Investment in Rental Contracts, net (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Investment in rental contracts
Investment in rental contracts	$ 3,163	$ 3,023
Less accumulated depreciation	(2,126)	(2,125)
Investment in rental contracts, net	$ 1,037	$ 898

Investment in rental contracts accumulated amortization.

No definition available.

Name:	mfi_InvestmentInRentalContractsAccumulatedAmortization
Namespace Prefix:	mfi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant