Line of credit basis spread on federal funds rate.

No definition available.

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Namespace Prefix:	mfi_
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Period Type:	duration

- Definition

Line of credit basis spread on London interbank offered rate.

+ References

No definition available.

+ Details

Name:	mfi_LineOfCreditBasisSpreadOnLondonInterbankOfferedRate
Namespace Prefix:	mfi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line of credit facility description of variable rate basis.

+ References

No definition available.

+ Details

Name:	mfi_LineOfCreditFacilityDescriptionOfVariableRateBasis
Namespace Prefix:	mfi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of credit facility outstanding LIBOR loan amount.

+ References

No definition available.

+ Details

Name:	mfi_LineOfCreditFacilityOutstandingLiborLoanAmount
Namespace Prefix:	mfi_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

Line of credit facility outstanding prime rate loan amount.

+ References

No definition available.

+ Details

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

- Definition

Qualified lease receivables eligible under borrowing base.

+ References

No definition available.

+ Details

Name:	mfi_QualifiedLeaseReceivablesEligibleUnderBorrowingBase
Namespace Prefix:	mfi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	mfi_RevolvingLineOfCreditAdditionalTextualAbstract
Namespace Prefix:	mfi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	mfi_RevolvingLineOfCreditTextualAbstract
Namespace Prefix:	mfi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Term loan period for converted unpaid balance.

+ References

No definition available.

+ Details

Name:	mfi_TermLoanPeriodForConvertedUnpaidBalance
Namespace Prefix:	mfi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

The percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

When presenting a range of interest rates, the lowest effective rate for funds borrowed under the debt agreement as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount borrowed under the credit facility as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityAmountOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Increase for additional borrowings on the credit facility during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(f))

-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph f

-Article 4

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The effective interest rate at the end of the reporting period.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Revolving Line of Credit (Details Textual) (USD $)	2 Months Ended	7 Months Ended	10 Months Ended	12 Months Ended
Revolving Line of Credit (Details Textual) (USD $)	Feb. 28, 2009	Jul. 31, 2010	Oct. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Aug. 02, 2007
Revolving Line of Credit (Textual) [Abstract]
Interest rate on line of credit borrowings	Prime plus 1.75% or LIBOR plus 3.75%	Prime plus 1.25% or LIBOR plus 3.25%	Prime plus 0.75% or LIBOR plus 2.75%	Base plus 0.75% or LIBOR plus 2.5%
Borrowing capacity under revolving line of credit	$ 85,000,000	$ 100,000,000	$ 100,000,000	$ 150,000,000		$ 30,000,000
Revolving Line of Credit (Additional Textual) [Abstract]
Revolving line of credit - Sovereign				70,380,000	62,740,000
Minimum Interest rate on line of credit borrowings	5.00%
Line of credit facility outstanding LIBOR loan amount				65,000,000
Line of credit facility outstanding Base Rate Loan amount				5,400,000
Available on revolving line of credit				79,600,000
Further increases in total commitment				175,000,000
Amount outstanding on line of credit				70,400,000
Term loan period for converted unpaid balance				6 months
Maturity date of the facility	Aug. 31, 2010	Aug. 31, 2013	Aug. 31, 2014	Dec. 31, 2016
Base rate				The “base rate” is the highest of the prime rate established by the Agent, or one-month LIBOR plus 1%, or the federal funds effective rate plus 0.5%.
Federal funds				0.50%
The base rate established by the Agent				1.00%
Qualified lease receivables eligible under the borrowing base computation				130,800,000
Prime [Member]
Revolving Line of Credit (Textual) [Abstract]
Spread on interest Rate on line of credit borrowings	1.75%	1.25%	0.75%
LIBOR [Member]
Revolving Line of Credit (Textual) [Abstract]
Spread on interest Rate on line of credit borrowings	3.75%	3.25%	2.75%	2.50%
Base [Member]
Revolving Line of Credit (Textual) [Abstract]
Spread on interest Rate on line of credit borrowings				0.75%
Maximum [Member]
Revolving Line of Credit (Textual) [Abstract]
Interest rate on loans				4.00%
Borrowing capacity under revolving line of credit				150,000,000
Minimum [Member]
Revolving Line of Credit (Textual) [Abstract]
Interest rate on loans	5.00%			2.96%
Borrowing capacity under revolving line of credit				$ 100,000,000