Acres of property.

No definition available.

Name:	MNR_AreaOfProperty
Namespace Prefix:	MNR_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of acquisition cost of a business combination allocated to buildings included in real estate.

+ References

No definition available.

+ Details

Name:	MNR_BusinessAcquisitionPurchasePriceAllocationBuilding
Namespace Prefix:	MNR_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Cost of building expansion.

+ References

No definition available.

+ Details

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Namespace Prefix:	MNR_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Dividend rate in percentage of preferred stock.

+ References

No definition available.

+ Details

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Namespace Prefix:	MNR_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Lease Expiration Date Description.

+ References

No definition available.

+ Details

Name:	MNR_LeaseExpirationDateDescription
Namespace Prefix:	MNR_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Lease term.

+ References

No definition available.

+ Details

Name:	MNR_LeaseTerm
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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents a settlement with former tenants for the early termination of a lease.

+ References

No definition available.

+ Details

Name:	MNR_LeaseTerminationIncome
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Mortgage loan on real estate expiration period.

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
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- Definition

Mortgage loan period.

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Net gain on historic cost undepreciated basis.

+ References

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage of building area leased.

+ References

No definition available.

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

- Definition

Percentage of gain on properties.

+ References

No definition available.

+ Details

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

- Definition

Percentage of net gain over the historic cost basis.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
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- Definition

Percentage of real estate property leased.

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No definition available.

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- Definition

Percentage of rental space and tenant account description.

+ References

No definition available.

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Data Type:	xbrli:stringItemType
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Period Type:	duration

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Percentage Of Un Depreciated Assets.

+ References

No definition available.

+ Details

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

- Definition

Expansion square feet.

+ References

No definition available.

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Period Type:	instant

- Definition

Square feet of real estate property leased.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Rent increased to after expansion.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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Rent increased to after expansion, per square foot.

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No definition available.

+ Details

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Data Type:	num:perShareItemType
Balance Type:	na
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Rent prior to expansion.

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No definition available.

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Balance Type:	credit
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Rent prior to expansion, per square foot.

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No definition available.

+ Details

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

- Definition

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

+ References

No definition available.

+ Details

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

- Definition

Sale of industrial building.

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No definition available.

+ Details

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Namespace Prefix:	MNR_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Area of land held.

+ References

No definition available.

+ Details

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

- Definition

The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

+ References

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-Paragraph 28
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Data Type:	xbrli:monetaryItemType
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- Definition

Date which lease or group of leases is set to expire, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

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

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-Name Accounting Standards Codification
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-Subparagraph (SX 210.5-04.(c) Schedule IV)
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Balance Type:	na
Period Type:	duration

- Definition

Total amount of new mortgage loans on real estate during the reporting period.

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-Name Accounting Standards Codification
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-SubTopic 310
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-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 55
-Paragraph 53
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-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980

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Balance Type:	na
Period Type:	duration

- Definition

Future minimum rental payments in aggregate as of the balance sheet date under operating leases.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84164653&loc=d3e41551-112718

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Balance Type:	debit
Period Type:	instant

- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717

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Balance Type:	debit
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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585

