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Note 6 - China Joint Venture - Schedule of Assets and Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Cash and cash equivalents $ 31,011 $ 31,741
Prepaid expenses and other current assets 1,510 1,655
Property and equipment, net 1,910 1,987
Accounts payable 2,305 2,615
Accrued expenses and other current liabilities 6,831 7,751
Corporate Joint Venture [Member]    
Cash and cash equivalents 8 13
Prepaid expenses and other current assets 55 54
Property and equipment, net 243 247
Accounts payable 5 8
Accrued expenses and other current liabilities $ 11 $ 33