<?xml version="1.0" encoding="utf-8"?>
<FilingSummary xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <Version>2.4.1.9</Version>
  <ProcessingTime />
  <ReportFormat>Html</ReportFormat>
  <ContextCount>177</ContextCount>
  <ElementCount>294</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>85</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>4</UnitCount>
  <MyReports>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>000 - Disclosure - Document And Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/DocumentAndEntityInformation</Role>
      <ShortName>Document And Entity Information</ShortName>
    </Report>
    <Report>
      <IsDefault>true</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>001 - Statement - Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/ConsolidatedBalanceSheet</Role>
      <ShortName>Consolidated Balance Sheets</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>002 - Statement - Consolidated Balance Sheets (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/ConsolidatedBalanceSheet_Parentheticals</Role>
      <ShortName>Consolidated Balance Sheets (Parentheticals)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>003 - Statement - Consolidated Statements of Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/ConsolidatedIncomeStatement</Role>
      <ShortName>Consolidated Statements of Operations</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>004 - Statement - Statements of Stockholders' Deficit</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/ShareholdersEquityType2or3</Role>
      <ShortName>Statements of Stockholders' Deficit</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>005 - Statement - Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/ConsolidatedCashFlow</Role>
      <ShortName>Consolidated Statements of Cash Flows</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>006 - Disclosure - Non-Cash Investing and Financing Transactions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/NonCashInvestingandFinancingTransactions</Role>
      <ShortName>Non-Cash Investing and Financing Transactions</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>007 - Disclosure - Note 1 - Description of the Business and Liquidity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/Note1DescriptionoftheBusinessandLiquidity</Role>
      <ShortName>Note 1 - Description of the Business and Liquidity</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>008 - Disclosure - Note 2 - Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/Note2SummaryofSignificantAccountingPolicies</Role>
      <ShortName>Note 2 - Summary of Significant Accounting Policies</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>009 - Disclosure - Note 3 - Inventory</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/Note3Inventory</Role>
      <ShortName>Note 3 - Inventory</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>010 - Disclosure - Note 4 - Property and Equipment</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/Note4PropertyandEquipment</Role>
      <ShortName>Note 4 - Property and Equipment</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>011 - Disclosure - Note 5 - Sale of Intellectual Property in Exchange for Cancellation of the Boston Scientific Notes</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://mriinterventions.com/role/Note5SaleofIntellectualPropertyinExchangeforCancellationoftheBostonScientificNotes</Role>
      <ShortName>Note 5 - Sale of Intellectual Property in Exchange for Cancellation of the Boston Scientific Notes</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>012 - Disclosure - Note 6 - Notes Payable</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://mriinterventions.com/role/Note6NotesPayable</Role>
      <ShortName>Note 6 - Notes Payable</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>013 - Disclosure - Note 7 - Stockholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/Note7StockholdersEquity</Role>
      <ShortName>Note 7 - Stockholders' Equity</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>014 - Disclosure - Note 8 - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/Note8IncomeTaxes</Role>
      <ShortName>Note 8 - Income Taxes</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>015 - Disclosure - Note 9 - Commitments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/Note9Commitments</Role>
      <ShortName>Note 9 - Commitments</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>016 - Disclosure - Note 10 - Legal Proceeding</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/Note10LegalProceeding</Role>
      <ShortName>Note 10 - Legal Proceeding</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>017 - Disclosure - Note 11 - Subsequent Events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/Note11SubsequentEvents</Role>
      <ShortName>Note 11 - Subsequent Events</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>018 - Disclosure - Accounting Policies, by Policy (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/AccountingPoliciesByPolicy</Role>
      <ShortName>Accounting Policies, by Policy (Policies)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>019 - Disclosure - Note 2 - Summary of Significant Accounting Policies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/Note2SummaryofSignificantAccountingPoliciesTables</Role>
      <ShortName>Note 2 - Summary of Significant Accounting Policies (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>020 - Disclosure - Note 3 - Inventory (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/Note3InventoryTables</Role>
      <ShortName>Note 3 - Inventory (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>021 - Disclosure - Note 4 - Property and Equipment (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/Note4PropertyandEquipmentTables</Role>
      <ShortName>Note 4 - Property and Equipment (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>022 - Disclosure - Note 6 - Notes Payable (Tables)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://mriinterventions.com/role/Note6NotesPayableTables</Role>
