Note 2 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Net Sales	$ 132,481	$ 108,186	$ 418,310	$ 340,632
Lighting Segment [Member]
Net Sales	58,967	64,882	175,614	197,318
Lighting Segment [Member] | LED Lighting, Digital Signage, Electronic Circuit Boards [Member]
Net Sales	48,403	53,917	143,412	162,524
Lighting Segment [Member] | Poles, Other Display Solution Elements [Member]
Net Sales	9,960	10,181	30,298	32,532
Lighting Segment [Member] | Project Management, Installation Services, Shipping and Handling [Member]
Net Sales	604	784	1,904	2,262
Lighting Segment [Member] | Transferred at Point in Time [Member]
Net Sales	49,258	53,619	145,835	165,890
Lighting Segment [Member] | Transferred over Time [Member]
Net Sales	9,709	11,263	29,779	31,428
Display Solutions Segment [Member]
Net Sales	73,514	43,304	242,696	143,314
Display Solutions Segment [Member] | LED Lighting, Digital Signage, Electronic Circuit Boards [Member]
Net Sales	3,867	8,321	21,613	26,045
Display Solutions Segment [Member] | Poles, Other Display Solution Elements [Member]
Net Sales	54,592	26,628	171,021	86,326
Display Solutions Segment [Member] | Project Management, Installation Services, Shipping and Handling [Member]
Net Sales	15,055	8,355	50,062	30,943
Display Solutions Segment [Member] | Transferred at Point in Time [Member]
Net Sales	60,215	30,304	190,355	99,560
Display Solutions Segment [Member] | Transferred over Time [Member]
Net Sales	$ 13,299	$ 13,000	$ 52,341	$ 43,754