Note 7 - Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Jun. 30, 2020
Amortized intangible assets, gross	$ 49,155	$ 54,625
Accumulated amortization	24,629	28,087
Amortized intangible assets, net	24,526	26,538
Indefinite-lived intangible assets, gross	3,422	3,422
Total other intangible assets, gross	52,577	58,047
Total other intangible assets, net	27,948	29,960
Trademarks and Trade Names [Member]
Indefinite-lived intangible assets, gross	3,422	3,422
Customer Relationships [Member]
Amortized intangible assets, gross	30,163	35,563
Accumulated amortization	10,273	14,129
Amortized intangible assets, net	19,890	21,434
Patents [Member]
Amortized intangible assets, gross	268	338
Accumulated amortization	230	277
Amortized intangible assets, net	38	61
Technology-Based Intangible Assets [Member]
Amortized intangible assets, gross	16,066
Accumulated amortization	13,215
Amortized intangible assets, net	2,851
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	911	829
Amortized intangible assets, net	$ 1,747	$ 1,829