Note 11 - Segment Information and Foreign Operations - Reconciliation of Long-lived Assets by Geographic Region (Details) - USD ($)	Jun. 30, 2025	Dec. 31, 2024
Long lived assets	$ 161,947	$ 162,200
North America [Member]
Long lived assets	1,208,000	1,353,000
CHINA
Long lived assets	$ 160,739,000	$ 160,847,000