Note 5 - Business Segment Information - Summarized Financial Information by Operating Segments (Details) - USD ($) $ in Thousands		3 Months Ended												12 Months Ended
		Jun. 30, 2026	Mar. 31, 2026	Dec. 31, 2025	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2024
Net sales														$ 689,397	$ 573,377	$ 469,638
Interest expense														(5,928)	(3,129)	(2,156)
Long-term performance based compensation														(3,458)	(3,951)	(3,272)
Amortization expense of acquired intangible assets														(7,220)	(4,745)	(3,671)
Severance costs and restructuring costs														(63)	(240)	(396)
Acquisition costs														(8,340)	(900)	(735)
Lease expense on the step-up basis of acquired leases														(508)	(285)
Foreign currency translation loss on intercompany loan														(329)	489
Tax rate difference between reported and adjusted net income														293	1,132	757
Net income		$ 6,876	$ 2,091	$ 6,348	$ 7,264	$ 8,171	$ 3,883	$ 5,647	$ 6,682	$ 5,668	$ 5,375	$ 5,906	$ 8,028	22,579	24,383	24,977
Capital expenditures														5,142	3,465	5,388
Income tax expense														8,895	8,655	8,122
Depreciation and amortization														16,565	12,575	9,999
Operating and Intersegment [Member]
Net sales														689,397	573,377	469,638
Lighting Segment [Member]
Net sales														266,223	248,357	262,413
Lighting Segment [Member] | Operating and Intersegment [Member]
Net sales														266,223	248,357	262,413
Display Solutions Segment [Member]
Net sales														423,174	325,020	207,225
Display Solutions Segment [Member] | Operating and Intersegment [Member]
Net sales														423,174	325,020	207,225
Operating Segments [Member]
Net sales														705,695	594,246	493,287
Other segment items *	[1]													(621,023)	(524,991)	(422,157)
Adjusted net income														68,374	48,386	47,481
Capital expenditures														5,044	3,382	4,941
Income tax expense														10,126	15,610	11,596
Depreciation and amortization														16,155	12,250	9,647
Operating Segments [Member] | Lighting Segment [Member]
Net sales														281,169	268,332	285,264
Other segment items *	[1]													(236,788)	(222,588)	(233,643)
Adjusted net income														29,435	25,769	28,770
Capital expenditures														2,192	1,883	3,555
Income tax expense														6,064	7,318	7,172
Depreciation and amortization														5,089	5,060	5,167
Operating Segments [Member] | Display Solutions Segment [Member]
Net sales														424,526	325,914	208,023
Other segment items *	[1]													(384,235)	(302,403)	(188,514)
Adjusted net income														38,939	22,617	18,711
Capital expenditures														2,852	1,499	1,386
Income tax expense														4,062	8,292	4,424
Depreciation and amortization														11,066	7,190	4,480
Intersegment Eliminations [Member]
Net sales														(16,298)	(20,869)	(23,649)
Intersegment Eliminations [Member] | Lighting Segment [Member]
Net sales														(14,946)	(19,975)	(22,851)
Intersegment Eliminations [Member] | Display Solutions Segment [Member]
Net sales														(1,352)	(894)	(798)
Corporate and Eliminations [Member]
Capital expenditures														98	83	447
Income tax expense														(1,231)	(6,955)	(3,474)
Depreciation and amortization														410	325	352
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Adjusted net income														$ (20,242)	$ (12,374)	$ (13,031)

[1] Costs of products and services sold, selling and administrative expenses, other income and expense and income tax expense.