Note 6 - Goodwill and Other Intangible Assets (Details Textual) $ in Millions			12 Months Ended
	Mar. 01, 2023 USD ($)	Mar. 01, 2022 USD ($)	Jun. 30, 2023	Jun. 30, 2022
Number of Reporting Units	3	3	3	2
First Indefinite Lived Intangible Asset [Member]
Intangible Assets, Indefinite-lived, Amount of Fair Value in Excess of Carrying Amount	$ 17.0	$ 17.0
Intangible Assets, Indefinite-lived, Percentage of Fair Value in Excess of Carrying Amount	399.00%	396.00%
Second Indefinite Lived Intangible Asset [Member]
Intangible Assets, Indefinite-lived, Amount of Fair Value in Excess of Carrying Amount	$ 10.5	$ 10.6
Intangible Assets, Indefinite-lived, Percentage of Fair Value in Excess of Carrying Amount	21.00%	22.00%
Lighting Segment [Member]
Number of Reporting Units	1
Reporting Unit, Amount of Fair Value in Excess of Carrying Amount	$ 34.4	$ 31.6
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount	21.00%	18.00%
Display Solutions Segment [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] | First Reporting Unit [Member]
Reporting Unit, Amount of Fair Value in Excess of Carrying Amount	$ 13.6
Reporting Units, Percentage of Fair Value in Excess of Carrying Amount	5426.00%
Display Solutions Segment [Member] | Second Reporting Unit [Member]
Reporting Unit, Amount of Fair Value in Excess of Carrying Amount	$ 99.4	$ 100.4
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount	15.00%	12.00%