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Note 11 - Segment Information - Operating Information 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
Income (loss) from operations | 385 | 183 | 605 | (1,265)
Other income (expense), net | (59) | 125 | (39) | 218
Income (loss) before income taxes | 326 | 308 | 566 | (1,047)
Operating Segments [Member] |  |  |  |
Income (loss) from operations | 2,541 | 2,125 | 5,185 | 3,275
Intersegment Eliminations [Member] |  |  |  |
Income (loss) from operations | (2,156) | (1,942) | (4,580) | (4,540)
CHINA |  |  |  |
Net sales | 587 | 818 | 1,095 | 1,516
CHINA | Operating Segments [Member] |  |  |  |
Income (loss) from operations | 53 | 13 | 46 | (70)
Russia and Kazakhstan [Member] |  |  |  |
Net sales | 232 | 170 | 423 | 412
Russia and Kazakhstan [Member] | Operating Segments [Member] |  |  |  |
Income (loss) from operations | (58) | 104 | (106) | 22
Primary Reporting Segment [Member] |  |  |  |
Net sales | 15,333 | 15,416 | 28,103 | 29,424
Primary Reporting Segment [Member] | Operating Segments [Member] |  |  |  |
Income (loss) from operations | $ 2,546 | $ 2,008 | $ 5,245 | $ 3,323

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