Note 2 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Revenue	$ 88,701	$ 84,957
Lighting Segment [Member]
Revenue	63,191	61,432
Lighting Segment [Member] | LED Lighting, Digital Signage, Electronic Circuit Boards [Member]
Revenue	54,483
Lighting Segment [Member] | Legacy Products [Member]
Revenue	8,038
Lighting Segment [Member] | Turnkey Services and Other [Member]
Revenue	670
Graphics Segment [Member]
Revenue	25,510	$ 23,525
Graphics Segment [Member] | LED Lighting, Digital Signage, Electronic Circuit Boards [Member]
Revenue	3,874
Graphics Segment [Member] | Legacy Products [Member]
Revenue	16,700
Graphics Segment [Member] | Turnkey Services and Other [Member]
Revenue	4,936
Transferred at Point in Time [Member] | Lighting Segment [Member]
Revenue	56,525
Transferred at Point in Time [Member] | Graphics Segment [Member]
Revenue	17,725
Transferred over Time [Member] | Lighting Segment [Member]
Revenue	6,666
Transferred over Time [Member] | Graphics Segment [Member]
Revenue	$ 7,785