Note 5 - Leases (Details Textual)	3 Months Ended
	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($) ft²
Operating Lease, Payments | $	$ 345,000	$ 322,000
HONG KONG
Area of Land (Square Foot)		7,300
Rolling Hills Estates [Member]
Area of Land (Square Foot)		4,900
Richmond, British Columbia [Member]
Area of Land (Square Foot)		1,600
Metuchen, New Jersey [Member]
Area of Land (Square Foot)		2,000
CHINA
Lessee, Number of Branches		7