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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
 1 Months Ended 12 Months Ended
Jun. 30, 2022
Sep. 30, 2022
Sep. 30, 2021
Restricted Cash and Cash Equivalents, Total   $ 2,045,000 $ 2,043,000
Net Income (Loss) Attributable to Parent, Total   (75,624,000) 112,900,000
Unrealized Gain (Loss) on Investments   (123,401,000) 106,499,000
Equity Securities, FV-NI, Current   275,529,000 347,573,000
Equity Securities, FV-NI, Unrealized Gain (Loss), Total   120,692,000 244,093,000
Equity Securities, FV-NI, Unrealized Gain (Loss), Tax   32,120,000 64,115,000
Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale, Total   80,570,000 45,033,000
Debt Securities, Available-for-Sale, Realized Gain (Loss), Total   14,249,000 41,749,000
Payments to Acquire Marketable Securities   117,678,000 64,990,000
Proceeds from Issuance of Debt   43,014,000 17,000,000
Depreciation, Total   379,000 $ 480,000
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)     10 years
Increase (Decrease) in Other Accrued Liabilities   $ 1,245,000  
Other Accrued Liabilities Impact on Earnings Per Share (in dollars per share)   $ 90  
Common Stock, Shares, Outstanding, Ending Balance (in shares)   1,377,026  
Weighted Average Number of Shares Outstanding, Basic, Total (in shares)   1,379,655 1,380,746
Operating Lease, Right-of-Use Asset   $ 104,000 $ 215,000
Accrued Liabilities, Current and Noncurrent [Member]      
Operating Lease, Liability, Total   104,000  
Operating Lease, Liability, Noncurrent   $ 22,000 $ 103,000
Director [Member]      
Receipt of Donated Treasury Stock, Shares (in 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% 6.00%
Management Incentive Plan, Future Commitment [Member]      
Other Accrued Liabilities   $ 4,525,000 $ 3,280,000
Increase (Decrease) in Other Accrued Liabilities     $ 1,835,000
Other Accrued Liabilities Impact on Earnings Per Share (in dollars per share)     $ 1.33
Daily Journal Non-Consolidated [Member]      
Management Incentive Plan Total Percentage of Pre Tax Earnings   5.15% 4.96%
Management Incentive Plan Total Amount Paid   $ 474,300 $ 332,940
Journal Technologies [Member]      
Management Incentive Plan Total Percentage of Pre Tax Earnings   21.70% 12.33%
Management Incentive Plan Total Amount Paid   $ 455,700 $ 255,300
Daily Journal Consolidated [Member]      
Management Incentive Plan Total Percentage of Pre Tax Earnings   11.69% 12.24%
Management Incentive Plan Total Amount Paid   $ 1,295,540 $ 1,049,750
Product Concentration Risk [Member] | Revenue Benchmark [Member] | License and Service [Member]      
Concentration Risk, Percentage   71.00% 69.00%
Minimum [Member]      
Property, Plant and Equipment, Useful Life (Year)   3 years  
Minimum [Member] | Building and Building Improvements [Member]      
Property, Plant and Equipment, Useful Life (Year)   5 years  
Minimum [Member] | Furniture, Office Equipment, and Software [Member]      
Property, Plant and Equipment, Useful Life (Year)   3 years  
Minimum [Member] | Machinery and Equipment [Member]      
Property, Plant and Equipment, Useful Life (Year)   3 years  
Maximum [Member]      
Property, Plant and Equipment, Useful Life (Year)   39 years  
Maximum [Member] | Building and Building Improvements [Member]      
Property, Plant and Equipment, Useful Life (Year)   39 years  
Maximum [Member] | Furniture, Office Equipment, and Software [Member]      
Property, Plant and Equipment, Useful Life (Year)   5 years  
Maximum [Member] | Machinery and Equipment [Member]      
Property, Plant and Equipment, Useful Life (Year)   10 years