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Segment Information (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
segment
Sep. 30, 2013
Segment Reporting Information [Line Items]        
Number of operating segments     1  
Revenue $ 25,599,000 $ 21,865,000 $ 69,873,000 $ 66,106,000
Operating costs and expenses 19,759,000 16,777,000 54,586,000 49,036,000
Other income, net 127,000 122,000 174,000 348,000
Income before provision for income taxes 5,967,000 5,210,000 15,461,000 17,418,000
Rental
        
Segment Reporting Information [Line Items]        
Revenue 20,177,000 17,805,000 58,431,000 50,533,000
Operating costs and expenses 8,110,000 7,449,000 23,815,000 20,519,000
Other income, net 0 0 0 0
Income before provision for income taxes 12,067,000 10,356,000 34,616,000 30,014,000
Sales
        
Segment Reporting Information [Line Items]        
Revenue 5,218,000 3,893,000 10,831,000 15,057,000
Operating costs and expenses 3,493,000 2,454,000 6,826,000 8,935,000
Other income, net 0 0 0 0
Income before provision for income taxes 1,725,000 1,439,000 4,005,000 6,122,000
Service & Maintenance
        
Segment Reporting Information [Line Items]        
Revenue 204,000 167,000 611,000 516,000
Operating costs and expenses 101,000 80,000 269,000 233,000
Other income, net 0 0 0 0
Income before provision for income taxes 103,000 87,000 342,000 283,000
Corporate
        
Segment Reporting Information [Line Items]        
Revenue 0 0 0 0
Operating costs and expenses 8,055,000 6,794,000 23,676,000 19,349,000
Other income, net 127,000 122,000 174,000 348,000
Income before provision for income taxes $ (7,928,000) $ (6,672,000) $ (23,502,000) $ (19,001,000)