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Note 8 - Revenue Recognition (Details Textual) (Sales Revenue, Net [Member], Customer Concentration Risk [Member], The Technology Companies [Member])
9 Months Ended
Jun. 30, 2014
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | The Technology Companies [Member]
 
Deferred Revenue Disclosure [Abstract]  
Concentration Risk, Percentage 52.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_StatementBusinessSegmentsAxis
= djco_TheTechnologyCompaniesMember