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Condensed Balance Sheets Balance Sheet Parentheticals (USD $)
In Thousands, except Per Share data, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Allowance for Doubtful Accounts Receivable, Current $ 247 $ 171
Inventory Valuation Reserves 833 250
Accumulated Depreciation Rental Equipment 53,312 44,245
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment 8,265 7,899
Goodwill, Accumulated Amortization 325 325
Intangible Assets, Accumulated Amortization $ 1,891 $ 1,757
Preferred Stock, Shares Authorized 5,000 5,000
Preferred Stock, Shares Issued 0 0
Preferred Stock, Shares Outstanding 0 0
Common Stock, Par or Stated Value Per Share $ 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