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Note 3 - Segment Reporting Information - Summarized Financial Information by Reportable Business Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Net Sales: |  |  |  |
Net sales | $ 87,466 | $ 84,159 |  |
Operating Income (Loss): |  |  |  |
Operating income (loss) | (24,814) | 1,066 |  |
Capital Expenditures: |  |  |  |
Capital expenditures | 498 | 1,960 | $ 498 | $ 1,960
Depreciation and Amortization: |  |  |  |
Depreciation and amortization | 2,572 | 1,835 | $ 2,572 | $ 1,835
Corporate and Eliminations [Member] |  |  |  |
Operating Income (Loss): |  |  |  |
Operating income (loss) | (3,360) | (3,042) |  |
Capital Expenditures: |  |  |  |
Capital expenditures | 55 | 498 |  |
Depreciation and Amortization: |  |  |  |
Depreciation and amortization | 292 | 283 |  |
Lighting Segment [Member] |  |  |  |
Net Sales: |  |  |  |
Net sales | 68,428 | 65,265 |  |
Lighting Segment [Member] | Operating Segments [Member] |  |  |  |
Operating Income (Loss): |  |  |  |
Operating income (loss) | (22,930) | 3,091 |  |
Capital Expenditures: |  |  |  |
Capital expenditures | 261 | 1,096 |  |
Depreciation and Amortization: |  |  |  |
Depreciation and amortization | 1,901 | 1,192 |  |
Graphics Segment [Member] |  |  |  |
Net Sales: |  |  |  |
Net sales | 19,038 | 18,894 |  |
Graphics Segment [Member] | Operating Segments [Member] |  |  |  |
Operating Income (Loss): |  |  |  |
Operating income (loss) | 1,476 | 1,017 |  |
Capital Expenditures: |  |  |  |
Capital expenditures | 182 | 366 |  |
Depreciation and Amortization: |  |  |  |
Depreciation and amortization | $ 379 | $ 360 |  |

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