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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenue:      
Rental income $ 46,046 $ 56,717 $ 76,432
Sales 20,208 13,621 18,519
Service and maintenance income 1,439 1,316 968
Total revenue 67,693 71,654 95,919
Operating costs and expenses:      
Cost of rentals, exclusive of depreciation stated separately below 18,087 20,350 28,750
Cost of sales, exclusive of depreciation stated separately below 16,286 11,124 13,633
Cost of service and maintenance, exclusive of depreciation stated separately below 370 398 272
Loss on retirement of rental equipment 0 545 4,370
Selling, general, and administrative expenses 10,081 9,011 10,989
Depreciation and amortization 21,302 21,796 22,758
Total operating costs and expenses 66,126 63,224 80,772
Operating income 1,567 8,430 15,147
Other income (expense):      
Interest expense (14) (8) (15)
Other income 50 43 132
Total other income, net 36 35 117
Income before provision for income taxes 1,603 8,465 15,264
Provision for income taxes:      
Current 3,334 4,709 6,963
Deferred (21,582) (2,713) (1,846)
Total income tax expense (benefit) (18,248) 1,996 5,117
Net income $ 19,851 $ 6,469 $ 10,147
Earnings per share:      
Earnings per share - Basic (in dollars per share) $ 1.55 $ 0.51 $ 0.81
Earnings per share - Diluted (in dollars per share) $ 1.51 $ 0.50 $ 0.79
Weighted average shares outstanding:      
Weighted average shares outstanding, Basic (in shares) 12,831 12,702 12,567
Weighted average shares outstanding, Diluted (in shares) 13,110 12,935 12,793