SUMMARY OF INCOME FROM PROPERTY IS EXPECTED TO BE SOLD DURING THE SECOND QUARTER (Details) - USD ($) $ in Thousands	3 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Real Estate [Abstract]
Rental and Reimbursement Revenue	$ 112	$ 107
Real Estate Taxes	(23)	(22)
Operating Expenses	(13)	(8)
Depreciation & Amortization	(25)	(25)
Net Income	$ 51	$ 52

The pro formo depreciation and amortization for a period as if the business combination or combinations had been completed at the begining of the period.

No definition available.

Name:	mnr_BusinessAcquisitionsProFormaDepreciationAndAmortization
Namespace Prefix:	mnr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration