Annual report pursuant to Section 13 and 15(d)

Related Person Transactions (Details)

v2.4.1.9
Related Person Transactions (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Related Party Transaction [Line Items]      
Rental service charge $ 17,500us-gaap_RevenueFromRelatedParties $ 18,000us-gaap_RevenueFromRelatedParties $ 18,000us-gaap_RevenueFromRelatedParties
Purchase of maintenance and other services $ 298,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty $ 299,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty $ 239,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty