Name:	mnr_BusinessAcquisitionAreaOfRealEstatePropertyAcquired
Namespace Prefix:	mnr_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	duration

- Definition

Business acquisition cost of acquired entity purchase price adjusted.

+ References

No definition available.

+ Details

Name:	mnr_BusinessAcquisitionCostOfAcquiredEntityPurchasePriceAdjusted
Namespace Prefix:	mnr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Business acquisition cost of acquired entity refund purchase price .

+ References

No definition available.

+ Details

Name:	mnr_BusinessAcquisitionCostOfAcquiredEntityRefundPurchasePrice
Namespace Prefix:	mnr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Description of expected completion time of building.

+ References

No definition available.

+ Details

Name:	mnr_DescriptionOfExpectedCompletionTimeOfBuilding
Namespace Prefix:	mnr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of real estate property leased to other tenants.

+ References

No definition available.

+ Details

Name:	mnr_DescriptionOfRealEstatePropertyLeasedToOtherTenants
Namespace Prefix:	mnr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Mortgage balance refund as reduction.

+ References

No definition available.

+ Details

Name:	mnr_MortgageBalanceRefundAsReduction
Namespace Prefix:	mnr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Mortgage Loans on Real Estate, Term of loan.

+ References

No definition available.

+ Details

Name:	mnr_MortgageLoansOnRealEstateTermOfLoan
Namespace Prefix:	mnr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of Real Estate Property leased.

+ References

No definition available.

+ Details

Name:	mnr_PercentageOfRealEstatePropertyLeased
Namespace Prefix:	mnr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Purchase price reduction, amount required to be used to pay down mortgage balance.

+ References

No definition available.

+ Details

Name:	mnr_PurchasePriceReductionAmountRequiredToBeUsedToPayDownMortgageBalance
Namespace Prefix:	mnr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	mnr_RealEstateInvestmentsTextualAbstract
Namespace Prefix:	mnr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Expected revenue as percentage of aggregate rental and reimbursement revenue in year two.

+ References

No definition available.

+ Details

Name:	mnr_RevenueAsPercentageOfAggregateRentalAndReimbursementRevenue
Namespace Prefix:	mnr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Tenant Concentration, number of lease contracts.

+ References

No definition available.

+ Details

Name:	mnr_TenantConcentrationNumberOfLeaseContracts
Namespace Prefix:	mnr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-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.

+ Details

Name:	us-gaap_BusinessAcquisitionCostOfAcquiredEntityPurchasePrice
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This element represents the amount of value allocated by a lessor (acquirer) to lease agreements which exist at acquisition of a leased property. Such amount may include the value assigned to existing tenant relationships and excludes the market adjustment component of the value assigned for above or below-market leases acquired.

+ References

No definition available.

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetAcquiredInPlaceLeases
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Stated maturity date of the mortgage loan receivable on real estate, in CCYY-MM-DD format.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 948

-SubTopic 310

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-29)

-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

-Paragraph 6

-Subparagraph (SX 210.5-04.(c) Schedule IV)

-URI http://asc.fasb.org/extlink&oid=6882300&loc=d3e5864-122674

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 29

-Article 12

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule IV

-Article 5

+ Details

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

- Definition

The carrying amount of the outstanding balance due under the mortgage loan.

+ References

+ Details

Name:	us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The stated interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans.

+ References

+ Details

Name:	us-gaap_MortgageLoansOnRealEstateInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of cash paid for brokerage fees during the current period. This element is intended to represent the brokerage fees paid by and between financial industry participants.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3536-108585

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 27

-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.

+ Details

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

Real Estate Investments (Details Textual) (USD $)	6 Months Ended	1 Months Ended		1 Months Ended	3 Months Ended		1 Months Ended	6 Months Ended		1 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended		1 Months Ended	6 Months Ended
Real Estate Investments (Details Textual) (USD $)	Mar. 31, 2013	Nov. 30, 2012 Livonia, MI [Member] sqft	Nov. 09, 2012 Livonia, MI [Member]	Dec. 31, 2012 Olive Branch, Mississippi [Member] sqft	Mar. 31, 2013 Olive Branch, Mississippi [Member]	Dec. 20, 2012 Olive Branch, Mississippi [Member]	Dec. 31, 2012 Orion, MI [Member] acre sqft	Mar. 31, 2013 Orion, MI [Member]	Dec. 21, 2012 Orion, MI [Member]	Dec. 31, 2012 Fedex Corporation [Member]	Mar. 31, 2013 Fedex Corporation [Member]	Dec. 31, 2012 Fedex Corporation Subsidiaries [Member]	Mar. 31, 2013 Fedex Corporation Subsidiaries [Member]	Mar. 31, 2013 Milwaukee Electric Tool Corporation [Member]	Dec. 31, 2012 Fedex and Fedex Subsidiaries [Member]	Mar. 31, 2013 Fedex and Fedex Subsidiaries [Member] Lease_Contracts
Real Estate Investments (Textual)
Area of real estate property acquired		172,005		615,305			4.1
Percentage of real estate property leased		100.00%		100.00%						10.00%		31.00%		7.00%	41.00%
Expected revenue as percentage of aggregate rental and reimbursement revenue in next fiscal year											12.00%		40.00%			52.00%
Purchase price of properties acquired			$ 14,350,000			$ 28,000,000			$ 988,300
Business acquisition cost of acquired entity purchase price adjusted					27,368,816
Business acquisition cost of acquired entity refund purchase price					631,184
Mortgage balance refund as reduction					394,490
Mortgage loans on real estate, carrying amount of mortgages			9,500,000			17,500,000
Purchase price reduction, amount required to be used to pay down mortgage balance					62.50%
Mortgage loans on real estate, interest rate		4.45%		3.76%
Mortgage loans on real estate, term of loan		14 years		10 years
Mortgage maturity date		Dec. 01, 2026		Jan. 01, 2023
Annual rental income		1,194,000		1,965,000
Annual rental income adjusted				1,928,000
Intangible asset related to the lease in-place			650,000
Payment for mortgage brokerage commissions to former management agent		$ 95,000
Area of building to be expanded							52,154
Description of expected completion time of building								In fiscal 2013
Tenant Concentration, number of lease contracts																37
Description of real estate property leased to other tenants	No other tenants leased more than 5% of the Company's total square footage with the exception of Milwaukee Electric Tool Corporation which leased 7%.