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Note 2 - Summary of Significant Accounting Policies (Details Textual) (USD $)
11 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended 10 Months Ended
Sep. 03, 2014
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Sep. 13, 2013
Sep. 30, 2013
Dec. 04, 2012
Sep. 30, 2013
Accounting Policies [Abstract]                
Finite-Lived Intangible Assets, Amortization Expense, Year Two   $ 4,895,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo            
Finite-Lived Intangible Assets, Amortization Expense, Year Three   4,895,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree            
Weighted Average Number of Shares Outstanding, Basic and Diluted 1,380,746us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 1,380,746us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 1,380,746us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 1,380,746us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted        
Goodwill   13,400,000us-gaap_Goodwill 13,400,000us-gaap_Goodwill     13,400,000us-gaap_Goodwill   13,400,000us-gaap_Goodwill
Liability for Uncertain Tax Positions, Current     0us-gaap_LiabilityForUncertainTaxPositionsCurrent 0us-gaap_LiabilityForUncertainTaxPositionsCurrent   0us-gaap_LiabilityForUncertainTaxPositionsCurrent   0us-gaap_LiabilityForUncertainTaxPositionsCurrent
Available-for-sale Securities   173,676,000us-gaap_AvailableForSaleSecurities 136,994,000us-gaap_AvailableForSaleSecurities     136,994,000us-gaap_AvailableForSaleSecurities   136,994,000us-gaap_AvailableForSaleSecurities
Available-for-sale Securities, Gross Unrealized Gain (Loss)   125,700,000us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1 89,018,000us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1          
Deferred Tax Liabilities, Investments   48,896,000us-gaap_DeferredTaxLiabilitiesInvestments 34,610,000us-gaap_DeferredTaxLiabilitiesInvestments 20,898,000us-gaap_DeferredTaxLiabilitiesInvestments   34,610,000us-gaap_DeferredTaxLiabilitiesInvestments   34,610,000us-gaap_DeferredTaxLiabilitiesInvestments
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net     1,719,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet 2,855,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet        
Amortization of Intangible Assets   4,866,000us-gaap_AmortizationOfIntangibleAssets 1,865,000us-gaap_AmortizationOfIntangibleAssets 0us-gaap_AmortizationOfIntangibleAssets        
Business Combination, Pro Forma Information, Disclosure Impracticable, Interest Expense     133,000djco_BusinessCombinationProFormaInformationDisclosureImpracticableInterestExpense 221,000djco_BusinessCombinationProFormaInformationDisclosureImpracticableInterestExpense        
Business Combination, Pro Forma Information Disclosure Impracticable Intangible Amortization     3,370,000djco_BusinessCombinationProFormaInformationDisclosureImpracticableIntangibleAmortization 5,235,000djco_BusinessCombinationProFormaInformationDisclosureImpracticableIntangibleAmortization        
Finite-Lived Intangible Assets, Net   17,744,000us-gaap_FiniteLivedIntangibleAssetsNet 22,610,000us-gaap_FiniteLivedIntangibleAssetsNet     22,610,000us-gaap_FiniteLivedIntangibleAssetsNet   22,610,000us-gaap_FiniteLivedIntangibleAssetsNet
Finite-Lived Intangible Assets, Accumulated Amortization   6,731,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization 1,865,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization     1,865,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization   1,865,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Finite-Lived Intangible Asset, Useful Life   5 years            
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months   4,895,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths            
Finite-Lived Intangible Assets, Amortization Expense, Year Four   3,058,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour            
Depreciation, Depletion and Amortization   650,000us-gaap_DepreciationDepletionAndAmortization 576,000us-gaap_DepreciationDepletionAndAmortization 503,000us-gaap_DepreciationDepletionAndAmortization        
Liability for Uncertain Tax Positions, Noncurrent   3,244,000us-gaap_LiabilityForUncertainTaxPositionsNoncurrent            
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   10 years            
Net of Taxes [Member]                
Accounting Policies [Abstract]                
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net     (1,051,000)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
/ us-gaap_StatementScenarioAxis
= djco_NetOfTaxesMember
         
Daily Journal Consolidated [Member]                
Accounting Policies [Abstract]                
Management Incentive Plan Total Amount Paid   0djco_ManagementIncentivePlanTotalAmountPaid
/ us-gaap_StatementBusinessSegmentsAxis
= djco_DailyJournalConsolidatedMember
241,240djco_ManagementIncentivePlanTotalAmountPaid
/ us-gaap_StatementBusinessSegmentsAxis
= djco_DailyJournalConsolidatedMember
701,520djco_ManagementIncentivePlanTotalAmountPaid
/ us-gaap_StatementBusinessSegmentsAxis
= djco_DailyJournalConsolidatedMember
       
