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Note 10 - Summarized Financial Information for Reportable Segments (Details) (USD $)	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Revenues
Advertising	$ 2,704,000us-gaap_AdvertisingRevenue	$ 2,848,000us-gaap_AdvertisingRevenue
Circulation	1,524,000us-gaap_SubscriptionRevenue	1,540,000us-gaap_SubscriptionRevenue
Advertising service fees and other	685,000us-gaap_OtherSalesRevenueNet	676,000us-gaap_OtherSalesRevenueNet
Licensing and maintenance fees	3,757,000us-gaap_LicenseAndMaintenanceRevenue	3,008,000us-gaap_LicenseAndMaintenanceRevenue
Consulting fees	1,192,000djco_ConsultingRevenue	417,000djco_ConsultingRevenue
Other public service fees	1,461,000djco_OtherPublicServiceRevenue	1,462,000djco_OtherPublicServiceRevenue
Income (loss) from operations	(361,000)us-gaap_IncomeLossFromContinuingOperations	(1,269,000)us-gaap_IncomeLossFromContinuingOperations
Pretax income (loss)	408,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(650,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Benefit from income taxes	25,000us-gaap_IncomeTaxExpenseBenefit	10,000us-gaap_IncomeTaxExpenseBenefit
Net income (loss)	433,000us-gaap_NetIncomeLoss	(640,000)us-gaap_NetIncomeLoss
Total assets	234,826,000us-gaap_Assets	213,921,000us-gaap_Assets
Capital expenditures	69,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment	91,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Amortization of intangible assets	1,224,000us-gaap_AmortizationOfIntangibleAssets	1,195,000us-gaap_AmortizationOfIntangibleAssets
Journal Technologies [Member]
Revenues
Licensing and maintenance fees	3,757,000us-gaap_LicenseAndMaintenanceRevenue / us-gaap_StatementBusinessSegmentsAxis = djco_JournalTechnologiesMember	3,008,000us-gaap_LicenseAndMaintenanceRevenue / us-gaap_StatementBusinessSegmentsAxis = djco_JournalTechnologiesMember
Consulting fees	1,192,000djco_ConsultingRevenue / us-gaap_StatementBusinessSegmentsAxis = djco_JournalTechnologiesMember	417,000djco_ConsultingRevenue / us-gaap_StatementBusinessSegmentsAxis = djco_JournalTechnologiesMember
Other public service fees	1,461,000djco_OtherPublicServiceRevenue / us-gaap_StatementBusinessSegmentsAxis = djco_JournalTechnologiesMember	1,462,000djco_OtherPublicServiceRevenue / us-gaap_StatementBusinessSegmentsAxis = djco_JournalTechnologiesMember
Income (loss) from operations	(651,000)us-gaap_IncomeLossFromContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = djco_JournalTechnologiesMember	(1,963,000)us-gaap_IncomeLossFromContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = djco_JournalTechnologiesMember
Pretax income (loss)	(657,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = djco_JournalTechnologiesMember	(1,937,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = djco_JournalTechnologiesMember
Benefit from income taxes	250,000us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = djco_JournalTechnologiesMember	850,000us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = djco_JournalTechnologiesMember
Net income (loss)	(407,000)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = djco_JournalTechnologiesMember	(1,087,000)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = djco_JournalTechnologiesMember
Total assets	47,975,000us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = djco_JournalTechnologiesMember	46,779,000us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = djco_JournalTechnologiesMember
Capital expenditures	11,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = djco_JournalTechnologiesMember	66,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = djco_JournalTechnologiesMember
Amortization of intangible assets	1,224,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = djco_JournalTechnologiesMember	1,195,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = djco_JournalTechnologiesMember
Traditional Business [Member]
Revenues
Advertising		2,848,000us-gaap_AdvertisingRevenue / us-gaap_StatementBusinessSegmentsAxis = djco_TraditionalBusinessMember
Circulation	1,524,000us-gaap_SubscriptionRevenue / us-gaap_StatementBusinessSegmentsAxis = djco_TraditionalBusinessMember	1,540,000us-gaap_SubscriptionRevenue / us-gaap_StatementBusinessSegmentsAxis = djco_TraditionalBusinessMember
Advertising service fees and other		676,000us-gaap_OtherSalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = djco_TraditionalBusinessMember
Income (loss) from operations	290,000us-gaap_IncomeLossFromContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = djco_TraditionalBusinessMember	694,000us-gaap_IncomeLossFromContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = djco_TraditionalBusinessMember
Pretax income (loss)	1,065,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = djco_TraditionalBusinessMember	1,287,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = djco_TraditionalBusinessMember
Benefit from income taxes	(225,000)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = djco_TraditionalBusinessMember	(840,000)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = djco_TraditionalBusinessMember
Net income (loss)	840,000us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = djco_TraditionalBusinessMember	447,000us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = djco_TraditionalBusinessMember
Total assets	186,851,000us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = djco_TraditionalBusinessMember	167,142,000us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = djco_TraditionalBusinessMember
Capital expenditures	$ 58,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = djco_TraditionalBusinessMember	$ 25,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = djco_TraditionalBusinessMember

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