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Note 3 - Income Taxes (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2022 | Sep. 30, 2021
Income Tax Expense (Benefit), Total | $ (26,925,000) | $ 40,150,000
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total | (102,549,000) | 153,050,000
Effective Income Tax Rate Reconciliation, Unrealized Gains (Losses) on Marketable Securities, Amount | 32,840,000 | 27,938,000
Effective Income Tax Rate Reconciliation, Benefit for the Dividends Received Deduction and Other Permanent Book and Tax Differences, Amount | 340,000 |
Effective Income Tax Rate Reconciliation, Realized Gains on Marketable Securities, Amount | 3,790,000 | $ 10,952,000
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount | 1,735,000 |
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount | $ 730,000 |
Effective Income Tax Rate Reconciliation, Percent, Total | 26.30% | 26.20%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 21.00%
Effective Income Tax Rate Reconciliation, Deduction, Dividends, Amount |  | $ 1,260,000
Domestic Tax Authority [Member] |  |
Open Tax Year | 2019 2020 2021 2022 |
State and Local Jurisdiction [Member] |  |
Open Tax Year | 2018 2019 2020 2021 2022 |
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member] |  |
Operating Loss Carryforwards, Total | $ 5,500,000 |

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to realized gains on marketable securities. + References No definition available. + Details
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