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Condensed Consolidated Income Statements - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Revenue:    
Rental income $ 11,922 $ 16,408
Sales 6,637 4,910
Service and maintenance income 343 258
Total revenue 18,902 21,576
Operating costs and expenses:    
Cost of rentals, exclusive of depreciation stated separately below 4,668 5,694
Cost of sales, exclusive of depreciation stated separately below 5,423 3,932
Cost of service and maintenance 94 111
Selling, general and administrative expense 3,046 2,569
Depreciation and amortization 5,328 5,503
Total operating costs and expenses 18,559 17,809
Operating income 343 3,767
Other income (expense):    
Interest expense (2) (2)
Other income 3 19
Total other income, net 1 17
Income before provision for income taxes 344 3,784
Provision for income taxes 92 1,243
Net income $ 252 $ 2,541
Earnings per share:    
Basic (in USD per share) $ 0.02 $ 0.20
Diluted (in USD per share) $ 0.02 $ 0.20
Weighted average shares outstanding:    
Basic (in shares) 12,804 12,648
Diluted (in shares) 13,056 12,838