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Condensed Balance Sheets Parentheticals (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Current Assets:    
Allowance for doubtful accounts $ 443 $ 436
Noncurrent Assets:    
Accumulated depreciation, rental equipment 91,144 86,533
Accumulated depreciation, property and equipment 10,015 9,692
Accumulated amortization, intangibles $ 2,222 $ 2,191
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 (in USD per share) $ 0.01 $ 0.01
Common stock, shares authorized 30,000,000 30,000,000
Common stock, shares issued 12,397,000 12,366,000
Common stock, shares outstanding 12,397,000 12,366,000