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Note 3 - Income Taxes (Details Textual) - USD ($)
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Income Tax Expense (Benefit), Total $ 40,150,000 $ 185,000
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total $ 153,050,000 $ 4,226,000
Effective Income Tax Rate Reconciliation, Percent, Total 26.20% 4.40%
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  
Effective Income Tax Rate Reconciliation, Unrealized Gains on Marketable Securities, Amount 27,938,000  
Effective Income Tax Rate Reconciliation, Realized Gains on Marketable Securities, Amount 10,952,000  
Income Tax Expense (Benefit) From CARES Act   $ (187,000)
Marketable Securities, Unrealized Gain (Loss), Total 106,499,000 (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 $ 41,749,000 $ 4,193,000
Domestic Tax Authority [Member]    
Open Tax Year 2018  
State and Local Jurisdiction [Member]    
Open Tax Year 2017  
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member]    
Operating Loss Carryforwards, Total $ 5,500,000