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Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Revenue:      
Rental income $ 78,983us-gaap_OperatingLeasesIncomeStatementLeaseRevenue $ 69,062us-gaap_OperatingLeasesIncomeStatementLeaseRevenue $ 56,477us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
Sales 17,200us-gaap_SalesRevenueGoodsNet 19,479us-gaap_SalesRevenueGoodsNet 36,375us-gaap_SalesRevenueGoodsNet
Service and maintenance income 791us-gaap_SalesRevenueServicesNet 707us-gaap_SalesRevenueServicesNet 870us-gaap_SalesRevenueServicesNet
Total revenue 96,974us-gaap_SalesRevenueNet 89,248us-gaap_SalesRevenueNet 93,722us-gaap_SalesRevenueNet
Operating costs and expenses:      
Cost of rentals, exclusive of depreciation stated separately below 31,522us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment 29,017us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment 23,737us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment
Cost of sales, exclusive of depreciation stated separately below 11,297us-gaap_OtherCostOfOperatingRevenue 11,582us-gaap_OtherCostOfOperatingRevenue 25,816us-gaap_OtherCostOfOperatingRevenue
Cost of service and maintenance, exclusive of depreciation stated separately below 328us-gaap_OtherCostOfServices 344us-gaap_OtherCostOfServices 354us-gaap_OtherCostOfServices
Selling, general, and administrative expenses 10,334us-gaap_SellingGeneralAndAdministrativeExpense 8,141us-gaap_SellingGeneralAndAdministrativeExpense 7,893us-gaap_SellingGeneralAndAdministrativeExpense
Depreciation and amortization 21,507us-gaap_DepreciationDepletionAndAmortization 18,144us-gaap_DepreciationDepletionAndAmortization 15,707us-gaap_DepreciationDepletionAndAmortization
Total operating costs and expenses 74,988us-gaap_CostsAndExpenses 67,228us-gaap_CostsAndExpenses 73,507us-gaap_CostsAndExpenses
Operating income 21,986us-gaap_OperatingIncomeLoss 22,020us-gaap_OperatingIncomeLoss 20,215us-gaap_OperatingIncomeLoss
Other income (expense):      
Interest expense (10)us-gaap_InterestExpense (56)us-gaap_InterestExpense (18)us-gaap_InterestExpense
Other income 182us-gaap_OtherNonoperatingIncomeExpense 548us-gaap_OtherNonoperatingIncomeExpense 14us-gaap_OtherNonoperatingIncomeExpense
Total other income (expense) 172us-gaap_NonoperatingIncomeExpense 492us-gaap_NonoperatingIncomeExpense (4)us-gaap_NonoperatingIncomeExpense
Income before provision for income taxes 22,158us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 22,512us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 20,211us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Provision for income taxes:      
Current 1,190us-gaap_CurrentIncomeTaxExpenseBenefit 399us-gaap_CurrentIncomeTaxExpenseBenefit 554us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred 6,840us-gaap_DeferredIncomeTaxExpenseBenefit 7,723us-gaap_DeferredIncomeTaxExpenseBenefit 6,972us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax expense 8,030us-gaap_IncomeTaxExpenseBenefit 8,122us-gaap_IncomeTaxExpenseBenefit 7,526us-gaap_IncomeTaxExpenseBenefit
Net income $ 14,128us-gaap_NetIncomeLoss $ 14,390us-gaap_NetIncomeLoss $ 12,685us-gaap_NetIncomeLoss
Earnings per common share:      
Net income per share - Basic (in dollars per share) $ 1.14us-gaap_EarningsPerShareBasic $ 1.17us-gaap_EarningsPerShareBasic $ 1.04us-gaap_EarningsPerShareBasic
Net income per share - Diluted (in dollars per share) $ 1.11us-gaap_EarningsPerShareDiluted $ 1.15us-gaap_EarningsPerShareDiluted $ 1.03us-gaap_EarningsPerShareDiluted
Weighted average shares outstanding:      
Weighted average common shares outstanding, Basic (in shares) 12,434us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 12,324us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 12,220us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted average common shares outstanding, Diluted (in shares) 12,721us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 12,550us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 12,320us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding