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Securities Available for Sale at Fair Value (Details Textual) (USD $)
6 Months Ended
Mar. 31, 2015
Security
Mar. 31, 2014
Sep. 30, 2014
Securities Available for Sale (Textual)      
REIT investment securities, Description The Company also owns a portfolio of REIT investment securities which the Company generally limits to no more than approximately 10% of its undepreciated assets.    
Common shares of UMH's related to Dividend Reinvestment 34,030mnr_CommonStockSharesPurchases    
Cost of securities purchased $ 306,258us-gaap_AvailableForSaleSecuritiesAmortizedCost    
Weighted average cost per share $ 9.00mnr_DividendReinvestmentAndStockPurchasePlanWeightedAverageCostPerShare    
Securities available for sale at fair value 52,506,095us-gaap_AvailableForSaleSecurities   59,311,403us-gaap_AvailableForSaleSecurities
Proceeds from sales or redemptions of securities available for sale 9,207,425us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities    
Gain on sale of securities available for sale 377,087us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet    
Purchase of securities available for sale 1,244,580us-gaap_PaymentsToAcquireAvailableForSaleSecurities 13,258,470us-gaap_PaymentsToAcquireAvailableForSaleSecurities  
Number of securities held as temporarily impaired investments 6mnr_SecuritiesHeldAsTemporarilyImpairedInvestments    
Total net unrealized gains on securities portfolio 1,278,893us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1    
Unrealized Losses (1,629,218)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses    
Common stock [Member]      
Securities Available for Sale (Textual)      
UMH shares owned by company 876,206us-gaap_InvestmentOwnedBalanceShares
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
   
UMH shares owned, value 8,209,551us-gaap_InvestmentOwnedBalancePrincipalAmount
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
   
Series A Cumulative Redeemable Preferred Stock of UMH's [Member]      
Securities Available for Sale (Textual)      
Available for sale securities, Shares 200,000mnr_AvailableForSaleSecuritiesShares
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_SeriesAPreferredStockMember
   
Cost of securities purchased 5,000,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_SeriesAPreferredStockMember
   
Dividend rate of preferred stock held as security for loan 8.25%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_SeriesAPreferredStockMember
   
Securities available for sale at fair value 5,188,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_SeriesAPreferredStockMember
   
Preferred Stock [Member]      
Securities Available for Sale (Textual)      
Dividend rate of preferred stock held as security for loan 8.25%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_PreferredStockMember
   
Investment in UMH Common Shares [Member]      
Securities Available for Sale (Textual)      
Securities available for sale at fair value $ 8,823,399us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mnr_InvestmentInUmhCommonSharesMember