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Condensed Balance Sheets Parentheticals (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Current Assets:    
Allowance for doubtful accounts $ 462,000 $ 296,000
Allowance for inventory obsolescence 770,808 485,680
Assets, Noncurrent [Abstract]    
Accumulated depreciation, rental equipment 62,967,000 56,623,000
Accumulated depreciation, property and equipment 8,463,000 7,786,000
Accumulated amortization, goodwill 325,000 325,000
Accumulated amortization, intangibles $ 1,967,000 $ 1,936,000
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 12,218 12,179
Common stock, shares outstanding 12,218 12,179