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Note 3 - Income Taxes (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Income Tax Expense (Benefit), Total | $ 185,000 | $ (6,260,000)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest, Total | $ 4,226,000 | $ (31,476,000)
Effective Income Tax Rate Reconciliation, Percent, Total | 4.40% | 19.90%
Income Tax Expense (Benefit) From CARES Act |  | $ (187,000)
Marketable Securities, Unrealized Gain (Loss), Total | $ 3,099,000 |
Income Tax Expense (Benefit), Recorded as a Temporary Difference in Deferred Income Tax | (1,371,000) |
Marketable Securities, Realized Gain (Loss), Total | $ 4,193,000 | $ 0
Domestic Tax Authority [Member] |  |
Open Tax Year | 2016 2017 2018 2019 |
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |
Operating Loss Carryforwards, Total | $ 20,100,000 |
Domestic Tax Authority [Member] | California Franchise Tax Board [Member] |  |
Operating Loss Carryforwards, Total | 6,100,000 |
Domestic Tax Authority [Member] | Other State [Member] |  |
Operating Loss Carryforwards, Total | $ 2,600,000 |

X
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