Note 8 - Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021
Amortized intangible assets, gross	$ 86,235	$ 86,235
Accumulated amortization	26,780	25,564
Amortized intangible assets, net	59,455	60,671
Indefinite-lived intangible assets, gross	12,102	12,102
Total other intangible assets, gross	98,337	98,337
Other intangible assets, net	71,557	72,773
Trademarks and Trade Names [Member]
Indefinite-lived intangible assets, gross	12,102	12,102
Customer Relationships [Member]
Amortized intangible assets, gross	62,083	62,083
Accumulated amortization	11,839	10,967
Amortized intangible assets, net	50,244	51,116
Patents [Member]
Amortized intangible assets, gross	268	268
Accumulated amortization	245	237
Amortized intangible assets, net	23	31
Technology-Based Intangible Assets [Member]
Amortized intangible assets, gross	20,966
Accumulated amortization	13,711
Amortized intangible assets, net	7,255
LED Technology Firmware Software [Member]
Amortized intangible assets, gross		20,966
Accumulated amortization		13,415
Amortized intangible assets, net		7,551
Trade Names [Member]
Amortized intangible assets, gross	2,658	2,658
Accumulated amortization	966	939
Amortized intangible assets, net	1,692	1,719
Noncompete Agreements [Member]
Amortized intangible assets, gross	260	260
Accumulated amortization	19	6
Amortized intangible assets, net	$ 241	$ 254