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Condensed Income Statements (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Revenue:        
Rental income $ 19,465 $ 16,721 $ 38,254 $ 32,728
Sales, net 2,275 3,329 5,613 11,164
Service and maintenance income 212 208 407 349
Total revenue 21,952 20,258 44,274 44,241
Operating costs and expenses:        
Cost of rentals, exclusive of depreciation stated separately below 7,749 6,258 15,705 13,070
Cost of sales, exclusive of depreciation stated separately below 1,098 1,600 3,333 6,482
Cost of service and maintenance, exclusive of depreciation and amortization stated separately below 84 85 168 153
Selling, general, and administrative expense 2,690 2,035 5,333 3,881
Depreciation and amortization 5,246 4,436 10,288 8,674
Total operating costs and expenses 16,867 14,414 34,827 32,260
Operating income 5,085 5,844 9,447 11,981
Other income (expense):        
Interest expense (3) (11) (5) (42)
Other income (expense) 47 (68) 52 268
Total other income (expense), net 44 (79) 47 226
Income before provision for income taxes 5,129 5,765 9,494 12,207
Provision for income taxes 1,744 1,921 3,253 4,369
Net income $ 3,385 $ 3,844 $ 6,241 $ 7,838
Earnings per share:        
Basic (in USD per share) $ 0.27 $ 0.31 $ 0.50 $ 0.64
Diluted (in USD per share) $ 0.27 $ 0.31 $ 0.49 $ 0.63
Weighted average shares outstanding:        
Basic (in shares) 12,436 12,316 12,405 12,299
Diluted (in shares) 12,752 12,518 12,722 12,447