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Note 6 - Goodwill and Other Intangible Assets - Goodwill (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Goodwill, net |  | $ 30,538,000 | $ 58,538,000 |
Goodwill impairment |  | (28,000,000) | (479,000) |
Lighting Segment [Member] |  |  |  |
Goodwill |  | 94,564,000 | 94,564,000 |
Accumulated impairment losses |  | (65,191,000) | (37,191,000) |
Goodwill, net |  | 29,373,000 | 57,373,000 |
Goodwill impairment | $ (28,000,000) | (28,000,000) |  |
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 |  |  |  |
Technology Segment [Member] |  |  |  |
Goodwill |  | 123,254,000 | 123,254,000 |
Accumulated impairment losses |  | (92,716,000) | (64,716,000) |
Goodwill, net |  | 30,538,000 | $ 58,538,000 |
Goodwill impairment |  | $ (28,000,000) |  |

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