Management Incentive Plan Total Percentage of Pre Tax Earnings   8.20%djco_ManagementIncentivePlanTotalPercentageOfPreTaxEarnings
/ us-gaap_StatementBusinessSegmentsAxis
= djco_DailyJournalConsolidatedMember
8.20%djco_ManagementIncentivePlanTotalPercentageOfPreTaxEarnings
/ us-gaap_StatementBusinessSegmentsAxis
= djco_DailyJournalConsolidatedMember
8.20%djco_ManagementIncentivePlanTotalPercentageOfPreTaxEarnings
/ us-gaap_StatementBusinessSegmentsAxis
= djco_DailyJournalConsolidatedMember
       
Daily Journal Non-Consolidated [Member]                
Accounting Policies [Abstract]                
Management Incentive Plan Total Amount Paid   265,490djco_ManagementIncentivePlanTotalAmountPaid
/ us-gaap_StatementBusinessSegmentsAxis
= djco_DailyJournalNonConsolidatedMember
351,120djco_ManagementIncentivePlanTotalAmountPaid
/ us-gaap_StatementBusinessSegmentsAxis
= djco_DailyJournalNonConsolidatedMember
513,500djco_ManagementIncentivePlanTotalAmountPaid
/ us-gaap_StatementBusinessSegmentsAxis
= djco_DailyJournalNonConsolidatedMember
       
Management Incentive Plan Total Percentage of Pre Tax Earnings   3.85%djco_ManagementIncentivePlanTotalPercentageOfPreTaxEarnings
/ us-gaap_StatementBusinessSegmentsAxis
= djco_DailyJournalNonConsolidatedMember
3.66%djco_ManagementIncentivePlanTotalPercentageOfPreTaxEarnings
/ us-gaap_StatementBusinessSegmentsAxis
= djco_DailyJournalNonConsolidatedMember
3.60%djco_ManagementIncentivePlanTotalPercentageOfPreTaxEarnings
/ us-gaap_StatementBusinessSegmentsAxis
= djco_DailyJournalNonConsolidatedMember
       
Sustain Technologies, Inc. [Member]                
Accounting Policies [Abstract]                
Management Incentive Plan Total Amount Paid   0djco_ManagementIncentivePlanTotalAmountPaid
/ us-gaap_StatementBusinessSegmentsAxis
= djco_SustainTechnologiesIncMember
0djco_ManagementIncentivePlanTotalAmountPaid
/ us-gaap_StatementBusinessSegmentsAxis
= djco_SustainTechnologiesIncMember
0djco_ManagementIncentivePlanTotalAmountPaid
/ us-gaap_StatementBusinessSegmentsAxis
= djco_SustainTechnologiesIncMember
       
Management Incentive Plan Total Percentage of Pre Tax Earnings   9.25%djco_ManagementIncentivePlanTotalPercentageOfPreTaxEarnings
/ us-gaap_StatementBusinessSegmentsAxis
= djco_SustainTechnologiesIncMember
7.95%djco_ManagementIncentivePlanTotalPercentageOfPreTaxEarnings
/ us-gaap_StatementBusinessSegmentsAxis
= djco_SustainTechnologiesIncMember
8.23%djco_ManagementIncentivePlanTotalPercentageOfPreTaxEarnings
/ us-gaap_StatementBusinessSegmentsAxis
= djco_SustainTechnologiesIncMember
       
