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Note 6 - Goodwill and Other Intangible Assets (Details Textual) |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 01, 2019 USD ($) | Mar. 01, 2018 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2018 USD ($) | Jun. 30, 2019 USD ($) | May 31, 2018 USD ($)
Goodwill, Impairment Loss |  |  |  |  | $ 20,165,000 |  |
Number of Reporting Units |  | 3 |  |  |  | 2 |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) | $ 0 | $ 0 |  |  |  |  |
Intangible Assets, Indefinite-lived, Amount of Fair Value in Excess of Carrying Amount | $ 19,200,000 | $ 20,600,000 |  |  |  |  |
Intangible Assets, Indefinite-lived, Percentage of Fair Value in Excess of Carrying Amount | 462.00% | 604.00% |  |  |  |  |
Lighting Segment [Member] |  |  |  |  |  |  |
Goodwill, Impairment Loss |  |  | $ 20,165,000 | $ 28,000,000 | 20,165,000 |  |
Number of Reporting Units |  |  |  |  |  | 1 |
Good will Impairment Testing Value Above Carrying Value |  | $ 21,400,000 |  |  |  | $ 38,900,000 | $ 13,700,000
Good will Impairment Testing Percent Value Above Carrying Value |  | 15.00% |  |  |  | 54.00% | 11.00%
Graphics Segment [Member] |  |  |  |  |  |  |
Goodwill, Impairment Loss |  |  |  |  |  |  |
Number of Reporting Units |  |  |  |  |  | 1 |
Good will Impairment Testing Value Above Carrying Value |  | $ 3,300,000 |  |  |  | $ 3,000,000 |
Good will Impairment Testing Percent Value Above Carrying Value |  | 319.00% |  |  |  | 297.00% |
Second Lighting Segment [Member] |  |  |  |  |  |  |
Good will Impairment Testing Value Above Carrying Value |  | $ 16,100,000 |  |  |  |  |
Good will Impairment Testing Percent Value Above Carrying Value |  | 69.00% |  |  |  |  |

X
- Definition The percentage by which the estimated business enterprise value is above the carrying value of the reporting unit when tested for impairment. + References No definition available. + Details
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- Definition The amount by which the estimated business enterprise value is above the carrying value of the reporting unit when tested for impairment. + References No definition available. + Details
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