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Note 12 - Segment Information - Operating Information by Geographic Area (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Net sales | $ 62,071 | $ 77,614
Income (loss) from operations | 669 | (7,023)
Other income, net | 821 | 1,426
Income (loss) before income taxes | 1,490 | (5,597)
Operating Segments [Member] |  |
Income (loss) from operations | 9,511 | 7,505
Intersegment Eliminations [Member] |  |
Income (loss) from operations | (8,842) | (14,528)
CHINA |  |
Net sales | 2,940 | 2,941
CHINA | Operating Segments [Member] |  |
Income (loss) from operations | 330 | (1,719)
Russia and Kazakhstan [Member] |  |
Net sales | 888 | 980
Russia and Kazakhstan [Member] | Operating Segments [Member] |  |
Income (loss) from operations | (96) | (115)
Primary Reporting Segment [Member] |  |
Net sales | 58,243 | 73,693
Primary Reporting Segment [Member] | Operating Segments [Member] |  |
Income (loss) from operations | $ 9,277 | $ 9,339

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