivative Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2026	Jun. 30, 2026	Mar. 31, 2026	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025
Measurement	$ 54	$ 41	$ 45	$ 121	$ 101	$ 224
Change in fair value	(10)	13	(4)	(34)	20	(123)
Measurement	44	54	41	87	121	101
Notes Warrants [Member]
Measurement	54	37	41	107	90	197
Change in fair value	(10)	17	(4)	(29)	17	(107)
Measurement	44	54	37	78	107	90
Additional Warrants [Member]
Measurement	0	4	4	14	11	27
Change in fair value	0	(4)	0	(5)	3	(16)
Measurement	$ 0	$ 0	$ 4	$ 9	$ 14	$ 11