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Stockholders' Equity Stockholders' Equity (Details) (USD $)
1 Months Ended 12 Months Ended 0 Months Ended 2 Months Ended
Dec. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Feb. 25, 2015
Jan. 23, 2015
Mar. 10, 2015
Feb. 17, 2015
Class of Stock [Line Items]                
Preferred stock, shares issued 40,000us-gaap_PreferredStockSharesIssued 40,000us-gaap_PreferredStockSharesIssued 40,000us-gaap_PreferredStockSharesIssued          
Preferred stock, shares outstanding 40,000us-gaap_PreferredStockSharesOutstanding 40,000us-gaap_PreferredStockSharesOutstanding 40,000us-gaap_PreferredStockSharesOutstanding          
Preferred stock, par value (in dollars per share) $ 10.00us-gaap_PreferredStockParOrStatedValuePerShare $ 10.00us-gaap_PreferredStockParOrStatedValuePerShare $ 10.00us-gaap_PreferredStockParOrStatedValuePerShare          
Common stock, shares issued in connection with dividend reinvestment and stock purchase plan   3,324us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan 2,271us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan 5,877us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan        
Purchase of treasury stock (shares) 12,300us-gaap_TreasuryStockSharesAcquired 12,300us-gaap_TreasuryStockSharesAcquired 0us-gaap_TreasuryStockSharesAcquired 0us-gaap_TreasuryStockSharesAcquired        
Stock repurchased during period $ 319,000us-gaap_TreasuryStockValueAcquiredCostMethod              
Dividend Reinvestment and Stock Purchase Plan [Member]                
Class of Stock [Line Items]                
Common stock, shares issued in connection with dividend reinvestment and stock purchase plan   3,474.000us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan
/ us-gaap_PlanNameAxis
= metr_DividendReinvestmentAndStockPurchasePlanMember
2,311us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan
/ us-gaap_PlanNameAxis
= metr_DividendReinvestmentAndStockPurchasePlanMember
5,917us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan
/ us-gaap_PlanNameAxis
= metr_DividendReinvestmentAndStockPurchasePlanMember
       
Dividend reinvestment plan, shares authorized 510,000metr_DividendReinvestmentPlanSharesAuthorized
/ us-gaap_PlanNameAxis
= metr_DividendReinvestmentAndStockPurchasePlanMember
510,000metr_DividendReinvestmentPlanSharesAuthorized
/ us-gaap_PlanNameAxis
= metr_DividendReinvestmentAndStockPurchasePlanMember
           
Dividend Reinvestment and Stock Purchase Plan [Member] | Minimum [Member]                
Class of Stock [Line Items]                
Stock issued during period, value, dividend reinvestment plan, monthly limitations   100metr_StockIssuedDuringPeriodValueDividendReinvestmentPlanMonthlyLimitations
/ us-gaap_PlanNameAxis
= metr_DividendReinvestmentAndStockPurchasePlanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
           
Dividend Reinvestment and Stock Purchase Plan [Member] | Minimum [Member] | Employees [Member]                
Class of Stock [Line Items]                
Stock issued during period, value, dividend reinvestment plan, monthly limitations   25metr_StockIssuedDuringPeriodValueDividendReinvestmentPlanMonthlyLimitations
/ us-gaap_PlanNameAxis
= metr_DividendReinvestmentAndStockPurchasePlanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TitleOfIndividualAxis
= metr_EmployeesMember
           
Dividend Reinvestment and Stock Purchase Plan [Member] | Minimum [Member] | Officers [Member]                
Class of Stock [Line Items]                
Stock issued during period, value, dividend reinvestment plan, monthly limitations   50metr_StockIssuedDuringPeriodValueDividendReinvestmentPlanMonthlyLimitations
/ us-gaap_PlanNameAxis
= metr_DividendReinvestmentAndStockPurchasePlanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_OfficerMember
           
Dividend Reinvestment and Stock Purchase Plan [Member] | Maximum [Member]                
Class of Stock [Line Items]                
Stock issued during period, value, dividend reinvestment plan, monthly limitations   10,000metr_StockIssuedDuringPeriodValueDividendReinvestmentPlanMonthlyLimitations
/ us-gaap_PlanNameAxis
= metr_DividendReinvestmentAndStockPurchasePlanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
           
Series A Preferred Stock [Member]                
Class of Stock [Line Items]                
Preferred stock, shares issued 40,000us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
40,000us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
40,000us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
         
Preferred stock, shares outstanding 40,000us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
40,000us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
40,000us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
         
Preferred stock, par value (in dollars per share) $ 10us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
$ 10us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
$ 10us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
         
Preferred stock, redemption price per share $ 25us-gaap_PreferredStockRedemptionPricePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
$ 25us-gaap_PreferredStockRedemptionPricePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
           
Dividends payable, amount per share $ 2us-gaap_DividendsPayableAmountPerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
$ 2us-gaap_DividendsPayableAmountPerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
           
Subsequent Event [Member]                
Class of Stock [Line Items]                
Purchase of treasury stock (shares)             117,000us-gaap_TreasuryStockSharesAcquired
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Common Stock, Dividends, Per Share, Declared           $ 0.07us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Dividends, Common Stock, Cash         993,000us-gaap_DividendsCommonStockCash
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Stock repurchased during period             $ 3,000,000us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Investor, Ownership Percentage in Company Stock               50.00%metr_InvestorOwnershipPercentageinCompanyStock
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Prior to Flip-in Date [Member] | Director [Member] | Subsequent Event [Member]                
Class of Stock [Line Items]                
Class of Warrant or Right, Exercise Price of Warrants or Rights               0.001us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_AwardDateAxis
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/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
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/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Flip-in Date [Member] | Subsequent Event [Member]                
Class of Stock [Line Items]                
Class of Warrant or Right, Exercise Price of Warrants or Rights               100.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_AwardDateAxis
= metr_FlipinDateMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Flip-in Date [Member] | Subsequent Event [Member] | Minimum [Member]                
Class of Stock [Line Items]                
Investor, Ownership Percentage in Company Stock               15.00%metr_InvestorOwnershipPercentageinCompanyStock
/ us-gaap_AwardDateAxis
= metr_FlipinDateMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Flip-in Date [Member] | Subsequent Event [Member] | Maximum [Member]                
Class of Stock [Line Items]                
Investor, Ownership Percentage in Company Stock               50.00%metr_InvestorOwnershipPercentageinCompanyStock
/ us-gaap_AwardDateAxis
= metr_FlipinDateMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_SubsequentEventTypeAxis
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