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Period Type:	duration

- Definition

Cash received on stock transaction after deduction of issuance costs.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Revenue from the sale of commercial, industrial, or residential property during the period. This element is more likely than not relevant to an entity for which real estate operations are a principal activity. If real estate operations are not a principal activity, the reporting entity would likely use a gain (loss) on sale of property, plant, or equipment type element.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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Name:	us-gaap_RealEstatePropertiesAxis=MNR_FDXAndSubsidiariesAndMilwaukeeElectricToolCorporationMember
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Real Estate Investments (Details Narrative)						3 Months Ended
Real Estate Investments (Details Narrative)	Dec. 22, 2017 USD ($)	Dec. 18, 2017 USD ($)	Nov. 30, 2017 USD ($) ft² a	Nov. 02, 2017 USD ($) ft² a $ / shares	Oct. 27, 2016 USD ($) ft² a	Dec. 31, 2017 USD ($) ft² a	Dec. 31, 2016 USD ($) ft²	Sep. 30, 2017 a
Transaction costs						$ 378,000
Total square foot of property \| a						19,096,000		18,790,000
Gain on real estate properties						$ 5,388,000
Percentage of gain on properties						105.00%
Net gain on historic cost						$ 1,804,000
Percentage of net gain over the historic cost basis						21.00%
Potential lease termination income						$ 210,261	$ 0
Weighted average lease maturity						7 years 10 months 25 days
Held marketable securities						$ 130,431,475
Percentage of un depreciated assets						7.80%
Series C Cumulative Redeemable Preferred Stock [Member]
Cumulative redeemable preferred, stock dividend rate						6.125%
Series A Cumulative Redeemable Preferred Stock [Member]
Cumulative redeemable preferred, stock dividend rate						7.625%
Series B Cumulative Redeemable Preferred Stock [Member]
Cumulative redeemable preferred, stock dividend rate						7.875%
FedEx Corporation [Member]
Percentage of real estate property leased						8.00%	6.00%
FedEx Corporation [Member] \| Rental And Reimbursement Revenue [Member] \| Fiscal Year 2018 [Member]
Percentage of aggregate rental and reimbursement revenue						7.00%
FedEx Corporation [Member] \| Rental And Reimbursement Revenue [Member] \| Fiscal Year 2017 [Member]
Percentage of aggregate rental and reimbursement revenue						6.00%
Kansas City, MO (Kellogg) [Member]
Total square foot of property \| a						65,067
Value of property sold		$ 4,900,000
Proceeds from sale of property		$ 4,602,000
Fedex Ground Package System Inc. [Member]
Lease term				10 years
Cost of building expansion				$ 1,683,000
Lease expiration date description				extended the prior lease expiration date from April 2024 to October 2027
Increase in rent				$ 184,000
Rent prior to expansion				$ 1,533,000
Rent prior to expansion, per square foot \| $ / shares				$ 4.67
Rent increase to after expansion				$ 1,717,000
Rent increase to after expansion, per square foot \| $ / shares				$ 5.24
Orangeburg NY [Member]
Total square foot of property \| a						50,400
Value of property sold	$ 6,170,000
Proceeds from sale of property	$ 5,898,000
Ft. Myers [Member]
Total square foot of property \| ft²						87,500
Colorado Springs, CO [Member]
Total square foot of property \| ft²						68,370
Fedex And Fedex Subsidiaries [Member]
Square feet of real estate property leased \| ft²						9,513,000	8,187,000
Weighted average lease maturity						8 years 8 months 12 days
Percentage of real estate property leased						50.00%	49.00%
Percentage of rental space and tenant account, description						only tenants that leased 5% or more of the Company’s total square footage
Fedex And Fedex Subsidiaries [Member] \| Rental And Reimbursement Revenue [Member]
Percentage of rental space and tenant account, description						No other tenant, other than FDX and its subsidiaries, accounted for 5% or more of the Company’s total Rental and Reimbursement Revenue
Fedex And Fedex Subsidiaries [Member] \| Rental And Reimbursement Revenue [Member] \| Fiscal Year 2018 [Member]
Percentage of aggregate rental and reimbursement revenue						60.00%
Fedex And Fedex Subsidiaries [Member] \| Rental And Reimbursement Revenue [Member] \| Fiscal Year 2017 [Member]
Percentage of aggregate rental and reimbursement revenue						59.00%
Fedex Corporation Subsidiaries Member [Member]
Percentage of real estate property leased						42.00%	43.00%
Fedex Corporation Subsidiaries Member [Member] \| Rental And Reimbursement Revenue [Member] \| Fiscal Year 2018 [Member]
Percentage of aggregate rental and reimbursement revenue						53.00%
Fedex Corporation Subsidiaries Member [Member] \| Rental And Reimbursement Revenue [Member] \| Fiscal Year 2017 [Member]
Percentage of aggregate rental and reimbursement revenue						53.00%
FDX And Subsidiaries And Milwaukee Electric Tool Corporation [Member]
Total square foot of property \| ft²						862,000
Percentage of rental space and tenant account, description						accounted for 5% or more of the Company’s total rental space
Industrial Buildings [Member] \| FedEx Corporation [Member]
Purchase of industrial building \| ft²				121,683
Area of property \| a				16.2
Percentage of building area leased				100.00%
Lease term				15 years
Lease term expiration period				Aug. 31, 2032
Purchase price of industrial building				$ 21,872,170
Mortgage loan amortization period				15 years
Face amount of mortgages				$ 14,200,000
Mortgage loans on real estate, interest rate				4.23%
Annual rental income over the remaining term of lease				$ 1,312,000
Industrial Buildings [Member] \| Amazon.com Services, Inc [Member]
Purchase of industrial building \| ft²			300,000
Area of property \| a			123
Percentage of building area leased			100.00%
Lease term			10 years
Lease term expiration period			Oct. 31, 2027
Purchase price of industrial building			$ 30,250,000
Mortgage loan amortization period			18 years
Face amount of mortgages			$ 19,600,000
Mortgage loans on real estate, interest rate			3.64%
Annual rental income over the remaining term of lease			$ 1,884,000
Mortgage loan period			10 years
Industrial Buildings [Member] \| Shaw Industries, Inc [Member] \| January 22, 2018 [Member]
Purchase of industrial building \| ft²						831,764
Area of property \| a						62.4
Percentage of building area leased						100.00%
Lease term						10 years
Lease term expiration period						Sep. 30, 2027
Purchase price of industrial building						$ 57,483,636
Mortgage loan amortization period						14 years
Face amount of mortgages						$ 33,300,000
Mortgage loans on real estate, interest rate						3.53%
Annual rental income over the remaining term of lease						$ 3,470,000
Industrial Buildings [Member] \| White Bear Lake, MN [Member]
Area of property \| a					4.78
Proceeds from sale of property					$ 4,126,000
Sale of industrial building \| ft²					59,425