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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 |  |

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