Maximum [Member]                
Accounting Policies [Abstract]                
Property, Plant and Equipment, Useful Life   39 years            
Minimum [Member]                
Accounting Policies [Abstract]                
Property, Plant and Equipment, Useful Life   3 years            
Building and Building Improvements [Member] | Maximum [Member]                
Accounting Policies [Abstract]                
Property, Plant and Equipment, Useful Life   39 years            
Building and Building Improvements [Member] | Minimum [Member]                
Accounting Policies [Abstract]                
Property, Plant and Equipment, Useful Life   5 years            
Machinery and Equipment [Member] | Maximum [Member]                
Accounting Policies [Abstract]                
Property, Plant and Equipment, Useful Life   10 years            
Machinery and Equipment [Member] | Minimum [Member]                
Accounting Policies [Abstract]                
Property, Plant and Equipment, Useful Life   3 years            
Furniture, Office Equipment, and Software [Member] | Maximum [Member]                
Accounting Policies [Abstract]                
Property, Plant and Equipment, Useful Life   5 years            
Furniture, Office Equipment, and Software [Member] | Minimum [Member]                
Accounting Policies [Abstract]                
Property, Plant and Equipment, Useful Life   3 years            
Customer Relationships [Member]                
Accounting Policies [Abstract]                
Finite-Lived Intangible Assets, Net   15,946,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
20,310,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
    20,310,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
  20,310,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Finite-Lived Intangible Assets, Accumulated Amortization   6,004,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
1,640,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
    1,640,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
  1,640,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Developed Technology Rights [Member]                
Accounting Policies [Abstract]                
Finite-Lived Intangible Assets, Net   1,798,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
2,300,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
    2,300,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
  2,300,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
Finite-Lived Intangible Assets, Accumulated Amortization   727,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
225,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
    225,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
  225,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
Management Incentive Plan, Future Commitment [Member]                
Accounting Policies [Abstract]                
Other Accrued Liabilities   780,000us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent
/ us-gaap_FairValueByLiabilityClassAxis
= djco_ManagementIncentivePlanFutureCommitmentMember
1,620,000us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent
/ us-gaap_FairValueByLiabilityClassAxis
= djco_ManagementIncentivePlanFutureCommitmentMember
    1,620,000us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent
/ us-gaap_FairValueByLiabilityClassAxis
= djco_ManagementIncentivePlanFutureCommitmentMember
  1,620,000us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent
/ us-gaap_FairValueByLiabilityClassAxis
= djco_ManagementIncentivePlanFutureCommitmentMember
Increase (Decrease) in Other Accrued Liabilities   (840,000)us-gaap_IncreaseDecreaseInOtherAccruedLiabilities
/ us-gaap_FairValueByLiabilityClassAxis
= djco_ManagementIncentivePlanFutureCommitmentMember
2,580,000us-gaap_IncreaseDecreaseInOtherAccruedLiabilities
/ us-gaap_FairValueByLiabilityClassAxis
= djco_ManagementIncentivePlanFutureCommitmentMember
         
Other Accrued Liabilities Impact on Earnings Per Share   $ 0.61djco_OtherAccruedLiabilitiesImpactOnEarningsPerShare
/ us-gaap_FairValueByLiabilityClassAxis
= djco_ManagementIncentivePlanFutureCommitmentMember
$ 1.87djco_OtherAccruedLiabilitiesImpactOnEarningsPerShare
/ us-gaap_FairValueByLiabilityClassAxis
= djco_ManagementIncentivePlanFutureCommitmentMember
         
Sales Revenue, Net [Member] | Product Concentration Risk [Member]                
Accounting Policies [Abstract]                
Concentration Risk, Percentage   53.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
37.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
9.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
       
ISD Corporation [Member]                
Accounting Policies [Abstract]                
Goodwill             1,700,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= djco_ISDMember
 
Payments to Acquire Businesses, Gross         16,000,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= djco_ISDMember
     
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual     784,000us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= djco_ISDMember
    784,000us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= djco_ISDMember
   
Business Combination Pro Forma Information Expenses Since Acquisition Date Actual     694,000djco_BusinessCombinationProFormaInformationExpensesSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= djco_ISDMember
    694,000djco_BusinessCombinationProFormaInformationExpensesSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= djco_ISDMember
   
Amortization of Intangible Assets     278,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= djco_ISDMember
    278,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= djco_ISDMember
   
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual           90,000us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= djco_ISDMember
   
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Tangible Assets             4,410,000djco_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= djco_ISDMember
 
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents             2,546,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= djco_ISDMember
 
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables             1,636,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= djco_ISDMember
 
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment             141,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= djco_ISDMember
 
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets             87,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= djco_ISDMember
 
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles             14,975,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= djco_ISDMember
 
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities             5,112,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= djco_ISDMember
 
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other             2,270,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= djco_ISDMember
 
ISD Corporation [Member] | Deferred Maintenance Agreement [Member]                
Accounting Policies [Abstract]                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue             2,842,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue
/ us-gaap_BusinessAcquisitionAxis
= djco_ISDMember
/ us-gaap_FairValueByLiabilityClassAxis
= djco_DeferredMaintenanceAgreementMember
 
New Dawn [Member]                
Accounting Policies [Abstract]                
Payments to Acquire Businesses, Gross             14,000,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= djco_NewDawnMember
 
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual               10,403,000us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= djco_NewDawnMember
Business Combination Pro Forma Information Expenses Since Acquisition Date Actual               10,625,000djco_BusinessCombinationProFormaInformationExpensesSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= djco_NewDawnMember
Amortization of Intangible Assets               1,587,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= djco_NewDawnMember
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual               222,000us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= djco_NewDawnMember
Business Acquisition, Transaction Costs         202,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_BusinessAcquisitionAxis
= djco_NewDawnMember
  96,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_BusinessAcquisitionAxis
= djco_NewDawnMember
 
Liability for Uncertain Tax Positions, Noncurrent   $ 3,244,000us-gaap_LiabilityForUncertainTaxPositionsNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= djco_NewDawnMember