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Condensed Balance Sheets Parentheticals (USD $)
In Thousands, except Per Share data, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Current Assets:    
Allowance for doubtful accounts $ 434 $ 296
Allowance for inventory obsolescence 816 486
Assets, Noncurrent [Abstract]    
Accumulated depreciation, rental equipment 66,543 56,623
Accumulated depreciation, property and equipment 8,597 7,786
Accumulated amortization, goodwill 325 325
Accumulated amortization, intangibles $ 2,030 $ 1,936
Stockholders' Equity Attributable to Parent [Abstract]    
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 12,237 12,179
Common stock, shares outstanding 12,237 12,179