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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue:      
Revenues $ 65,478 $ 67,693 $ 71,654
Operating costs and expenses:      
Cost of rentals, exclusive of depreciation stated separately below 20,746 18,087 20,350
Cost of sales, exclusive of depreciation stated separately below 12,564 16,286 11,124
Cost of service and maintenance, exclusive of depreciation stated separately below 385 370 398
Loss on retirement of rental equipment 0 0 545
Selling, general and administrative expenses 9,096 10,081 9,011
Depreciation and amortization 22,049 21,302 21,796
Total operating costs and expenses 64,840 66,126 63,224
Operating income 638 1,567 8,430
Other income      
Interest expense (69) (14) (8)
Other income 182 50 43
Total other income, net 113 36 35
Income before provision for income taxes 751 1,603 8,465
Provision for income taxes      
Current (248) 3,334 4,709
Deferred 573 (21,582) (2,713)
Total income tax expense (benefit) 325 (18,248) 1,996
Net income $ 426 $ 19,851 $ 6,469
Earnings per share:      
Earnings per share - Basic (in dollars per share) $ 0.03 $ 1.55 $ 0.51
Earnings per share - Diluted (in dollars per share) $ 0.03 $ 1.51 $ 0.50
Weighted average shares outstanding:      
Weighted average shares outstanding, Basic (in shares) 12,965 12,831 12,702
Weighted average shares outstanding, Diluted (in shares) 13,233 13,110 12,935
Rental income      
Revenue:      
Revenues $ 47,766 $ 46,046 $ 56,717
Sales      
Revenue:      
Revenues 16,269 20,208 13,621
Service and maintenance income      
Revenue:      
Revenues $ 1,443 $ 1,439 $ 1,316