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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Accounting Policies [Abstract]
Return of capital distributions	$ 0	$ 0
Unamortized discounts and loan origination fees	3,767		$ 3,806
Upfront loan origination and closing fees received	412	$ 426
Fair value of the company's investments on non-accrual status	$ 10,768		$ 7,456

X

- Definition

Unamortized amount of discount and loan origination fees on debt investments, as of the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	mrcc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of cash inflow from upfront loan origination and closing fees on debt investments.

+ References

No definition available.

+ Details

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Namespace Prefix:	mrcc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

This item represents the aggregate fair value of loans held as assets that are in nonaccrual status for which the fair value option has been elected, if the entity's policy is to recognize interest income separately from other changes in fair value.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (e)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-28

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of distribution received from equity method investee for return of investment, classified as investing activities. Excludes distribution for return on investment, classified as operating activities.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 12
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-12

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 21D
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-21D

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