Note 7 - Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($)	Mar. 31, 2023	Jun. 30, 2022
finite lived, gross	$ 86,235,000	$ 86,235,000
finite lived, accumulated amortization	33,943,000	30,373,000
finite lived, net	52,292,000	55,862,000
indefinite lived	12,102,000	12,102,000
Total Other Intangible Assets	98,337,000	98,337
Other intangible assets, net	64,394,000	67,964,000
Trademarks and Trade Names [Member]
indefinite lived	12,102,000	12,102,000
Customer Relationships [Member]
finite lived, gross	62,083,000	62,083,000
finite lived, accumulated amortization	16,962,000	14,400,000
finite lived, net	45,121,000	47,683,000
Patents [Member]
finite lived, gross	268,000	268,000
finite lived, accumulated amortization	268,000	268,000
finite lived, net	0	0
LED Technology Firmware Software [Member]
finite lived, gross		20,966,000
finite lived, accumulated amortization		14,598,000
finite lived, net		6,368,000
Trade Names [Member]
finite lived, gross	2,658,000	2,658,000
finite lived, accumulated amortization	1,129,000	1,049,000
finite lived, net	1,529,000	1,609,000
Noncompete Agreements [Member]
finite lived, gross	260,000	260,000
finite lived, accumulated amortization	98,000	58,000
finite lived, net	162,000	$ 202,000
Technology-Based Intangible Assets [Member]
finite lived, gross	20,966,000
finite lived, accumulated amortization	15,486,000
finite lived, net	$ 5,480,000