Note 2 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Net Sales	$ 108,186	$ 117,470	$ 340,632	$ 373,343
Lighting Segment [Member]
Net Sales	64,882	66,707	197,318	201,074
Lighting Segment [Member] | LED Lighting, Digital Signage, Electronic Circuit Boards [Member]
Net Sales	53,917	55,894	162,524	165,839
Lighting Segment [Member] | Poles, Other Display Solution Elements [Member]
Net Sales	10,181	9,920	32,532	32,681
Lighting Segment [Member] | Project Management, Installation Services, Shipping and Handling [Member]
Net Sales	784	893	2,262	2,554
Display Solutions Segment [Member]
Net Sales	43,304	50,763	143,314	172,269
Display Solutions Segment [Member] | LED Lighting, Digital Signage, Electronic Circuit Boards [Member]
Net Sales	8,321	4,907	26,045	17,883
Display Solutions Segment [Member] | Poles, Other Display Solution Elements [Member]
Net Sales	26,628	37,019	86,326	120,173
Display Solutions Segment [Member] | Project Management, Installation Services, Shipping and Handling [Member]
Net Sales	8,355	8,837	30,943	34,213
Transferred at Point in Time [Member] | Lighting Segment [Member]
Net Sales	53,619	57,249	165,890	173,917
Transferred at Point in Time [Member] | Display Solutions Segment [Member]
Net Sales	30,304	42,378	99,560	136,894
Transferred over Time [Member] | Lighting Segment [Member]
Net Sales	11,263	9,458	31,428	27,157
Transferred over Time [Member] | Display Solutions Segment [Member]
Net Sales	$ 13,000	$ 8,385	$ 43,754	$ 35,375