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Note 10 - Segment Information - Operating Information 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
Income (loss) from operations | 183 | (4) | (1,265) | (2,713)
Income (loss) from operations | 183 | (4) | (1,265) | (2,713)
Other income, net | 125 | 373 | 218 | 805
Income (loss) before income taxes | 308 | 369 | (1,047) | (1,908)
Operating Segments [Member] |  |  |  |
Income (loss) from operations | 2,125 | 3,255 | 3,275 | 3,741
Income (loss) from operations | 2,125 | 3,255 | 3,275 | 3,741
Intersegment Eliminations [Member] |  |  |  |
Income (loss) from operations | (1,942) | (3,259) | (4,540) | (6,454)
Income (loss) from operations | (1,942) | (3,259) | (4,540) | (6,454)
CHINA |  |  |  |
Net sales | 818 | 557 | 1,516 | 1,613
CHINA | Operating Segments [Member] |  |  |  |
Income (loss) from operations | 13 | (424) | (70) | (735)
Income (loss) from operations | 13 | (424) | (70) | (735)
Russia and Kazakhstan [Member] |  |  |  |
Net sales | 170 | 200 | 412 | 418
Russia and Kazakhstan [Member] | Operating Segments [Member] |  |  |  |
Income (loss) from operations | 104 | (31) | 22 | (56)
Income (loss) from operations | 104 | (31) | 22 | (56)
Primary Reporting Segment [Member] |  |  |  |
Net sales | 15,416 | 22,671 | 29,424 | 40,725
Primary Reporting Segment [Member] | Operating Segments [Member] |  |  |  |
Income (loss) from operations | 2,008 | 3,710 | 3,323 | 4,532
Income (loss) from operations | $ 2,008 | $ 3,710 | $ 3,323 | $ 4,532

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