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Foreclosed Assets - Real estate owned activity (Details) - USD ($)	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Foreclosed Assets
Beginning balance	$ 2,312,240	$ 2,312,240
Loans transferred to real estate owned	0	0
Capitalized expenditures	0	0
Direct write-downs	0	0
Sales of real estate owned	0	0
Net gain on sale of foreclosed assets	0	0
Ending balance	$ 2,312,240	$ 2,312,240

X

- Definition

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

+ References

No definition available.

+ Details

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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

X

- Definition

The net gain (loss) resulting from sales and other disposals of other real estate owned, increases (decreases) in the valuation allowance for foreclosed real estate, and write-downs of other real estate owned after acquisition or physical possession.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(14)(d))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

+ Details

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