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Foreclosed Assets - Expenses (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Foreclosed Assets |  |  |  |
Beginning balance | $ 0 | $ 0 | $ 0 |
Net loss (gain) on sales | 0 | 0 |  |
Provisions for unrealized losses | 0 | 0 | 378,767 | $ 937,100
Operating expenses, net of rental income | 16,235 | 17,572 |  |
Ending balance | $ 16,235 | $ 17,572 | $ 0 | $ 0

X
- Definition Amount of expenses related to foreclosed assets. + References No definition available. + Details
Name: | mara_ExpensesRelatedToForeclosedAssets
Namespace Prefix: | mara_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of operating expenses, net of rental income related to foreclosed assets. + References No definition available. + Details
Name: | mara_OperatingExpensesRelatedToForeclosedAssetsNetOfRentalIncome
Namespace Prefix: | mara_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Definition Amount of expense recognized in the income statement for a decrease in valuation of real estate owned (REO). + 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration