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Note 6 - Goodwill and Other Intangible Assets (Details Textual) |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 01, 2018 USD ($) | Mar. 01, 2017 USD ($) | Mar. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | May 31, 2018 USD ($)
Number of Reporting Units | 3 | 3 |  |  | 3 |  |  |
Goodwill, Impairment Loss |  |  |  |  | $ 28,000,000 | $ 479,000 |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) | $ 0 | $ 0 |  |  |  |  |  |
Intangible Assets, Indefinite-lived, Amount of Fair Value in Excess of Carrying Amount | $ 20,600,000 | $ 15,200,000 |  |  |  |  |  |
Intangible Assets, Indefinite-lived, Percentage of Fair Value in Excess of Carrying Amount | 604.00% | 445.00% |  |  |  |  |  |
Lighting Segment [Member] |  |  |  |  |  |  |  |
Number of Reporting Units |  |  |  |  | 2 |  |  |
Goodwill, Impairment Loss |  |  |  | $ 28,000,000 | $ 28,000,000 |  |  |
Good will Impairment Testing Value Above Carrying Value | $ 21,400,000 | $ 60,000,000 |  |  |  |  |  | $ 13,700,000
Good will Impairment Testing Percent Value Above Carrying Value | 15.00% | 80.00% |  |  |  |  |  | 11.00%
Graphics Segment [Member] |  |  |  |  |  |  |  |
Number of Reporting Units |  |  |  |  | 1 |  |  |
Goodwill, Impairment Loss |  |  |  |  |  |  |  |
Good will Impairment Testing Value Above Carrying Value | $ 3,300,000 | $ 4,200,000 |  |  |  |  |  |
Good will Impairment Testing Percent Value Above Carrying Value | 319.00% | 424.00% |  |  |  |  |  |
Graphics Segment [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |
Impairment of Intangible Assets, Finite-lived |  |  | $ 479,000 |  |  |  |  |
Second Lighting Segment [Member] |  |  |  |  |  |  |  |
Good will Impairment Testing Value Above Carrying Value | $ 16,100,000 | $ 23,200,000 |  |  |  |  |  |
Good will Impairment Testing Percent Value Above Carrying Value | 69.00% | 95.00% |  |  |  |  |  |

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