Note 7 - Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($)	Sep. 30, 2023	Jun. 30, 2023
finite lived, gross	$ 86,235,000	$ 86,235,000
finite lived, accumulated amortization	36,324,000	35,134,000
finite lived, net	49,911,000	51,101,000
indefinite lived	12,102,000	12,102,000
Total Other Intangible Assets	98,337,000	98,337
Other intangible assets, net	62,013,000	63,203,000
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	18,671,000	17,817,000
finite lived, net	43,412,000	44,266,000
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		15,783,000
finite lived, net		5,183,000
Trade Names [Member]
finite lived, gross	2,658,000	2,658,000
finite lived, accumulated amortization	1,183,000	1,156,000
finite lived, net	1,475,000	1,502,000
Noncompete Agreements [Member]
finite lived, gross	260,000	260,000
finite lived, accumulated amortization	123,000	110,000
finite lived, net	137,000	$ 150,000
Technology-Based Intangible Assets [Member]
finite lived, gross	20,966,000
finite lived, accumulated amortization	16,079,000
finite lived, net	$ 4,887,000