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Note 5 - Business Combinations (Details Textual) (USD $) | 3 Months Ended | 9 Months Ended | 7 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2013
Business Combinations [Abstract] |  |  |  |  |
Revenues | $ 11,147,000 us-gaap_Revenues | $ 9,204,000 us-gaap_Revenues | $ 31,926,000 us-gaap_Revenues | $ 26,650,000 us-gaap_Revenues |
Amortization of Intangible Assets | 1,223,000 us-gaap_AmortizationOfIntangibleAssets | 476,000 us-gaap_AmortizationOfIntangibleAssets | 3,642,000 us-gaap_AmortizationOfIntangibleAssets | 1,111,000 us-gaap_AmortizationOfIntangibleAssets |
Scenario, Previously Reported [Member] |  |  |  |  |
Business Combinations [Abstract] |  |  |  |  |
Revenues | 11,147,000 us-gaap_Revenues / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  | 31,926,000 us-gaap_Revenues / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |
ISD Corporation [Member] |  |  |  |  |
Business Combinations [Abstract] |  |  |  |  |
Revenues |  |  | 7,705,000 us-gaap_Revenues / us-gaap_BusinessAcquisitionAxis = djco_ISDMember |  |
Costs and Expenses |  |  | 5,960,000 us-gaap_CostsAndExpenses / us-gaap_BusinessAcquisitionAxis = djco_ISDMember |  |
Amortization of Intangible Assets |  |  | 2,217,000 us-gaap_AmortizationOfIntangibleAssets / us-gaap_BusinessAcquisitionAxis = djco_ISDMember |  |
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest |  |  | 1,778,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_BusinessAcquisitionAxis = djco_ISDMember |  |
New Dawn [Member] |  |  |  |  |
Business Combinations [Abstract] |  |  |  |  |
Revenues |  |  | 6,762,000 us-gaap_Revenues / us-gaap_BusinessAcquisitionAxis = djco_NewDawnMember |  | 6,430,000 us-gaap_Revenues / us-gaap_BusinessAcquisitionAxis = djco_NewDawnMember
Costs and Expenses |  |  | 9,857,000 us-gaap_CostsAndExpenses / us-gaap_BusinessAcquisitionAxis = djco_NewDawnMember |  | 7,168,000 us-gaap_CostsAndExpenses / us-gaap_BusinessAcquisitionAxis = djco_NewDawnMember
Amortization of Intangible Assets |  | 476,000 us-gaap_AmortizationOfIntangibleAssets / us-gaap_BusinessAcquisitionAxis = djco_NewDawnMember | 1,425,000 us-gaap_AmortizationOfIntangibleAssets / us-gaap_BusinessAcquisitionAxis = djco_NewDawnMember |  | 1,111,000 us-gaap_AmortizationOfIntangibleAssets / us-gaap_BusinessAcquisitionAxis = djco_NewDawnMember
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest |  |  | 3,569,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_BusinessAcquisitionAxis = djco_NewDawnMember |  | 718,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_BusinessAcquisitionAxis = djco_NewDawnMember
New Dawn [Member] | Scenario, Previously Reported [Member] |  |  |  |  |
Business Combinations [Abstract] |  |  |  |  |
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest |  |  | $ 3,051,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_BusinessAcquisitionAxis = djco_NewDawnMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |

X
- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Details
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- Definition Total costs of sales and operating expenses for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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Period Type: | duration

X
- Definition This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35710027&loc=d3e41242-110953 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Article 5 + Details
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X
- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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- Details
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- Details
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