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Foreclosed Assets - Real estate owned activity (Details) - USD ($)	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Foreclosed Assets
Beginning balance	$ 2,334,560	$ 0
Loans transferred to real estate owned	0	2,087,809
Capitalized expenditures	0	0
Direct write-downs	0	0
Sales of real estate owned	0	0
Ending balance	$ 2,334,560	$ 2,334,560

X

- Definition

The increase in the amount of real estate acquired through foreclosure, resulting from capitalized expenditures.

+ References

No definition available.

+ Details

Name:	mara_RealEstateAcquiredThroughForeclosureAdditionsThroughCapitalizedExpenditures
Namespace Prefix:	mara_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The increase in the amount of real estate acquired through foreclosure, resulting from loans transferred.

+ References

No definition available.

+ Details

Name:	mara_RealEstateAcquiredThroughForeclosureAdditionsThroughLoansTransferred
Namespace Prefix:	mara_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The decrease in the amount of real estate acquired through foreclosure, resulting from direct write downs.

+ References

No definition available.

+ Details

Name:	mara_RealEstateAcquiredThroughForeclosureReductionsThroughDirectWriteDowns
Namespace Prefix:	mara_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The decrease in the amount of real estate acquired through foreclosure, resulting from sales.

+ References

No definition available.

+ Details

Name:	mara_RealEstateAcquiredThroughForeclosureReductionsThroughSales
Namespace Prefix:	mara_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of real estate owned, gross

+ References

No definition available.

+ Details

Name:	mara_RealEstateOwnedGross
Namespace Prefix:	mara_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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