Note 1 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Revenue	$ 328,852	$ 342,023
Lighting Segment [Member]
Revenue	235,114	260,613
Lighting Segment [Member] | New Technology Products [Member]
Revenue	203,049
Lighting Segment [Member] | Legacy Products [Member]
Revenue	29,592
Lighting Segment [Member] | Turnkey Services and Other [Member]
Revenue	2,473
Graphics Segment [Member]
Revenue	93,738	$ 81,410
Graphics Segment [Member] | New Technology Products [Member]
Revenue	12,479
Graphics Segment [Member] | Legacy Products [Member]
Revenue	59,867
Graphics Segment [Member] | Turnkey Services and Other [Member]
Revenue	21,392
Transferred at Point in Time [Member] | Lighting Segment [Member]
Revenue	207,577
Transferred at Point in Time [Member] | Graphics Segment [Member]
Revenue	54,866
Transferred over Time [Member] | Lighting Segment [Member]
Revenue	27,537
Transferred over Time [Member] | Graphics Segment [Member]
Revenue	$ 38,872