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Receivables From And Payables To Brokers, Dealers, And Clearing Agencies (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	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

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No definition available.

+ Details

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Namespace Prefix:	ifmi_
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Balance Type:	debit
Period Type:	duration

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No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration