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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.

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