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Consolidated Income Statements - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Revenue:    
Rental income $ 16,408 $ 20,603
Sales, net 4,910 3,912
Service and maintenance income 258 226
Total revenue 21,576 24,741
Operating costs and expenses:    
Cost of rentals, exclusive of depreciation stated separately below 5,694 7,727
Cost of sales, exclusive of depreciation stated separately below 3,932 2,813
Cost of service and maintenance 111 38
Selling, general, and administrative expense 2,569 2,588
Depreciation and amortization 5,503 5,788
Total operating costs and expenses 17,809 18,954
Operating income 3,767 5,787
Other income (expense):    
Interest expense (2) (3)
Other income 19 42
Total other income, net 17 39
Income before provision for income taxes 3,784 5,826
Provision for income taxes 1,243 2,132
Net income $ 2,541 $ 3,694
Earnings per share:    
Basic (in USD per share) $ 0.20 $ 0.30
Diluted (in USD per share) $ 0.20 $ 0.29
Weighted average shares outstanding:    
Basic (in shares) 12,648 12,504
Diluted (in shares) 12,838 12,713