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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 |

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- 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

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- 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

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- 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: |