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Note 4 - Debt and Commitments (Details Textual) (USD $) | 12 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 acre | Sep. 13, 2013 | Sep. 13, 2013 | Dec. 04, 2012
Commitments and Contingencies Disclosure [Abstract] |  |  |  |  |  |  |
Proceeds from Other Debt |  | $ 29,493,000 us-gaap_ProceedsFromOtherDebt |  |  |  |  |
Operating Leases, Rent Expense | 1,182,000 us-gaap_LeaseAndRentalExpense | 884,000 us-gaap_LeaseAndRentalExpense | 455,000 us-gaap_LeaseAndRentalExpense |  |  |  |
Corona, CA Office [Member] | Monthly Rent [Member] |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Abstract] |  |  |  |  |  |  |
Operating Leases, Rent Expense |  |  |  | 12,000 us-gaap_LeaseAndRentalExpense / us-gaap_LeaseArrangementTypeAxis = djco_CoronaCAOfficeMember / us-gaap_StatementScenarioAxis = djco_MonthlyRentMember |  |  |
Area of Real Estate Property |  |  |  | 7,100 us-gaap_AreaOfRealEstateProperty / us-gaap_LeaseArrangementTypeAxis = djco_CoronaCAOfficeMember / us-gaap_StatementScenarioAxis = djco_MonthlyRentMember |  |  |
Logan, Utah Office [Member] | Monthly Rent [Member] |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Abstract] |  |  |  |  |  |  |
Operating Leases, Rent Expense |  |  |  | 42,000 us-gaap_LeaseAndRentalExpense / us-gaap_LeaseArrangementTypeAxis = djco_LoganUtahOfficeMember / us-gaap_StatementScenarioAxis = djco_MonthlyRentMember |  |  |
Area of Real Estate Property |  |  |  | 30,200 us-gaap_AreaOfRealEstateProperty / us-gaap_LeaseArrangementTypeAxis = djco_LoganUtahOfficeMember / us-gaap_StatementScenarioAxis = djco_MonthlyRentMember |  |  |
Rental Income, Nonoperating |  |  |  | 5,000 us-gaap_RentalIncomeNonoperating / us-gaap_LeaseArrangementTypeAxis = djco_LoganUtahOfficeMember / us-gaap_StatementScenarioAxis = djco_MonthlyRentMember |  |  |
San Francisco Office [Member] |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Abstract] |  |  |  |  |  |  |
Lessee Leasing Arrangements, Operating Leases, Renewal Term | 5 years |  |  |  |  |  |
Area of Real Estate Property | 6,200 us-gaap_AreaOfRealEstateProperty / us-gaap_LeaseArrangementTypeAxis = djco_SanFranciscoOfficeMember |  |  |  |  |  |
San Francisco Office [Member] | Monthly Rent [Member] |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Abstract] |  |  |  |  |  |  |
Operating Leases, Rent Expense | 22,000 us-gaap_LeaseAndRentalExpense / us-gaap_LeaseArrangementTypeAxis = djco_SanFranciscoOfficeMember / us-gaap_StatementScenarioAxis = djco_MonthlyRentMember |  |  |  |  |  |
Margin Account [Member] |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Abstract] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 0.75%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = djco_MarginAccountMember |  |  |  |  |  |
Margin Account [Member] | Fed Funds Rate [Member] |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Abstract] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 50.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = djco_MarginAccountMember / us-gaap_VariableRateAxis = djco_FedFundsRateMember |  |
ISD Corporation [Member] |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Abstract] |  |  |  |  |  |  |
Proceeds from Other Debt |  |  |  |  |  | 15,500,000 us-gaap_ProceedsFromOtherDebt / us-gaap_BusinessAcquisitionAxis = djco_ISDMember |
New Dawn [Member] |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Abstract] |  |  |  |  |  |  |
Proceeds from Other Debt |  |  |  |  |  |  | $ 14,000,000 us-gaap_ProceedsFromOtherDebt / us-gaap_BusinessAcquisitionAxis = djco_NewDawnMember

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