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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Current Assets:    
Allowance for doubtful accounts $ 291 $ 569
Allowance for inventory obsolescence 19 15
Assets, Noncurrent [Abstract]    
Accumulated depreciation, rental equipment 165,428 145,851
Accumulated depreciation, property and equipment 11,556 11,274
Accumulated amortization, intangibles $ 1,758 $ 1,632
Stockholders' Equity Attributable to Parent [Abstract]    
Preferred stock, shares authorized (in shares) 5,000,000 5,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 30,000,000 30,000,000
Common stock, shares issued (in shares) 13,005,000 12,880,000
Common stock, shares outstanding (in shares) 13,005,000 12,880,000