Note 2 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Revenue	$ 84,957	$ 87,466
Lighting Segment [Member]
Revenue	61,432	68,428
Lighting Segment [Member] | New Technology Products [Member]
Revenue	51,305
Lighting Segment [Member] | Legacy Products [Member]
Revenue	9,076
Lighting Segment [Member] | Turnkey Services and Other [Member]
Revenue	1,051
Graphics Segment [Member]
Revenue	23,525	$ 19,038
Graphics Segment [Member] | New Technology Products [Member]
Revenue	2,402
Graphics Segment [Member] | Legacy Products [Member]
Revenue	15,964
Graphics Segment [Member] | Turnkey Services and Other [Member]
Revenue	5,159
Transferred at Point in Time [Member] | Lighting Segment [Member]
Revenue	54,249
Transferred at Point in Time [Member] | Graphics Segment [Member]
Revenue	17,694
Transferred over Time [Member] | Lighting Segment [Member]
Revenue	7,183
Transferred over Time [Member] | Graphics Segment [Member]
Revenue	$ 5,831