Note 7 - Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jun. 30, 2019
Amortized intangible assets, gross	$ 54,625	$ 54,625
Accumulated amortization	26,746	25,400
Amortized intangible assets, net	27,879	29,225
Indefinite-lived intangible assets, gross	3,422	3,422
Total other intangible assets, gross	58,047	58,047
Total other intangible assets, net	31,301	32,647
Trademarks and Trade Names [Member]
Indefinite-lived intangible assets, gross	3,422	3,422
Customer Relationships [Member]
Amortized intangible assets, gross	35,563	35,563
Accumulated amortization	13,100	12,070
Amortized intangible assets, net	22,463	23,493
Patents [Member]
Amortized intangible assets, gross	338	338
Accumulated amortization	262	247
Amortized intangible assets, net	76	91
Technology-Based Intangible Assets [Member]
Amortized intangible assets, gross	16,066
Accumulated amortization	12,610
Amortized intangible assets, net	3,456
LED Technology Firmware Software [Member]
Amortized intangible assets, gross		16,066
Accumulated amortization		12,364
Amortized intangible assets, net		$ 3,702
Trade Names [Member]
Amortized intangible assets, gross	2,658
Accumulated amortization	774
Amortized intangible assets, net	$ 1,884