Note 11 - Segment Information - Net Sales by Geographic Area (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net sales		$ 16,152	$ 16,404	$ 29,621	$ 31,352
UNITED STATES
Net sales		328	372	639	863
CANADA
Net sales		170	143	341	404
PERU
Net sales		628	238	1,144	598
HONG KONG
Net sales	[1]	12,704	13,693	23,026	25,106
CHINA
Net sales		587	818	1,095	1,516
TAIWAN, PROVINCE OF CHINA
Net sales		715	550	1,406	1,490
KOREA, REPUBLIC OF
Net sales		83	41	151	168
Russia and Kazakhstan [Member]
Net sales		232	170	423	412
Europe [Member]
Net sales		261	255	611	488
Other Foreign Countries [Member]
Net sales		$ 444	$ 124	$ 785	$ 307

[1] Substantially all of our Hong Kong revenues are derived from the sale of products that are delivered to members in China. See “Item 1A. Risk Factors” in this report and in our most recent Annual Report on Form 10-K.