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Note 7 - Goodwill and Other Intangible Assets (Details Textual) |  | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Mar. 01, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) | Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($)
Number of Reporting Units |  |  | 1 |  |  | 2 |
Goodwill, Impairment Loss |  |  |  |  | $ 20,165,000 | $ 20,165,000 | $ 28,000,000
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) | $ 0 |  |  |  |  |  |
Intangible Assets, Indefinite-lived, Amount of Fair Value in Excess of Carrying Amount | $ 19,200,000 |  |  |  |  |  |
Intangible Assets, Indefinite-lived, Percentage of Fair Value in Excess of Carrying Amount | 462.00% |  |  |  |  |  |
Amortization of Intangible Assets, Total |  | 691,000 |  | $ 691,000 |  | 2,071,000 | $ 2,071,000
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year |  | 2,761,000 |  |  |  | 2,761,000 |
Finite-Lived Intangible Assets, Amortization Expense, Year Two |  | 2,687,000 |  |  |  | 2,687,000 |
Finite-Lived Intangible Assets, Amortization Expense, Year Three |  | 2,682,000 |  |  |  | 2,682,000 |
Finite-Lived Intangible Assets, Amortization Expense, Year Four |  | 2,460,000 |  |  |  | 2,460,000 |
Finite-Lived Intangible Assets, Amortization Expense, Year Five |  | 2,412,000 |  |  |  | 2,412,000 |
Finite-Lived Intangible Assets, Amortization Expense, after Year Five |  | $ 18,985,000 |  |  |  | $ 18,985,000 |
Lighting Segment [Member] |  |  |  |  |  |  |
Number of Reporting Units |  |  |  |  |  | 1 |
Goodwill, Impairment Loss |  |  |  |  | 20,165,000 | $ 20,165,000 |
Good will Impairment Testing Value Above Carrying Value | $ 38,900,000 |  |  |  |  |  |
Good will Impairment Testing Percent Value Above Carrying Value | 54.00% |  |  |  |  |  |
Graphics Segment [Member] |  |  |  |  |  |  |
Number of Reporting Units |  |  |  |  |  | 1 |
Goodwill, Impairment Loss |  |  |  |  |  |  |
Good will Impairment Testing Value Above Carrying Value | $ 3,000,000 |  |  |  |  |  |
Good will Impairment Testing Percent Value Above Carrying Value | 297.00% |  |  |  |  |  |

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