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Condensed Balance Sheets Parenthetical (USD $)
In Thousands, except Per Share data
Sep. 30, 2011
Dec. 31, 2010
Current Assets:  
Allowance for doubtful accounts$ 247$ 171
Allowance for inventory obsolescence833250
Noncurrent Assets:  
Accumulated depreciation, rental equipment53,31244,245
Accumulated depreciation, property and equipment8,2657,899
Accumulated amortization, goodwill325325
Accumulated amortization, intangibles$ 1,891$ 1,757
Stockholders' Equity:  
Preferred stock, shares authorized5,0005,000
Preferred stock, shares issued00
Preferred stock, shares outstanding00
Common stock, par value$ 0.01$ 0.01
Common stock, shares authorized30,00030,000
Common stock, shares issued12,17912,148
Common stock, shares outstanding12,17912,148