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Note 7 - Goodwill and Other Intangible Assets (Details Textual) $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 01, 2022 USD ($) | Jun. 30, 2022 | Jun. 30, 2021 | Mar. 31, 2021 USD ($) | Mar. 01, 2021 USD ($)
Number of Reporting Units | 3 | 3 | 2 |  |
Intangible Assets, Indefinite-lived, Amount of Fair Value in Excess of Carrying Amount |  |  |  | $ 15.7 |
Intangible Assets, Indefinite-lived, Percentage of Fair Value in Excess of Carrying Amount |  |  |  | 358.00% |
First Indefinite Lived Intangible Asset [Member] |  |  |  |  |
Intangible Assets, Indefinite-lived, Amount of Fair Value in Excess of Carrying Amount | $ 17.0 |  |  |  |
Intangible Assets, Indefinite-lived, Percentage of Fair Value in Excess of Carrying Amount | 396.00% |  |  |  |
Second Indefinite Lived Intangible Asset [Member] |  |  |  |  |
Intangible Assets, Indefinite-lived, Amount of Fair Value in Excess of Carrying Amount | $ 10.6 |  |  |  |
Intangible Assets, Indefinite-lived, Percentage of Fair Value in Excess of Carrying Amount | 22.00% |  |  |  |
Lighting Segment [Member] |  |  |  |  |
Number of Reporting Units | 1 |  |  |  |
Reporting Unit, Amount of Fair Value in Excess of Carrying Amount | $ 31.6 |  |  |  | $ 28.2
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount | 18.00% |  |  |  | 26.00%
Display Solutions Segment [Member] |  |  |  |  |
Reporting Unit, Amount of Fair Value in Excess of Carrying Amount |  |  |  |  | $ 11.4
Reporting Units, Percentage of Fair Value in Excess of Carrying Amount |  |  |  |  | 2065.00%
Display Solutions Segment [Member] | First Reporting Unit [Member] |  |  |  |  |
Reporting Unit, Amount of Fair Value in Excess of Carrying Amount | $ 12.2 |  |  |  |
Reporting Units, Percentage of Fair Value in Excess of Carrying Amount | 1316.00% |  |  |  |
Display Solutions Segment [Member] | Second Reporting Unit [Member] |  |  |  |  |
Reporting Unit, Amount of Fair Value in Excess of Carrying Amount | $ 100.4 |  |  |  |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount | 12.00% |  |  |  |

X
- Definition Amount of fair value of indefinite lived intangible assets in excess of carrying amount. + References No definition available. + Details
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X
- Definition Percentage of fair value of indefinite lives intangible assets in excess of carrying amount. + References No definition available. + Details
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X
- Definition Percentage of fair value of reporting unit in excess of carrying amount. + References No definition available. + Details
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X
- Definition Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment. + References No definition available. + Details
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