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Condensed Consolidated Income Statements - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Revenue:        
Revenue $ 19,895 $ 18,204 $ 37,886 $ 32,922
Operating costs and expenses:        
Cost of rentals, exclusive of depreciation stated separately below 6,359 5,195 12,244 9,899
Cost of sales, exclusive of depreciation stated separately below 4,419 4,924 8,118 7,115
Cost of service and maintenance 159 101 306 166
Selling, general and administrative expense 2,682 2,309 5,175 4,330
Depreciation and amortization 5,683 5,449 11,241 10,836
Total operating costs and expenses 19,302 17,978 37,084 32,346
Operating income 593 226 802 576
Other income (expense):        
Interest expense (4) (3) (8) (6)
Other income, net 181 78 486 5
Total other income (expense), net 177 75 478 (1)
Income before provision for income taxes 770 301 1,280 575
Income tax expense 197 54 350 103
Net income $ 573 $ 247 $ 930 $ 472
Earnings per share:        
Basic (in USD per share) $ 0.04 $ 0.02 $ 0.07 $ 0.04
Diluted (in USD per share) $ 0.04 $ 0.02 $ 0.07 $ 0.04
Weighted average shares outstanding:        
Basic (in shares) 13,134 12,963 13,100 12,941
Diluted (in shares) 13,462 13,261 13,368 13,215
Rental        
Revenue:        
Revenue $ 13,572 $ 11,427 $ 26,959 $ 22,898
Operating costs and expenses:        
Total operating costs and expenses 6,359 5,195 12,244 9,899
Other income (expense):        
Total other income (expense), net 0 0 0 0
Income before provision for income taxes 7,213 6,232 14,715 12,999
Sales        
Revenue:        
Revenue 5,814 6,383 9,939 9,381
Service and maintenance        
Revenue:        
Revenue 509 394 988 643
Operating costs and expenses:        
Total operating costs and expenses 159 101 306 166
Other income (expense):        
Total other income (expense), net 0 0 0 0
Income before provision for income taxes $ 350 $ 293 $ 682 $ 477