Note 2 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Revenue	$ 106,397	$ 70,006
Lighting Segment [Member]
Revenue	51,260	45,405
Lighting Segment [Member] | LED Lighting, Digital Signage, Electronic Circuit Boards [Member]
Revenue	41,879	37,869
Lighting Segment [Member] | Poles, Other Display Solution Elements [Member]
Revenue	8,966	7,074
Lighting Segment [Member] | Project Management, Installation Services, Shipping and Handling [Member]
Revenue	415	462
Display Solutions Segment [Member]
Revenue	55,137	24,601
Display Solutions Segment [Member] | LED Lighting, Digital Signage, Electronic Circuit Boards [Member]
Revenue	12,428	5,081
Display Solutions Segment [Member] | Poles, Other Display Solution Elements [Member]
Revenue	33,302	14,325
Display Solutions Segment [Member] | Project Management, Installation Services, Shipping and Handling [Member]
Revenue	9,407	5,195
Transferred at Point in Time [Member] | Lighting Segment [Member]
Revenue	44,582	40,040
Transferred at Point in Time [Member] | Display Solutions Segment [Member]
Revenue	37,431	14,454
Transferred over Time [Member] | Lighting Segment [Member]
Revenue	6,678	5,365
Transferred over Time [Member] | Display Solutions Segment [Member]
Revenue	$ 17,706	$ 10,147