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Note 6 - China Joint Venture - Schedule of Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Cash and cash equivalents $ 25,135 $ 31,741
Prepaid expenses and other current assets 1,513 1,655
Property and equipment, net 2,390 1,987
Accounts payable 3,220 2,615
Accrued expenses and other current liabilities 7,344 7,751
Corporate Joint Venture [Member]    
Cash and cash equivalents 373 13
Prepaid expenses and other current assets 122 54
Property and equipment, net 231 247
Accounts payable 116 8
Accrued expenses and other current liabilities $ 115 $ 33