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Condensed Consolidated Income Statements - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Revenue:    
Revenue $ 17,991 $ 14,718
Operating costs and expenses:    
Cost of rentals, exclusive of depreciation stated separately below 5,885 4,704
Cost of sales, exclusive of depreciation stated separately below 3,699 2,191
Cost of service and maintenance 147 65
Selling, general and administrative expense 2,493 2,021
Depreciation and amortization 5,558 5,387
Total operating costs and expenses 17,782 14,368
Operating income 209 350
Other income (expense):    
Interest expense (4) (3)
Other income (expense), net 305 (73)
Total other income (expense), net 301 (76)
Income before provision for income taxes 510 274
Income tax expense 153 49
Net income $ 357 $ 225
Earnings per share:    
Basic (in USD per share) $ 0.03 $ 0.02
Diluted (in USD per share) $ 0.03 $ 0.02
Weighted average shares outstanding:    
Basic (in shares) 13,064 12,920
Diluted (in shares) 13,268 13,169
Rental    
Revenue:    
Revenue $ 13,387 $ 11,471
Operating costs and expenses:    
Total operating costs and expenses 5,885 4,704
Other income (expense):    
Total other income (expense), net 0 0
Income before provision for income taxes 7,502 6,767
Sales    
Revenue:    
Revenue 4,125 2,998
Service and maintenance    
Revenue:    
Revenue 479 249
Operating costs and expenses:    
Total operating costs and expenses 147 65
Other income (expense):    
Total other income (expense), net 0 0
Income before provision for income taxes $ 332 $ 184