Note 15 - Restructuring Costs - Summary of Restructuring Costs by Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Restructuring and related costs, incurred cost	$ (7,591)	$ 1,806
Corporate, Non-Segment [Member]
Restructuring and related costs, incurred cost	23	49
Lighting Segment [Member] | Operating Segments [Member]
Restructuring and related costs, incurred cost	(4,674)	1,757
Graphics Segment [Member] | Operating Segments [Member]
Restructuring and related costs, incurred cost	$ (2,940)