      <ShortName>Note 6 - Notes Payable (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>023 - Disclosure - Note 7 - Stockholders' Equity (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/Note7StockholdersEquityTables</Role>
      <ShortName>Note 7 - Stockholders' Equity (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>024 - Disclosure - Note 8 - Income Taxes (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/Note8IncomeTaxesTables</Role>
      <ShortName>Note 8 - Income Taxes (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>025 - Disclosure - Note 9 - Commitments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/Note9CommitmentsTables</Role>
      <ShortName>Note 9 - Commitments (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>026 - Disclosure - Non-Cash Investing and Financing Transactions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/NonCashInvestingandFinancingTransactionsDetails</Role>
      <ShortName>Non-Cash Investing and Financing Transactions (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>027 - Disclosure - Note 1 - Description of the Business and Liquidity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/Note1DescriptionoftheBusinessandLiquidityDetails</Role>
      <ShortName>Note 1 - Description of the Business and Liquidity (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>028 - Disclosure - Note 2 - Summary of Significant Accounting Policies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/Note2SummaryofSignificantAccountingPoliciesDetails</Role>
      <ShortName>Note 2 - Summary of Significant Accounting Policies (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>029 - Disclosure - Note 2 - Summary of Significant Accounting Policies (Details) - Financial Assets and Liabilities at Fair Value on a Recurring Basis</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/FinancialAssetsandLiabilitiesatFairValueonaRecurringBasisTable</Role>
      <ShortName>Note 2 - Summary of Significant Accounting Policies (Details) - Financial Assets and Liabilities at Fair Value on a Recurring Basis</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>030 - Disclosure - Note 2 - Summary of Significant Accounting Policies (Details) - Carrying Values and Estimated Fair Values of Outstanding Notes</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://mriinterventions.com/role/CarryingValuesandEstimatedFairValuesofOutstandingNotesTable</Role>
      <ShortName>Note 2 - Summary of Significant Accounting Policies (Details) - Carrying Values and Estimated Fair Values of Outstanding Notes</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>031 - Disclosure - Note 2 - Summary of Significant Accounting Policies (Details) - Anti-dilutive Securities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/AntidilutiveSecuritiesTable</Role>
      <ShortName>Note 2 - Summary of Significant Accounting Policies (Details) - Anti-dilutive Securities</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>032 - Disclosure - Note 3 - Inventory (Details) - Inventory</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/InventoryTable</Role>
      <ShortName>Note 3 - Inventory (Details) - Inventory</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>033 - Disclosure - Note 4 - Property and Equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/Note4PropertyandEquipmentDetails</Role>
      <ShortName>Note 4 - Property and Equipment (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>034 - Disclosure - Note 4 - Property and Equipment (Details) - Property and equipment</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/PropertyandequipmentTable</Role>
      <ShortName>Note 4 - Property and Equipment (Details) - Property and equipment</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>035 - Disclosure - Note 5 - Sale of Intellectual Property in Exchange for Cancellation of the Boston Scientific Notes (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://mriinterventions.com/role/Note5SaleofIntellectualPropertyinExchangeforCancellationoftheBostonScientificNotesDetails</Role>
      <ShortName>Note 5 - Sale of Intellectual Property in Exchange for Cancellation of the Boston Scientific Notes (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>036 - Disclosure - Note 6 - Notes Payable (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://mriinterventions.com/role/Note6NotesPayableDetails</Role>
      <ShortName>Note 6 - Notes Payable (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>037 - Disclosure - Note 6 - Notes Payable (Details) - Assumptions Used in Calculating Fair Value of Warrants Issued, Directors</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://mriinterventions.com/role/AssumptionsUsedinCalculatingFairValueofWarrantsIssuedDirectorsTable</Role>
      <ShortName>Note 6 - Notes Payable (Details) - Assumptions Used in Calculating Fair Value of Warrants Issued, Directors</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>038 - Disclosure - Note 6 - Notes Payable (Details) - Principal Payments - Notes Payable</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://mriinterventions.com/role/PrincipalPaymentsNotesPayableTable</Role>
      <ShortName>Note 6 - Notes Payable (Details) - Principal Payments - Notes Payable</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>039 - Disclosure - Note 7 - Stockholders' Equity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/Note7StockholdersEquityDetails</Role>
      <ShortName>Note 7 - Stockholders' Equity (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>040 - Disclosure - Note 7 - Stockholders' Equity (Details) - Assumptions Used in Calculating Fair Value of Warrants Issued, Private Placement</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/AssumptionsUsedinCalculatingFairValueofWarrantsIssuedPrivatePlacementTable</Role>
      <ShortName>Note 7 - Stockholders' Equity (Details) - Assumptions Used in Calculating Fair Value of Warrants Issued, Private Placement</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>041 - Disclosure - Note 7 - Stockholders' Equity (Details) - Changes in Fair Values of Warrants Issued</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/ChangesinFairValuesofWarrantsIssuedTable</Role>
