Note 2 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Revenue	$ 72,832	$ 78,843	$ 247,330	$ 258,614
Lighting Segment [Member]
Revenue	52,785	61,554	177,871	199,156
Lighting Segment [Member] | Current Technology Products [Member]
Revenue	46,195		153,771
Lighting Segment [Member] | Legacy Products [Member]
Revenue	6,133		22,156
Lighting Segment [Member] | Turnkey Services and Other [Member]
Revenue	457		1,944
Graphics Segment [Member]
Revenue	20,047	$ 17,289	69,459	$ 59,458
Graphics Segment [Member] | Current Technology Products [Member]
Revenue	4,427		9,178
Graphics Segment [Member] | Legacy Products [Member]
Revenue	11,160		45,346
Graphics Segment [Member] | Turnkey Services and Other [Member]
Revenue	4,460		14,935
Transferred at Point in Time [Member] | Lighting Segment [Member]
Revenue	46,364		157,931
Transferred at Point in Time [Member] | Graphics Segment [Member]
Revenue	10,339		42,790
Transferred over Time [Member] | Lighting Segment [Member]
Revenue	6,421		19,940
Transferred over Time [Member] | Graphics Segment [Member]
Revenue	$ 9,708		$ 26,669