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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Revenue:    
Rental income $ 17,129 $ 15,341
Revenue from contracts with customers 3,207 3,056
Total revenue 20,336 18,397
Operating costs and expenses:    
Cost of rentals, exclusive of depreciation stated separately below 9,230 7,156
Cost of sales, exclusive of depreciation stated separately below 1,988 2,616
Cost of service and maintenance, exclusive of depreciation stated separately below 173 48
Selling, general and administrative expenses 2,502 2,649
Depreciation and amortization 6,061 6,297
Total operating costs and expenses 19,954 18,766
Operating income (loss) 382 (369)
Other income (expense):    
Interest expense (24) (1)
Other income (expense), net (32) 101
Total other income (expense), net (56) 100
Income (loss) before provision for income taxes 326 (269)
Income tax benefit (expense) 11 (125)
Net income (loss) $ 337 $ (394)
Earnings (loss) per share:    
Basic (in dollars per share) $ 0.03 $ (0.03)
Diluted (in dollars per share) $ 0.03 $ (0.03)
Weighted average shares outstanding:    
Basic (in shares) 12,537 13,263
Diluted (in shares) 12,698 13,263
Sales    
Revenue:    
Revenue from contracts with customers $ 2,893 $ 2,711
Service and maintenance income    
Revenue:    
Revenue from contracts with customers $ 314 $ 345