Note 3 - Discontinued Operations - Summary of Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2025	Dec. 31, 2024
Gain on sale of subsidiary interests					$ 6,986	$ (0)
Total current assets					8,023	25,347
Loss before income tax					(12,488)	(7,828)
Income tax expense					0	0
Total noncurrent assets					4,356	4,773
Total current liabilities					11,133	8,813
Total noncurrent liabilities					3,766	6,197
Seed [Member]
Revenue	$ 2,001	$ 2,001
Net cash used in discontinued operating activities			$ (12,314)	$ (7,665)
Fair value of consideration received					7,354
Cash and cash equivalents					4,352	13,125
Research and development	(10,853)	(7,503)
Net cash provided by discontinued investing activities			8,207	(12,012)
Less: Adjustments to noncontrolling interests (6.75% of the equity interests)					368
Short-term investments					3,531	12,044
Gain on sale of subsidiary interests					6,986
General and administrative	(3,929)	(2,660)
Net cash provided by discontinued financing activities			$ 2,980	$ 23,815
Advances to suppliers					117	86
Loss from operations	(12,781)	(8,162)
Prepaid expenses and other current assets					23	92
Foreign exchange gain, net	1	0
Total current assets					8,023	25,347
Interest income	176	149
Property and equipment, net					1,373	1,323
Other income, net	116	185
Operating right-of-use assets					2,683	3,182
Loss before income tax	(12,488)	(7,828)
Other noncurrent assets					300	268
Income tax expense	0	0
Total noncurrent assets					4,356	4,773
Loss from discontinued operations before disposal	$ (12,488)	$ (7,828)
Total assets					12,379	30,120
Short-term loans					4,369	3,911
Accounts payable					361	505
Accrued expenses					3,105	1,354
Current portion of operating lease liabilities					430	400
Deferred revenue					2,001	2,001
Other current liabilities					867	642
Total current liabilities					11,133	8,813
Operating lease liabilities					1,945	2,375
Deferred revenue					1,821	3,822
Total noncurrent liabilities					3,766	6,197
Total liabilities					$ 14,899	$ 15,010