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Note 6 - Treasury Stock and Net Income Per Common Share (Details Textual) - shares		1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 24, 2024	Jun. 30, 2022	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Sep. 30, 2022
Receipt of Donated Treasury Stock, Shares		3,720
Common Stock, Shares, Outstanding							1,377,026
Donated Shares, Granted	400
Weighted Average Number of Shares Outstanding, Basic			1,377,426	1,377,026	1,377,321	1,377,026

X

- Definition

The number of donated shares granted.

+ References

No definition available.

+ Details

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Namespace Prefix:	djco_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of shares of receipt of donated treasury stock.

+ References

No definition available.

+ Details

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Namespace Prefix:	djco_
Data Type:	xbrli:sharesItemType
Balance Type:	na
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X

- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-SubTopic 10
-Topic 505
-Publisher FASB
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
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-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
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-Name Accounting Standards Codification
-Section S99
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-3

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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-URI https://asc.fasb.org/1943274/2147479170/946-210-S99-1

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-3

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X

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 260
-SubTopic 10
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-Paragraph 1
-Subparagraph (a)
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-Publisher FASB
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Period Type:	duration