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Note 10 - Segment Information - Net Sales by Geographic Area (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Net sales |  | $ 16,404 | $ 23,428 | $ 31,352 | $ 42,756
UNITED STATES |  |  |  |  |
Net sales |  | 372 | 514 | 863 | 1,055
CANADA |  |  |  |  |
Net sales |  | 143 | 210 | 404 | 496
PERU |  |  |  |  |
Net sales |  | 238 | 669 | 598 | 1,357
HONG KONG |  |  |  |  |
Net sales | [1] | 13,693 | 19,524 | 25,106 | 34,890
CHINA |  |  |  |  |
Net sales |  | 818 | 557 | 1,516 | 1,613
TAIWAN, PROVINCE OF CHINA |  |  |  |  |
Net sales |  | 550 | 1,057 | 1,490 | 1,691
KOREA, REPUBLIC OF |  |  |  |  |
Net sales |  | 41 | 84 | 168 | 190
Russia and Kazakhstan [Member] |  |  |  |  |
Net sales |  | 170 | 200 | 412 | 418
Europe [Member] |  |  |  |  |
Net sales |  | 255 | 331 | 488 | 674
Other Foreign Countries [Member] |  |  |  |  |
Net sales |  | $ 124 | $ 282 | $ 307 | $ 372
[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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