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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Current Assets:    
Allowance for doubtful accounts $ 569 $ 597
Allowance for inventory obsolescence 15 15
Assets, Noncurrent [Abstract]    
Accumulated depreciation, rental equipment 145,851 126,069
Accumulated depreciation, property and equipment 11,274 11,267
Accumulated amortization, intangibles $ 1,632 $ 1,508
Stockholders' Equity Attributable to Parent [Abstract]    
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 $ 0.01 $ 0.01
Common stock, shares authorized 30,000,000 30,000,000
Common stock, shares issued 12,880,000 12,764,000
Common stock, shares outstanding 12,880,000 12,764,000