Note 2 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Revenue	$ 72,204	$ 71,010	$ 218,597	$ 242,088
Lighting Segment [Member]
Revenue	45,740	49,013	136,271	165,640
Lighting Segment [Member] | LED Lighting, Digital Signage, Electronic Circuit Boards [Member]
Revenue	40,298		118,681
Lighting Segment [Member] | Legacy Products [Member]
Revenue	5,071		16,299
Lighting Segment [Member] | Turnkey Services and Other [Member]
Revenue	371		1,291
Graphics Segment [Member]
Revenue	26,464	$ 21,997	82,326	$ 76,448
Graphics Segment [Member] | LED Lighting, Digital Signage, Electronic Circuit Boards [Member]
Revenue	8,595		20,546
Graphics Segment [Member] | Legacy Products [Member]
Revenue	11,809		41,526
Graphics Segment [Member] | Turnkey Services and Other [Member]
Revenue	6,060		20,254
Transferred at Point in Time [Member] | Lighting Segment [Member]
Revenue	39,497		119,478
Transferred at Point in Time [Member] | Graphics Segment [Member]
Revenue	12,550		42,991
Transferred over Time [Member] | Lighting Segment [Member]
Revenue	6,243		16,793
Transferred over Time [Member] | Graphics Segment [Member]
Revenue	$ 13,914		$ 39,335