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Stock Issuances and Repurchases (Details) - ATM offering - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	May 12, 2017
Stock Issuances and Repurchases
Maximum value of common stock available for sale			$ 50,000
Number of stock issued (in shares)	0	0

X

- Definition

The maximum value of common stock available for sale.

+ References

No definition available.

+ Details

Name:	mrcc_MaximumValueOfCommonStockAvailableForSale
Namespace Prefix:	mrcc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsidiarySaleOfStockLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=mrcc_AtMarketMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: