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Receivables From And Payables To Brokers, Dealers, And Clearing Agencies (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Receivables From And Payables To Brokers, Dealers, And Clearing Agencies [Abstract] |  |  |
Interest On Margin Payable | $ 548 | $ 447 | $ 627

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- Definition Interest On Margin Payable + References No definition available. + Details
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Namespace Prefix: | ifmi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration