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Note 9 - Income Taxes (Details Textual) - USD ($)
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Income Tax Expense (Benefit) $ 3,810,000 $ 8,480,000 $ 24,410,000 $ 16,810,000
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest $ 18,231,000 $ 31,835,000 94,396,000 68,195,000
Effective Income Tax Rate Reconciliation, Unrealized Gains (Losses) on Marketable Securities, Amount     21,990,000 12,480,000
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount     70,000 50,000
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount     2,530,000 1,440,000
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount     170,000 330,000
Effective Income Tax Rate Reconciliation, Deduction, Dividends, Amount     $ 350,000 $ 520,000
Effective Income Tax Rate Reconciliation, Percent     25.90% 24.65%
Effective Income Tax Rate Reconciliation, Realized Gains on Marketable Securities, Amount       $ 3,690,000