Note 7 - Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020
Amortized intangible assets, gross	$ 54,625	$ 54,625
Accumulated amortization	28,758	28,087
Amortized intangible assets, net	25,867	26,538
Indefinite-lived intangible assets, gross	3,422	3,422
Total other intangible assets, gross	58,047	58,047
Total other intangible assets, net	29,289	29,960
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	14,644	14,129
Amortized intangible assets, net	20,919	21,434
Patents [Member]
Amortized intangible assets, gross	338	338
Accumulated amortization	285	277
Amortized intangible assets, net	53	61
Technology-Based Intangible Assets [Member]
Amortized intangible assets, gross	16,066
Accumulated amortization	12,973
Amortized intangible assets, net	3,093
LED Technology Firmware Software [Member]
Amortized intangible assets, gross		16,066
Accumulated amortization		12,852
Amortized intangible assets, net		3,214
Trade Names [Member]
Amortized intangible assets, gross	2,658	2,658
Accumulated amortization	856	829
Amortized intangible assets, net	$ 1,802	$ 1,829