v3.22.2

CONDENSED STATEMENTS OF SHAREHOLDERS' EQUITY (UNAUDITED) (Parenthetical) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
CONDENSED STATEMENTS OF SHAREHOLDERS' EQUITY (UNAUDITED)
Net investment gain (loss), net of tax	$ 159,000	$ 662,691

X

- Definition

The difference between the carrying value and the sale price of equity securities, not separately or otherwise categorized as trading or available-for-sale. This element includes investments in which the entity holds a small ownership stake (generally, less than 20% of the shares outstanding) and cannot exert significant influence.

+ References

No definition available.

+ Details

Name:	mcvt_GainLossOnEquityInvestments
Namespace Prefix:	mcvt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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