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Summary of Significant Accounting Policies (Reconciliation of Net Income (Loss) Reported in Financial Statements and Federal Tax Return) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Summary of Significant Accounting Policies [Abstract]    
Net income per financial statements $ 2,156us-gaap_NetIncomeLoss $ 3,586us-gaap_NetIncomeLoss
Adjustment to depreciation expense 395us-gaap_IncomeTaxReconciliationNondeductibleExpenseDepreciation 542us-gaap_IncomeTaxReconciliationNondeductibleExpenseDepreciation
Provision for losses and doubtful accounts (3)zzhjb_IncomeTaxReconciliationProvisionForDoubtfulAccounts (7)zzhjb_IncomeTaxReconciliationProvisionForDoubtfulAccounts
Adjustments to revenues / other expenses (24)us-gaap_IncomeTaxReconciliationOtherAdjustments 37us-gaap_IncomeTaxReconciliationOtherAdjustments
Adjustments to gain on sales of assets 673us-gaap_IncomeTaxReconciliationDispositionOfAssets 656us-gaap_IncomeTaxReconciliationDispositionOfAssets
Income per federal tax return (unaudited) $ 3,197zzhjb_IncomeOrLossPerFederalTaxReturn $ 4,814zzhjb_IncomeOrLossPerFederalTaxReturn