      <ShortName>Note 7 - Stockholders' Equity (Details) - Changes in Fair Values of Warrants Issued</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>042 - Disclosure - Note 7 - Stockholders' Equity (Details) - Stock Options</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/StockOptionsTable</Role>
      <ShortName>Note 7 - Stockholders' Equity (Details) - Stock Options</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>043 - Disclosure - Note 7 - Stockholders' Equity (Details) - Summary of Stock Options</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/SummaryofStockOptionsTable</Role>
      <ShortName>Note 7 - Stockholders' Equity (Details) - Summary of Stock Options</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>044 - Disclosure - Note 7 - Stockholders' Equity (Details) - Nonvested Stock Options</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/NonvestedStockOptionsTable</Role>
      <ShortName>Note 7 - Stockholders' Equity (Details) - Nonvested Stock Options</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>045 - Disclosure - Note 7 - Stockholders' Equity (Details) - Stock Options Valuation Assumptions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/StockOptionsValuationAssumptionsTable</Role>
      <ShortName>Note 7 - Stockholders' Equity (Details) - Stock Options Valuation Assumptions</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>046 - Disclosure - Note 7 - Stockholders' Equity (Details) - Common Stock Warrants</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/CommonStockWarrantsTable</Role>
      <ShortName>Note 7 - Stockholders' Equity (Details) - Common Stock Warrants</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>047 - Disclosure - Note 7 - Stockholders' Equity (Details) - Outstanding Warrants</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/OutstandingWarrantsTable</Role>
      <ShortName>Note 7 - Stockholders' Equity (Details) - Outstanding Warrants</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>048 - Disclosure - Note 8 - Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/Note8IncomeTaxesDetails</Role>
      <ShortName>Note 8 - Income Taxes (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>049 - Disclosure - Note 8 - Income Taxes (Details) - Deferred Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/DeferredIncomeTaxesTable</Role>
      <ShortName>Note 8 - Income Taxes (Details) - Deferred Income Taxes</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>050 - Disclosure - Note 9 - Commitments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/Note9CommitmentsDetails</Role>
      <ShortName>Note 9 - Commitments (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>051 - Disclosure - Note 9 - Commitments (Details) - Minimum Royalty Payments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/MinimumRoyaltyPaymentsTable</Role>
      <ShortName>Note 9 - Commitments (Details) - Minimum Royalty Payments</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>052 - Disclosure - Note 10 - Legal Proceeding (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/Note10LegalProceedingDetails</Role>
      <ShortName>Note 10 - Legal Proceeding (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>053 - Disclosure - Note 11 - Subsequent Events (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://mriinterventions.com/role/Note11SubsequentEventsDetails</Role>
      <ShortName>Note 11 - Subsequent Events (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <Logs>
    <Log type="Info">Element mric_WarrantsIssuedDuringPeriodWeightedAverageExercisePrice had a mix of decimals attribute values: 2 3.</Log>
    <Log type="Info">Element us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 had a mix of decimals attribute values: 2 4.</Log>
    <Log type="Info">Element us-gaap_ConcentrationRiskPercentage1 had a mix of decimals attribute values: 2 3.</Log>
    <Log type="Info">Element us-gaap_DebtInstrumentInterestRateStatedPercentage had a mix of decimals attribute values: 2 3.</Log>
    <Log type="Info">Columns in Cash Flows statement 'Consolidated Statements of Cash Flows (USD $)' have maximum duration 364 days and at least 31 values. Shorter duration columns must have at least one fourth (7) as many values. Column '1/1/2013 - 1/31/2013' is shorter (30 days) and has only 2 values, so it is being removed.</Log>
    <Log type="Info">Columns in Cash Flows statement 'Consolidated Statements of Cash Flows (USD $)' have maximum duration 364 days and at least 31 values. Shorter duration columns must have at least one fourth (7) as many values. Column '3/1/2014 - 3/31/2014' is shorter (30 days) and has only 1 values, so it is being removed.</Log>
    <Log type="Info">Columns in Cash Flows statement 'Consolidated Statements of Cash Flows (USD $)' have maximum duration 364 days and at least 31 values. Shorter duration columns must have at least one fourth (7) as many values. Column '12/1/2014 - 12/31/2014' is shorter (30 days) and has only 2 values, so it is being removed.</Log>
    <Log type="Info">Process Flow-Through: 001 - Statement - Consolidated Balance Sheets</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2012'</Log>
    <Log type="Info">Process Flow-Through: 002 - Statement - Consolidated Balance Sheets (Parentheticals)</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Nov. 30, 2010'</Log>
    <Log type="Info">Process Flow-Through: 003 - Statement - Consolidated Statements of Operations</Log>
    <Log type="Info">Process Flow-Through: 005 - Statement - Consolidated Statements of Cash Flows</Log>
  </Logs>
  <InputFiles>
    <File>mric-20141231.xml</File>
    <File>mric-20141231.xsd</File>
    <File>mric-20141231_cal.xml</File>
    <File>mric-20141231_def.xml</File>
    <File>mric-20141231_lab.xml</File>
    <File>mric-20141231_pre.xml</File>
  </InputFiles>
  <SupplementalFiles />
  <BaseTaxonomies />
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
