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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Revenue:    
Revenues $ 72,420 $ 68,055
Operating costs and expenses:    
Cost of rentals, exclusive of depreciation stated separately below 36,638 28,506
Cost of sales, exclusive of depreciation stated separately below 7,829 6,211
Cost of service and maintenance, exclusive of depreciation stated separately below 898 714
Selling, general and administrative expenses 10,762 10,550
Depreciation and amortization 25,397 25,198
Inventory allowance 208 184
Retirement of rental equipment 3,096 291
Total operating costs and expenses 84,828 71,654
Operating loss (12,408) (3,599)
Other income (expense):    
Interest expense (65) (14)
Other income 687 629
Total other income, net 622 615
Loss before income taxes: (11,786) (2,984)
(Provision for) benefit from income taxes:    
Current 1 15,438
Deferred 2,602 (10,646)
Total income tax benefit 2,603 4,792
Net income (loss) $ (9,183) $ 1,808
Earnings (loss) per share:    
Basic (in dollars per share) $ (0.70) $ 0.14
Diluted (in dollars per share) $ (0.70) $ 0.14
Weighted average shares outstanding:    
Basic (in shares) 13,100 13,224
Diluted (in shares) 13,100 13,261
Rental income    
Revenue:    
Revenues $ 63,624 $ 60,826
Sales    
Revenue:    
Revenues 6,882 5,657
Service and maintenance income    
Revenue:    
Revenues $ 1,914 $ 1,572