Note 16 - Financial Information by Business Segment - Total Revenues and Income by Business Segment (Details) - USD ($)	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Revenue from Contract with Customer, Including Assessed Tax	$ 15,074,000	$ 24,714,000
Investment Income, Net	316,000	(6,174,000)
Other income	242,000	235,000
Income before income taxes	4,083,000	4,968,000
Depreciation, Depletion and Amortization, Nonproduction	243,000	226,000
Gross identifiable assets	53,753,000	57,490,000
Deferred tax asset	1,920,000	872,000
Consolidated total assets	55,673,000	58,362,000
Income (Loss) from Equity Method Investments	0	(206,000)
Other Assets [Member]
Deferred tax asset	1,920,000	872,000
Investment Management Services [Member]
Revenue from Contract with Customer, Including Assessed Tax	15,074,000	24,714,000
Investment Income, Net	0	0
Other income	242,000	235,000
Income before income taxes	3,868,000	11,622,000
Depreciation, Depletion and Amortization, Nonproduction	243,000	226,000
Gross identifiable assets	25,918,000	23,003,000
Income (Loss) from Equity Method Investments		0
Corporate Investments [Member]
Revenue from Contract with Customer, Including Assessed Tax	0	0
Investment Income, Net	316,000	(6,174,000)
Other income	0	0
Income before income taxes	215,000	(6,654,000)
Depreciation, Depletion and Amortization, Nonproduction	0	0
Gross identifiable assets	$ 27,835,000	34,487,000
Income (Loss) from Equity Method Investments		$ (206,000)