Note 9 - Income Taxes (Details Textual) - USD ($)	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Tax Expense (Benefit)	$ 3,125,000	$ 6,100,000
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	15,740,000	23,927,000
Effective Income Tax Rate Reconciliation, Realized Gains on Marketable Securities, Amount	3,765,000	6,360,000
Effective Income Tax Rate Reconciliation, Unrealized Gains (Losses) on Marketable Securities, Amount	30,000	110,000
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	270,000	140,000
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	120,000	150,000
Effective Income Tax Rate Reconciliation, Deduction, Dividends, Amount	$ 820,000	$ 80,000
Effective Income Tax Rate Reconciliation, Percent	19.90%	25.49%
Domestic Tax Authority [Member]
Open Tax Year	2021
State and Local Jurisdiction [Member]
Open Tax Year	2020