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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    $ 14,000,000us-gaap_ProceedsFromOtherDebt      
Operating Leases, Rent Expense 938,000us-gaap_LeaseAndRentalExpense 635,000us-gaap_LeaseAndRentalExpense      
Corona, CA Office [Member] | Monthly Rent [Member]          
Commitments and Contingencies Disclosure [Abstract]          
Operating Leases, Rent Expense 12,000us-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 42,000us-gaap_LeaseAndRentalExpense
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= djco_LoganUtahOfficeMember
/ us-gaap_StatementScenarioAxis
= djco_MonthlyRentMember
       
Rental Income, Nonoperating 5,000us-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       15,500,000us-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         $ 14,000,000us-gaap_ProceedsFromOtherDebt
/ us-gaap_BusinessAcquisitionAxis
= djco_NewDawnMember
/ us-gaap_DebtInstrumentAxis
= djco_MarginAccountMember