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Condensed Consolidated Income Statements (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Revenue:        
Rental income $ 11,420 $ 14,655 $ 23,342 $ 31,063
Sales 4,407 2,300 11,044 7,210
Service and maintenance income 391 239 734 497
Total revenue 16,218 17,194 35,120 38,770
Operating costs and expenses:        
Cost of rentals, exclusive of depreciation stated separately below 4,255 5,411 8,923 11,105
Cost of sales, exclusive of depreciation stated separately below 3,745 2,236 9,168 6,168
Cost of service and maintenance 104 85 198 196
Selling, general and administrative expense 2,390 2,152 5,436 4,721
Depreciation and amortization 5,310 5,437 10,638 10,940
Total operating costs and expenses 15,804 15,321 34,363 33,130
Operating income 414 1,873 757 5,640
Other income (expense):        
Interest expense (2) (2) (4) (4)
Other income (expense), net 3 (7) 6 12
Total other income (expense), net 1 (9) 2 8
Income before provision for income taxes 415 1,864 759 5,648
Provision for income taxes 40 605 132 1,848
Net income $ 375 $ 1,259 $ 627 $ 3,800
Earnings per share:        
Basic (in USD per share) $ 0.03 $ 0.10 $ 0.05 $ 0.30
Diluted (in USD per share) $ 0.03 $ 0.10 $ 0.05 $ 0.29
Weighted average shares outstanding:        
Basic (in shares) 12,831 12,709 12,818 12,678
Diluted (in shares) 13,130 12,936 13,093 12,887