v3.25.3

Portfolio Securities (Details Narrative) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Equus Energy, LLC [Member]
Increase in fair value of investment	$ 2.0
Net change in unrealized appreciation	$ 7.0	$ 1.5
Net unrealized appreciation		0.9
PalletOne [Member]
Loss on sale receivable		$ 0.2

X

- References

No definition available.

+ Details

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Namespace Prefix:	equus_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	equus_InvestmentUnrealizedAppreciation
Namespace Prefix:	equus_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of increase (decrease) in the investments in and advances to affiliates.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 6
-Subparagraph (SX 210.12-14(Column A)(Footnote 1)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-6

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of cash inflow from the sale of receivables classified as other.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-12

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- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Period Type: