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Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Revenue:      
Rental income $ 76,432 $ 78,983 $ 69,062
Sales 18,519 17,200 19,479
Service and maintenance income 968 791 707
Total revenue 95,919 96,974 89,248
Operating costs and expenses:      
Cost of rentals, exclusive of depreciation stated separately below 28,750 31,522 29,017
Cost of sales, exclusive of depreciation stated separately below 13,633 11,297 11,582
Cost of service and maintenance, exclusive of depreciation stated separately below 272 328 344
Loss on retirement of rental equipment 4,370 0 0
Selling, general, and administrative expenses 10,989 10,334 8,141
Depreciation and amortization 22,758 21,507 18,144
Total operating costs and expenses 80,772 74,988 67,228
Operating income 15,147 21,986 22,020
Other income (expense):      
Interest expense (15) (10) (56)
Other income 132 182 548
Total other income, net 117 172 492
Income before provision for income taxes 15,264 22,158 22,512
Provision for income taxes:      
Current 6,963 1,190 399
Deferred (1,846) 6,840 7,723
Total income tax expense 5,117 8,030 8,122
Net income $ 10,147 $ 14,128 $ 14,390
Earnings per share:      
Earnings per share - Basic (in dollars per share) $ 0.81 $ 1.14 $ 1.17
Earnings per share - Diluted (in dollars per share) $ 0.79 $ 1.11 $ 1.15
Weighted average shares outstanding:      
Weighted average common shares outstanding, Basic (in shares) 12,567 12,434 12,324
Weighted average common shares outstanding, Diluted (in shares) 12,793 12,721 12,550