Note 2 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Revenue	$ 127,069	$ 106,397
Lighting Segment [Member]
Revenue	67,533	51,260
Lighting Segment [Member] | LED Lighting, Digital Signage, Electronic Circuit Boards [Member]
Revenue	55,535	41,879
Lighting Segment [Member] | Poles, Other Display Solution Elements [Member]
Revenue	11,129	8,966
Lighting Segment [Member] | Project Management, Installation Services, Shipping and Handling [Member]
Revenue	869	415
Display Solutions Segment [Member]
Revenue	59,536	55,137
Display Solutions Segment [Member] | LED Lighting, Digital Signage, Electronic Circuit Boards [Member]
Revenue	7,175	12,428
Display Solutions Segment [Member] | Poles, Other Display Solution Elements [Member]
Revenue	41,471	33,302
Display Solutions Segment [Member] | Project Management, Installation Services, Shipping and Handling [Member]
Revenue	10,890	9,407
Transferred at Point in Time [Member] | Lighting Segment [Member]
Revenue	58,077	44,582
Transferred at Point in Time [Member] | Display Solutions Segment [Member]
Revenue	47,489	37,431
Transferred over Time [Member] | Lighting Segment [Member]
Revenue	9,456	6,678
Transferred over Time [Member] | Display Solutions Segment [Member]
Revenue	$ 12,047	$ 17,706