Note 2 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Net Sales	$ 109,005	$ 128,804	$ 232,446	$ 255,873
Lighting Segment [Member]
Net Sales	64,795	66,833	132,436	134,366
Lighting Segment [Member] | LED Lighting, Digital Signage, Electronic Circuit Boards [Member]
Net Sales	53,116	54,410	108,607	109,945
Lighting Segment [Member] | Poles, Other Display Solution Elements [Member]
Net Sales	10,968	11,632	22,351	22,761
Lighting Segment [Member] | Project Management, Installation Services, Shipping and Handling [Member]
Net Sales	711	791	1,478	1,660
Display Solutions Segment [Member]
Net Sales	44,210	61,971	100,010	121,507
Display Solutions Segment [Member] | LED Lighting, Digital Signage, Electronic Circuit Boards [Member]
Net Sales	8,791	5,801	17,724	12,976
Display Solutions Segment [Member] | Poles, Other Display Solution Elements [Member]
Net Sales	24,829	41,683	59,698	83,154
Display Solutions Segment [Member] | Project Management, Installation Services, Shipping and Handling [Member]
Net Sales	10,590	14,487	22,588	25,377
Transferred at Point in Time [Member] | Lighting Segment [Member]
Net Sales	54,619	58,591	112,271	116,668
Transferred at Point in Time [Member] | Display Solutions Segment [Member]
Net Sales	29,268	47,027	69,256	94,516
Transferred over Time [Member] | Lighting Segment [Member]
Net Sales	10,176	8,242	20,165	17,698
Transferred over Time [Member] | Display Solutions Segment [Member]
Net Sales	$ 14,942	$ 14,944	$ 30,754	$ 26,991