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%