Note 7 - Goodwill and Other Intangible Assets (Details Textual) $ in Thousands		12 Months Ended
	Mar. 01, 2020 USD ($)	Jun. 30, 2021 USD ($)	May 21, 2021 USD ($)	Mar. 31, 2021 USD ($)	Mar. 01, 2021 USD ($)	Jun. 30, 2020 USD ($)
Number of Reporting Units		2
Intangible Assets, Indefinite-lived, Amount of Fair Value in Excess of Carrying Amount	$ 16,800			$ 15,700
Intangible Assets, Indefinite-lived, Percentage of Fair Value in Excess of Carrying Amount	392.00%			358.00%
Goodwill, Ending Balance		$ 43,788				$ 10,373
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	$ 0
JSI Store Fixtures [Member]
Goodwill, Ending Balance			$ 33,415
Lighting Segment [Member]
Number of Reporting Units		1
Reporting Unit, Amount of Fair Value in Excess of Carrying Amount					$ 28,200
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount					26.00%
Goodwill, Ending Balance		$ 9,208				9,208
Good will Impairment Testing Value Above Carrying Value	$ 31,600
Good will Impairment Testing Percent Value Above Carrying Value	33.00%
Display Solutions Segment [Member]
Reporting Unit, Amount of Fair Value in Excess of Carrying Amount					$ 11,400
Reporting Units, Percentage of Fair Value in Excess of Carrying Amount					2065.00%
Goodwill, Ending Balance		$ 34,580				$ 1,165
Good will Impairment Testing Value Above Carrying Value	$ 4,700
Good will Impairment Testing Percent Value Above Carrying Value	619.00%