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Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Current Assets:    
Allowance for doubtful accounts $ 437 $ 296
Allowance for inventory obsolescence 211 486
Assets, Noncurrent [Abstract]    
Accumulated depreciation, rental equipment 70,266 56,623
Less accumulated depreciation 8,441 7,785
Accumulated amortization, goodwill 325 325
Accumulated amortization, intangibles $ 2,060 $ 1,936
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 $ 0.01 $ 0.01
Common stock, shares authorized 30,000,000 30,000,000
Common stock, shares issued 12,241,000 12,179,000
Common stock, shares outstanding 12,241,000 12,179,000