Investment in Service Contracts, net (Details) (Service contracts [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Service contracts [Member]
Investment in service contracts
Investment in service contracts	$ 1,495	$ 821
Less accumulated amortization	(698)	(821)
Investment in service contracts, net	$ 797

Investment in service contracts accumulated amortization.

No definition available.

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