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Commitments and Contingent Liabilities (Details) - USD ($)	Jun. 30, 2024	Jun. 30, 2023
Other Commitments [Line Items]
Percentage outstanding with fixed interest rate	19.00%	100.00%
Percentage outstanding with variable interest rate	81.00%	0.00%
Commitments to grant loans
Other Commitments [Line Items]
Other commitments	$ 1,341,500	$ 407,904
Unused commitments under lines of credit
Other Commitments [Line Items]
Other commitments	3,691,619	4,718,652
MPF credit enhancements
Other Commitments [Line Items]
Other commitments	$ 658,008	$ 625,701

X

- Definition

Represents percentage of outstanding commitments to grant loans with fixed interest rates.

+ References

No definition available.

+ Details

Name:	mara_CommitmentsToGrantLoansPercentageOutstandingWithFixedInterestRate
Namespace Prefix:	mara_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents percentage of outstanding commitments to grant loans with variable interest rates.

+ References

No definition available.

+ Details

Name:	mara_CommitmentsToGrantLoansPercentageOutstandingWithVariableInterestRate
Namespace Prefix:	mara_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

+ References

No definition available.

+ Details

Name:	us-gaap_OtherCommitment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

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

X

- Details

Name:	us-gaap_OtherCommitmentsAxis=mara_CommitmentsToGrantLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_OtherCommitmentsAxis=mara_UnusedCommitmentsUnderLinesOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_OtherCommitmentsAxis=mara_MortgagePartnershipFinanceCreditEnhancementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: