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Note 11 - Debt and Commitments and Contingencies (Details Textual) (USD $) | 9 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Sep. 13, 2013 | Sep. 13, 2013 | Dec. 04, 2012
Commitments and Contingencies Disclosure [Abstract] |  |  |  |  |
Proceeds from Other Debt |  | $ 14,000,000 us-gaap_ProceedsFromOtherDebt |  |  |
Operating Leases, Rent Expense | 938,000 us-gaap_LeaseAndRentalExpense | 635,000 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_PropertySubjectToOrAvailableForOperatingLeaseAxis = 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_PropertySubjectToOrAvailableForOperatingLeaseAxis = djco_LoganUtahOfficeMember / us-gaap_StatementScenarioAxis = djco_MonthlyRentMember |  |  |  |
Rental Income, Nonoperating | 5,000 us-gaap_RentalIncomeNonoperating / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = djco_LoganUtahOfficeMember / us-gaap_StatementScenarioAxis = djco_MonthlyRentMember |  |  |  |
Margin Account [Member] | Fed Funds Rate [Member] |  |  |  |  |
Commitments and Contingencies Disclosure [Abstract] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = djco_MarginAccountMember / us-gaap_VariableRateAxis = djco_FedFundsRateMember |  |
ISD Corporation [Member] | Margin Account [Member] |  |  |  |  |
Commitments and Contingencies Disclosure [Abstract] |  |  |  |  |
Proceeds from Other Debt |  |  |  | 15,500,000 us-gaap_ProceedsFromOtherDebt / us-gaap_BusinessAcquisitionAxis = djco_ISDMember / us-gaap_DebtInstrumentAxis = djco_MarginAccountMember |
New Dawn [Member] | Margin Account [Member] |  |  |  |  |
Commitments and Contingencies Disclosure [Abstract] |  |  |  |  |
Proceeds from Other Debt |  |  |  |  | $ 14,000,000 us-gaap_ProceedsFromOtherDebt / us-gaap_BusinessAcquisitionAxis = djco_NewDawnMember / us-gaap_DebtInstrumentAxis = djco_MarginAccountMember

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- Definition The cash inflow from other borrowing not otherwise defined in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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