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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
 1 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Jun. 30, 2022
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Restricted Cash and Cash Equivalents       $ 2,191,000 $ 2,100,000 $ 2,045,000
Net income       78,113,000 21,452,000 (21,452,000)
Unrealized Gain (Loss) on Investments       96,142,000   (17,446,000)
Net Income (Loss) Attributable to Parent       (78,113,000) (21,452,000) 21,452,000
Unrealized Gain (Loss) on Investments       (96,142,000)   17,446,000
Equity Securities, FV-NI, Current       358,691,000 303,128,000  
Equity Securities, FV-NI, Unrealized Gain (Loss)       219,597,000   137,716,000
Equity Securities, FV-NI, Unrealized Gain (Loss), Tax       57,100,000   $ 36,260,000
Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale $ 40,579,000     40,579,000 2,826,000  
Debt Securities, Available-for-Sale, Realized Gain (Loss) $ 14,261,000       422,000  
Debt Instrument, Face Amount       27,500,000 75,000,000  
Proceeds from (Repayments of) Notes Payable       47,500,000    
Payments to Acquire Marketable Securities         10,001,000  
Proceeds from Issuance of Debt         6,011,000  
Repayments of Debt         6,011,000  
Investment Margin Account       27,500,000 75,000,000  
Dividend Income, Operating, Paid in Kind   $ 2,978,000        
Depreciation       $ 267,000 279,000  
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period       10 years   10 years
Common Stock, Shares, Outstanding           1,377,026
Operating Lease, Liability       $ 126,000 95,000  
Operating Lease, Liability, Noncurrent       37,000 44,000  
Operating Lease, Right-of-Use Asset       $ 126,000 $ 95,000  
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]       Accrued liabilities Accrued liabilities  
Accrued Vacation, Current       $ 3,425,000 $ 3,160,000  
Supplemental Compensation Accrual, Current       2,248,000 3,240,000  
Accrued Salaries, Current       1,354,000 1,274,000  
Accrued Supplemental Compensation, Noncurrent       $ 3,735,000 4,230,000  
Director [Member]            
Receipt of Donated Treasury Stock, Shares     3,720      
Receipt of Donated Treasury Stock, Value     $ 1,000,000      
Measurement Input, Discount Rate [Member]            
Incentive Plan Future Commitment, Measurement Input       6.00%    
Management Incentive Plan, Future Commitment [Member]            
Other Accrued Liabilities       $ 3,735,000 4,230,000  
Increase (Decrease) in Other Accrued Liabilities       $ 495,000 $ (295,000)  
Other Accrued Liabilities Impact on Earnings Per Share       $ 0.36 $ 0.21  
Increase (Decrease) in Other Accrued Liabilities       $ (495,000) $ 295,000  
Other Accrued Liabilities Impact on Earnings Per Share       $ (0.36) $ (0.21)  
Daily Journal Non-Consolidated [Member]            
Management Incentive Plan Total Percentage of Pre Tax Earnings       4.38% 4.71%  
Management Incentive Plan Total Amount Paid       $ 418,700 $ 388,450  
Journal Technologies [Member]            
Management Incentive Plan Total Percentage of Pre Tax Earnings       20.20% 22.20%  
Management Incentive Plan Total Amount Paid       $ 702,960 $ 1,491,840  
Daily Journal Consolidated [Member]            
Management Incentive Plan Total Percentage of Pre Tax Earnings       8.12% 8.86%  
Management Incentive Plan Total Amount Paid       $ 1,059,195 $ 1,260,800  
Restricted Stock Units (RSUs) [Member]            
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount       $ 169,000    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)       1 year 9 months 25 days    
Equity Incentive Plan [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)       3,320    
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)       3,720    
Product Concentration Risk [Member] | Revenue Benchmark [Member] | License [Member]            
Concentration Risk, Percentage       76.00% 76.00%  
Minimum [Member]            
Property, Plant and Equipment, Useful Life       3 years    
Minimum [Member] | Machinery and Equipment [Member]            
Property, Plant and Equipment, Useful Life       3 years    
Minimum [Member] | Building and Building Improvements [Member]            
Property, Plant and Equipment, Useful Life       5 years    
Minimum [Member] | Furniture, Office Equipment, and Software [Member]            
Property, Plant and Equipment, Useful Life       3 years    
Maximum [Member]            
Property, Plant and Equipment, Useful Life       39 years    
Maximum [Member] | Machinery and Equipment [Member]            
Property, Plant and Equipment, Useful Life       10 years    
Maximum [Member] | Building and Building Improvements [Member]            
Property, Plant and Equipment, Useful Life       39 years    
Maximum [Member] | Furniture, Office Equipment, and Software [Member]            
Property, Plant and Equipment, Useful Life       5 years