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Condensed Balance Sheets Parentheticals (USD $)
In Thousands, except Share data, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Current Assets:    
Allowance for doubtful accounts $ 401 $ 437
Noncurrent Assets:    
Accumulated depreciation, rental equipment 82,259 70,266
Accumulated depreciation, property and equipment 9,250 8,441
Accumulated amortization, intangibles $ 2,159 $ 2,060
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 12,352,000 12,241,000
Common stock, shares outstanding 12,352,000 12,241,000