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Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Current Assets:    
Allowance for doubtful accounts $ 495 $ 569
Allowance for inventory obsolescence 21 15
Noncurrent Assets:    
Accumulated depreciation, rental equipment 150,859 145,851
Accumulated depreciation, property and equipment 11,528 11,274
Accumulated amortization, intangibles $ 1,664 $ 1,632
Stockholders’ Equity:    
Preferred stock, shares authorized 5,000,000 5,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value (in USD per share) $ 0.01 $ 0.01
Common stock, shares authorized 30,000,000 30,000,000
Common stock, shares issued 12,949,000 12,880,000
Common stock, shares outstanding 12,949,000 12,880,000