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Note 7 - Goodwill and Other Intangible Assets - Goodwill (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Jun. 30, 2017
Goodwill, net | $ 30,538,000 |  | $ 30,538,000 |  | $ 58,538,000
Total Gains (Losses) | (28,000,000) |  | (28,000,000) |  |
Lighting Segment [Member] |  |  |  |  |
Goodwill | 94,564,000 |  | 94,564,000 |  | 94,564,000
Accumulated impairment losses | (65,191,000) |  | (65,191,000) |  | (37,191,000)
Goodwill, net | 29,373,000 |  | 29,373,000 |  | 57,373,000
Total Gains (Losses) | (28,000,000) |  |  |  |
Graphics Segment [Member] |  |  |  |  |
Goodwill | 28,690,000 |  | 28,690,000 |  | 28,690,000
Accumulated impairment losses | (27,525,000) |  | (27,525,000) |  | (27,525,000)
Goodwill, net | 1,165,000 |  | 1,165,000 |  | 1,165,000
Total Gains (Losses) |  |  |  |  |
Technology Segment [Member] |  |  |  |  |
Goodwill | 123,254,000 |  | 123,254,000 |  | 123,254,000
Accumulated impairment losses | (92,716,000) |  | (92,716,000) |  | (64,716,000)
Goodwill, net | 30,538,000 |  | $ 30,538,000 |  | $ 58,538,000
Total Gains (Losses) | $ (28,000,000) |  |  |  |

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