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Note 9 - Debt and Commitments and Contingencies (Details Textual) (USD $)
3 Months Ended 0 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 04, 2012
Sep. 13, 2013
Mar. 31, 2015
Operating Leases, Rent Expense $ 588,000us-gaap_LeaseAndRentalExpense $ 633,000us-gaap_LeaseAndRentalExpense      
New Dawn [Member] | Margin Account [Member]          
Proceeds from Other Debt     14,000,000us-gaap_ProceedsFromOtherDebt
/ us-gaap_BusinessAcquisitionAxis
= djco_NewDawnMember
/ us-gaap_DebtInstrumentAxis
= djco_MarginAccountMember
   
ISD Corporation [Member] | Margin Account [Member]          
Proceeds from Other Debt       $ 15,500,000us-gaap_ProceedsFromOtherDebt
/ us-gaap_BusinessAcquisitionAxis
= djco_ISDMember
/ us-gaap_DebtInstrumentAxis
= djco_MarginAccountMember
 
Margin Account [Member] | Fed Funds Rate [Member]          
Debt Instrument, Basis Spread on Variable Rate         0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= djco_MarginAccountMember
/ us-gaap_VariableRateAxis
= djco_FedFundsRateMember
Margin Account [Member]          
Debt Instrument, Interest Rate, Effective Percentage 0.75%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= djco_MarginAccountMember
      0.75%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= djco_MarginAccountMember