No definition available.

Name:	mrc_SubsidiarySaleOfStockAbstract
Namespace Prefix:	mrc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The total of the cash outflow during the period which has been paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt and the cost incurred directly for the issuance of equity securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3291-108585

+ Details

Name:	us-gaap_PaymentOfFinancingAndStockIssuanceCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfCommonStock
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Proceeds from issuance of capital stock which provides for a specific dividend that is paid to the shareholders before any dividends to common stockholders and which takes precedence over common stockholders in the event of liquidation.

+ References

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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

- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockPricePerShare
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

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

- Details

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

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_PreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

SHARE OFFERINGS AND FEES (Details) - USD ($)	1 Months Ended		9 Months Ended
SHARE OFFERINGS AND FEES (Details) - USD ($)	Sep. 30, 2022	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Sale of Stock [Abstract]
Proceeds from issuance of preferred stock			$ 11,449,495	$ 1,984,500
DRIP [Member]
Sale of Stock [Abstract]
Proceeds from shares issued			1,208,909	$ 839,610
Proceeds from issuance of preferred stock			39,988
Offering Circular [Member]
Sale of Stock [Abstract]
Proceeds from issuance of preferred stock			$ 11,449,495
Common Stock [Member]
Sale of Stock [Abstract]
Shares issued (in shares)	169.67	212.19
Price per share (in dollars per share)	$ 10.25	$ 10.25		$ 10.25
Common Stock [Member] \| DRIP [Member]
Sale of Stock [Abstract]
Shares issued (in shares)			131,046.97	91,013.94
Preferred Stock [Member]
Sale of Stock [Abstract]
Shares issued (in shares)				80,014.57
Proceeds from issuance of preferred stock				$ 1,984,500
Preferred shares offering cost			$ 1,363,238	$ 672,460
Preferred Stock [Member] \| DRIP [Member]
Sale of Stock [Abstract]
Shares issued (in shares)			735.66
Preferred Stock [Member] \| Offering Circular [Member]
Sale of Stock [Abstract]
Shares issued (in shares)			468,425.06