Note 3 - Discontinued Operations - Summary of Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Gain on sale of subsidiary interests			$ 6,986	$ (0)
Total current assets	$ 15,712		15,712		$ 25,347
Total noncurrent assets	4,483		4,483		4,773
Loss before income tax	(2,771)	$ (1,438)	(6,003)	(2,646)
Income tax expense	0	0	0	0
Total current liabilities	9,619		9,619		8,813
Gain on sale of subsidiary interests	0	0	6,986	0
Total noncurrent liabilities	4,986		4,986		6,197
Net income (loss) from discontinued operations	(2,771)	(1,438)	983	(2,646)
Seed [Member]
Revenue	500	500	1,000	1,000
Net cash used in discontinued operating activities			(5,790)	(6,888)
Fair value of consideration received	7,354		7,354
Cash and cash equivalents	13,583		13,583		13,125
Net cash provided by discontinued investing activities			9,800	0
Less: Adjustments to noncontrolling interests (6.75% of the equity interests)			368
Short-term investments	2,000		2,000		12,044
Gain on sale of subsidiary interests			6,986
Research and development	(2,498)	(1,425)	(5,487)	(2,599)
Net cash provided by discontinued financing activities			0	0
Advances to suppliers	68		68		86
Prepaid expenses and other current assets	61		61		92
General and administrative	(862)	(565)	(1,726)	(1,128)
Total current assets	15,712		15,712		25,347
Property and equipment, net	1,255		1,255		1,323
Loss from operations	(2,860)	(1,490)	(6,213)	(2,727)
Operating right-of-use assets	2,934		2,934		3,182
Other noncurrent assets	294		294		268
Foreign exchange gain, net	1	0	1	0
Total noncurrent assets	4,483		4,483		4,773
Total assets	20,195		20,195		30,120
Interest income	46	3	114	7
Short-term loans	3,985		3,985		3,911
Other income, net	42	49	95	74
Accounts payable	285		285		505
Accrued expenses	2,183		2,183		1,354
Loss before income tax	(2,771)	(1,438)	(6,003)	(2,646)
Current portion of operating lease liabilities	415		415		400
Deferred revenue	2,001		2,001		2,001
Income tax expense	0	0	0	0
Other current liabilities	750		750		642
Total current liabilities	9,619		9,619		8,813
Loss from discontinued operations before disposal	(2,771)	(1,438)	(6,003)	(2,646)
Operating lease liabilities	2,165		2,165		2,375
Deferred revenue	2,821		2,821		3,822
Gain on sale of subsidiary interests	0	0	6,986	0
Total noncurrent liabilities	4,986		4,986		6,197
Total liabilities	14,605		14,605		$ 15,010
Net income (loss) from discontinued operations	$ (2,771)	$ (1,438)	$ 983	$ (2,646)