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Note 2 - Summary of Significant Accounting Policies - Fair Value of Goodwill (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Total Gains (Losses) | $ (28,000,000) |  | $ (28,000,000) |
Lighting Segment [Member] |  |  |  |
Total Gains (Losses) | (28,000,000) |  |  |
Fair Value, Measurements, Nonrecurring [Member] | Lighting Segment [Member] |  |  |  |
Goodwill | 29,373,000 |  | 29,373,000 |
Total Gains (Losses) |  |  | (28,000,000) |
Fair Value, Measurements, Nonrecurring [Member] | Lighting Segment [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Goodwill |  |  |  |
Fair Value, Measurements, Nonrecurring [Member] | Lighting Segment [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Goodwill |  |  |  |
Fair Value, Measurements, Nonrecurring [Member] | Lighting Segment [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Goodwill | $ 29,373,000 |  | $ 29,373,000 |

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- Definition Fair value portion of asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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