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Note 6 - Goodwill and Other Intangible Assets - Goodwill (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2017 | Dec. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Goodwill |  |  |  | $ 123,254,000 | $ 123,254,000
Accumulated impairment losses |  |  |  | (112,881,000) | (92,716,000)
Goodwill, net |  |  |  | 10,373,000 | 30,538,000
Goodwill impairment |  |  | $ (20,165,000) |  |
Lighting Segment [Member] |  |  |  |  |
Goodwill |  |  |  | 94,564,000 | 94,564,000
Accumulated impairment losses |  |  |  | (85,356,000) | (65,191,000)
Goodwill, net |  |  |  | 9,208,000 | 29,373,000
Goodwill impairment | $ (20,165,000) | $ (28,000,000) | (20,165,000) |  |
Graphics Segment [Member] |  |  |  |  |
Goodwill |  |  |  | 28,690,000 | 28,690,000
Accumulated impairment losses |  |  |  | (27,525,000) | (27,525,000)
Goodwill, net |  |  |  | $ 1,165,000 | $ 1,165,000
Goodwill impairment |  |  |  |  |

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