Note 2 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Revenue	$ 111,143	$ 76,387	$ 217,540	$ 146,393
Lighting Segment [Member]
Revenue	57,276	45,126	108,536	90,531
Lighting Segment [Member] | LED Lighting, Digital Signage, Electronic Circuit Boards [Member]
Revenue	47,626	40,514	89,505	78,383
Lighting Segment [Member] | Poles, Other Display Solution Elements [Member]
Revenue	9,079	4,154	18,045	11,228
Lighting Segment [Member] | Project Management, Installation Services, Shipping and Handling [Member]
Revenue	571	458	986	920
Display Solutions Segment [Member]
Revenue	53,867	31,261	109,004	55,862
Display Solutions Segment [Member] | LED Lighting, Digital Signage, Electronic Circuit Boards [Member]
Revenue	12,551	6,870	24,979	11,951
Display Solutions Segment [Member] | Poles, Other Display Solution Elements [Member]
Revenue	31,127	15,392	64,429	29,717
Display Solutions Segment [Member] | Project Management, Installation Services, Shipping and Handling [Member]
Revenue	10,189	8,999	19,596	14,194
Transferred at Point in Time [Member] | Lighting Segment [Member]
Revenue	50,141	39,941	94,723	79,981
Transferred at Point in Time [Member] | Display Solutions Segment [Member]
Revenue	35,437	15,987	72,868	30,441
Transferred over Time [Member] | Lighting Segment [Member]
Revenue	7,135	5,185	13,813	10,550
Transferred over Time [Member] | Display Solutions Segment [Member]
Revenue	$ 18,430	$ 15,274	$ 36,136	$ 25,421