Note 1 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Revenue	$ 315,612	$ 305,558
Lighting Segment [Member]
Revenue	189,000	206,199
Lighting Segment [Member] | LED Lighting, Digital Signage, Electronic Circuit Boards [Member]
Revenue	164,778
Lighting Segment [Member] | Legacy Products [Member]
Revenue	22,492
Lighting Segment [Member] | Turnkey Services and Other [Member]
Revenue	1,730
Display Solutions Segment [Member]
Revenue	126,612	$ 99,359
Display Solutions Segment [Member] | LED Lighting, Digital Signage, Electronic Circuit Boards [Member]
Revenue	35,976
Display Solutions Segment [Member] | Legacy Products [Member]
Revenue	61,919
Display Solutions Segment [Member] | Turnkey Services and Other [Member]
Revenue	28,717
Transferred at Point in Time [Member] | Lighting Segment [Member]
Revenue	165,062
Transferred at Point in Time [Member] | Display Solutions Segment [Member]
Revenue	66,123
Transferred over Time [Member] | Lighting Segment [Member]
Revenue	23,938
Transferred over Time [Member] | Display Solutions Segment [Member]
Revenue	$ 60,489