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Note 3 - Income Taxes - Operating Loss Carryforwards (Details) - State and Local Jurisdiction [Member] $ in Millions	Sep. 30, 2021 USD ($)
Other State [Member]
Operating Loss Carryforward	$ 2.4
Operating Loss Carryforward, No Expiration	1.9
Other State [Member] | Expires at Fiscal Year Ended September 30, 2023 [Member]
Operating Loss Carryforward	0.1
Other State [Member] | Expires at Fiscal Year Ended September 30, 2037 [Member]
Operating Loss Carryforward	0.1
Other State [Member] | Expires at Fiscal Year Ended September 30, 2038 [Member]
Operating Loss Carryforward	0.2
Other State [Member] | Expires at Fiscal Year Ended September 30, 2039 [Member]
Operating Loss Carryforward	0.1
California Franchise Tax Board [Member]
Operating Loss Carryforward	5.5
California Franchise Tax Board [Member] | Expires at Fiscal Year Ended September 30, 2038 [Member]
Operating Loss Carryforward	4.8
California Franchise Tax Board [Member] | Expires at Fiscal Year Ended September 30, 2039 [Member]
Operating Loss Carryforward	$ 0.7

X

- Definition

Operating loss carryforwards that are not subject to expiration dates.

+ References

No definition available.

+ Details

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Namespace Prefix:	djco_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32559-109319

+ Details

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Period Type:	instant

X

- Details

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X

- Details

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X

- Details

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- Details

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- Details

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X

- Details

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X

- Details

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