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Condensed Balance Sheets Parenthetical (USD $)
In Thousands, except Per Share data
Jun. 30, 2011
Dec. 31, 2010
Current Assets:    
Allowance for doubtful accounts $ 212 $ 171
Allowance for inventory obsolescence 785 250
Noncurrent Assets:    
Accumulated depreciation, rental equipment 50,135 44,245
Accumulated depreciation, property and equipment 7,941 7,899
Accumulated amortization, goodwill 325 325
Accumulated amortization, intangibles $ 1,846 $ 1,757
Stockholders' Equity:    
Preferred stock, shares authorized 5,000 5,000
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 30,000
Common stock, shares issued 12,179 12,148
Common stock, shares outstanding 12,179 12,148