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Note 3 - Discontinued Operations - Summary of Discontinued Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Gain on sale of subsidiary interests $ 6,986 $ (0)  
Total current assets 22,625   $ 25,347
Loss before income tax (3,232) (1,208)  
Income tax expense 0 0  
Total noncurrent assets 4,650   4,773
Gain on sale of subsidiary interests 6,986 0  
Net income (loss) from discontinued operations 3,754 (1,208)  
Total current liabilities 9,733   8,813
Total noncurrent liabilities 5,593   6,197
Seed [Member]      
Revenue 500 500  
Net cash used in discontinued operating activities (2,494) (1,522)  
Fair value of consideration received 7,354    
Cash and cash equivalents 11,631   13,125
Net cash provided by discontinued investing activities 950 0  
Less: Adjustments to noncontrolling interests (6.75% of the equity interests) 368    
Research and development (2,989) (1,174)  
Gain on sale of subsidiary interests 6,986    
Short-term investments 10,807   12,044
Net cash provided by discontinued financing activities 0 0  
General and administrative (864) (563)  
Advances to suppliers 43   86
Loss from operations (3,353) (1,237)  
Prepaid expenses and other current assets 144   92
Interest income 68 4  
Total current assets 22,625   25,347
Other income, net 53 25  
Property and equipment, net 1,314   1,323
Loss before income tax (3,232) (1,208)  
Operating right-of-use assets 3,058   3,182
Income tax expense 0 0  
Other noncurrent assets 278   268
Loss from discontinued operations before disposal (3,232) (1,208)  
Total noncurrent assets 4,650   4,773
Gain on sale of subsidiary interests 6,986 0  
Total assets 27,275   30,120
Net income (loss) from discontinued operations 3,754 $ (1,208)  
Short-term loans 3,934   3,911
Accounts payable 465   505
Accrued expenses 2,110   1,354
Current portion of operating lease liabilities 407   400
Deferred revenue 2,001   2,001
Other current liabilities 816   642
Total current liabilities 9,733   8,813
Operating lease liabilities 2,271   2,375
Deferred revenue 3,322   3,822
Total noncurrent liabilities 5,593   6,197
Total liabilities $ 15,326   $ 15,010