Note 2 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Revenue	$ 89,541	$ 92,305	$ 174,498	$ 179,771
Lighting Segment [Member]
Revenue	63,654	69,174	125,086	137,602
Lighting Segment [Member] | New Technology Products [Member]
Revenue	56,271		107,576
Lighting Segment [Member] | Legacy Products [Member]
Revenue	6,947		16,023
Lighting Segment [Member] | Turnkey Services and Other [Member]
Revenue	436		1,487
Graphics Segment [Member]
Revenue	25,887	$ 23,131	49,412	$ 42,169
Graphics Segment [Member] | New Technology Products [Member]
Revenue	2,349		4,751
Graphics Segment [Member] | Legacy Products [Member]
Revenue	18,222		34,186
Graphics Segment [Member] | Turnkey Services and Other [Member]
Revenue	5,316		10,475
Transferred at Point in Time [Member] | Lighting Segment [Member]
Revenue	57,318		111,567
Transferred at Point in Time [Member] | Graphics Segment [Member]
Revenue	14,758		32,452
Transferred over Time [Member] | Lighting Segment [Member]
Revenue	6,336		13,519
Transferred over Time [Member] | Graphics Segment [Member]
Revenue	$ 11,129		$ 16,960