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Condensed Consolidated Income Statements (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenue:        
Revenue $ 18,204 $ 16,218 $ 32,922 $ 35,120
Operating costs and expenses:        
Cost of rentals, exclusive of depreciation stated separately below 5,195 4,255 9,899 8,923
Cost of sales, exclusive of depreciation stated separately below 4,924 3,745 7,115 9,168
Cost of service and maintenance 101 104 166 198
Selling, general and administrative expense 2,309 2,390 4,330 5,436
Depreciation and amortization 5,449 5,310 10,836 10,638
Total operating costs and expenses 17,978 15,804 32,346 34,363
Operating income 226 414 576 757
Other income (expense):        
Interest expense (3) (2) (6) (4)
Other income, net 78 3 5 6
Total other income (expense), net 75 1 (1) 2
Income before provision for income taxes 301 415 575 759
Provision for income taxes 54 40 103 132
Net income $ 247 $ 375 $ 472 $ 627
Earnings per share:        
Basic (in USD per share) $ 0.02 $ 0.03 $ 0.04 $ 0.05
Diluted (in USD per share) $ 0.02 $ 0.03 $ 0.04 $ 0.05
Weighted average shares outstanding:        
Basic (in shares) 12,963 12,831 12,941 12,818
Diluted (in shares) 13,261 13,130 13,215 13,093
Rental        
Revenue:        
Revenue $ 11,427 $ 11,420 $ 22,898 $ 23,342
Operating costs and expenses:        
Total operating costs and expenses 5,195 4,255 9,899 8,923
Other income (expense):        
Total other income (expense), net 0 0 0 0
Income before provision for income taxes 6,232 7,165 12,999 14,419
Sales        
Revenue:        
Revenue 6,383 4,407 9,381 11,044
Service and maintenance        
Revenue:        
Revenue 394 391 643 734
Operating costs and expenses:        
Total operating costs and expenses 101 104 166 198
Other income (expense):        
Total other income (expense), net 0 0 0 0
Income before provision for income taxes $ 293 $ 287 $ 477 $ 536