Note 1 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2024
Net sales	$ 689,397	$ 573,377	$ 469,638
Lighting Segment [Member]
Net sales	266,223	248,357	262,413
Lighting Segment [Member] | Lighting, Poles, and Electronic Components [Member]
Net sales	263,543	245,763	259,477
Lighting Segment [Member] | Signage and Display Products [Member]
Net sales	0	0	0
Lighting Segment [Member] | Project Management, Installation Services, Shipping and Handling [Member]
Net sales	2,680	2,594	2,936
Display Solutions Segment [Member]
Net sales	423,174	325,020	207,225
Display Solutions Segment [Member] | Lighting, Poles, and Electronic Components [Member]
Net sales	0	0	0
Display Solutions Segment [Member] | Signage and Display Products [Member]
Net sales	355,114	259,936	165,125
Display Solutions Segment [Member] | Project Management, Installation Services, Shipping and Handling [Member]
Net sales	68,060	65,084	42,100
Transferred at Point in Time [Member] | Lighting Segment [Member]
Net sales	219,613	208,193	219,820
Transferred at Point in Time [Member] | Display Solutions Segment [Member]
Net sales	368,166	259,432	151,972
Transferred over Time [Member] | Lighting Segment [Member]
Net sales	46,610	40,164	42,593
Transferred over Time [Member] | Display Solutions Segment [Member]
Net sales	$ 55,008	$ 65,588	$ 55,253