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Foreclosed Assets - Real estate owned activity (Details) - USD ($) | 3 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024
Foreclosed Assets |  |
Beginning balance | $ 2,334,560 | $ 2,334,560
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 | $ 2,334,560 | $ 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

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