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Note 11 - Segment Information and Foreign Operations - Reconciliation of Long-lived Assets by Geographic Region (Details) - USD ($)
Sep. 30, 2025
Dec. 31, 2024
Long lived assets $ 161,386 $ 162,200
North America [Member]    
Long lived assets 1,115,000 1,353,000
CHINA    
Long lived assets $ 160,271,000 $ 160,847,000