Note 2 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Revenue	$ 110,111	$ 72,204	$ 327,651	$ 218,597
Lighting Segment [Member]
Revenue	57,126	45,740	165,662	136,271
Lighting Segment [Member] | LED Lighting, Digital Signage, Electronic Circuit Boards [Member]
Revenue	47,196	40,298	136,701	118,681
Lighting Segment [Member] | Poles, Other Display Solution Elements [Member]
Revenue	9,358	5,071	27,403	16,299
Lighting Segment [Member] | Project Management, Installation Services, Shipping and Handling [Member]
Revenue	572	371	1,558	1,291
Display Solutions Segment [Member]
Revenue	52,985	26,464	161,989	82,326
Display Solutions Segment [Member] | LED Lighting, Digital Signage, Electronic Circuit Boards [Member]
Revenue	6,906	8,595	31,885	20,546
Display Solutions Segment [Member] | Poles, Other Display Solution Elements [Member]
Revenue	35,536	11,809	99,965	41,526
Display Solutions Segment [Member] | Project Management, Installation Services, Shipping and Handling [Member]
Revenue	10,543	6,060	30,139	20,254
Transferred at Point in Time [Member] | Lighting Segment [Member]
Revenue	49,283	39,497	144,006	119,478
Transferred at Point in Time [Member] | Display Solutions Segment [Member]
Revenue	41,231	12,550	114,099	42,991
Transferred over Time [Member] | Lighting Segment [Member]
Revenue	7,843	6,243	21,656	16,793
Transferred over Time [Member] | Display Solutions Segment [Member]
Revenue	$ 11,754	$ 13,914	$ 47,890	$ 39,335