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Foreclosed Assets - Activity in the valuation allowance (Details) - USD ($) | 3 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Activity in the valuation allowance |  |
Beginning balance | $ 1,315,867 | $ 937,100
Provisions charged to expense | 0 | 0
Reductions from sales of real estate owned | 0 | 0
Direct write-downs | 0 | 0
Sales of real estate owned | 0 | 0
Ending balance | $ 1,315,867 | $ 937,100

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- 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

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- Definition Amount of expense (income) recognized in the income statement for a decrease/(increase) in valuation of real estate owned (REO). + References No definition available. + Details
Name: | mara_RealEstateOwnedValuationAllowanceProvisionRecoveries
Namespace Prefix: | mara_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of the valuation allowance for real estate owned that was applied in the period against the carrying amount of real estate owned that was written down or written off. + References No definition available. + Details
Name: | mara_RealEstateOwnedValuationAllowanceReductionFromDirectWriteDowns
Namespace Prefix: | mara_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of the valuation allowance for real estate owned that was applied in the period against the carrying amount of real estate owned that was sold. + References No definition available. + Details
Name: | mara_RealEstateOwnedValuationAllowanceReductionFromSales
Namespace Prefix: | mara_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition For each period for which an income statement is required, disclosure of the changes in the allowance, including balances at end of period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details
Name: | us-gaap_RealEstateOwnedValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_RealEstateOwnedValuationAllowanceRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration