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Note 11 - Segment Information - Operating Information by Geographic Area (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Net sales | $ 14,276 | $ 14,124 | $ 43,897 | $ 45,476
Income (loss) from operations | 479 | 668 | 1,084 | (597)
Other income (expense), net | (53) | 385 | (92) | 603
Income before income taxes | 426 | 1,053 | 992 | 6
Operating Segments [Member] |  |  |  |
Income (loss) from operations | 2,568 | 2,790 | 7,753 | 6,065
Intersegment Eliminations [Member] |  |  |  |
Income (loss) from operations | (2,089) | (2,122) | (6,669) | (6,662)
CHINA |  |  |  |
Net sales | 501 | 640 | 1,596 | 2,156
CHINA | Operating Segments [Member] |  |  |  |
Income (loss) from operations | 5 | 134 | 51 | 64
Russia and Kazakhstan [Member] |  |  |  |
Net sales | 199 | 190 | 622 | 602
Russia and Kazakhstan [Member] | Operating Segments [Member] |  |  |  |
Income (loss) from operations | 5 | (59) | (101) | (37)
Primary Reporting Segment [Member] |  |  |  |
Net sales | 13,576 | 13,294 | 41,679 | 42,718
Primary Reporting Segment [Member] | Operating Segments [Member] |  |  |  |
Income (loss) from operations | $ 2,558 | $ 2,715 | $ 7,803 | $ 6,038

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