Note 1 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Net Sales	$ 573,377	$ 469,638
Lighting Segment [Member]
Net Sales	248,357	262,413
Lighting Segment [Member] | LED Lighting, Digital Signage, Electronic Circuit Boards [Member]
Net Sales	202,552	215,758
Lighting Segment [Member] | Poles, Other Display Solution Elements [Member]
Net Sales	43,211	43,719
Lighting Segment [Member] | Project Management, Installation Services, Shipping and Handling [Member]
Net Sales	2,594	2,936
Lighting Segment [Member] | Transferred at Point in Time [Member]
Net Sales	208,193	219,820
Lighting Segment [Member] | Transferred over Time [Member]
Net Sales	40,164	42,593
Display Solutions Segment [Member]
Net Sales	325,020	207,225
Display Solutions Segment [Member] | LED Lighting, Digital Signage, Electronic Circuit Boards [Member]
Net Sales	26,144	32,521
Display Solutions Segment [Member] | Poles, Other Display Solution Elements [Member]
Net Sales	233,792	132,604
Display Solutions Segment [Member] | Project Management, Installation Services, Shipping and Handling [Member]
Net Sales	65,084	42,100
Display Solutions Segment [Member] | Transferred at Point in Time [Member]
Net Sales	259,432	151,972
Display Solutions Segment [Member] | Transferred over Time [Member]
Net Sales	$ 65,588	$ 55,253