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Schedule II - Valuation and Qualifying Accounts (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Accounts receivable allowance for doubtful accounts [Member]
      
Valuation and Qualifying Accounts      
Balance at Beginning of year $ 636 $ 676 $ 729
Additions-Charges to Costs and Expenses 347 145 90
Deductions-Write-offs/Costs Incurred 28 185 143
Balance at End of year 955 636 676
Inventory-reserve for slow-moving items [Member]
      
Valuation and Qualifying Accounts      
Balance at Beginning of year 1,616 1,198 514
Additions-Charges to Costs and Expenses 751 485 745
Deductions-Write-offs/Costs Incurred 600 67 61
Balance at End of year 1,767 1,616 1,198
Notes receivable allowance for doubtful accounts [Member]
      
Valuation and Qualifying Accounts      
Balance at Beginning of year 970 970 970
Additions-Charges to Costs and Expenses 0 0 0
Deductions-Write-offs/Costs Incurred 0 0 0
Balance at End of year 970 970 970
Deferred tax assets valuation allowance [Member]
      
Valuation and Qualifying Accounts      
Balance at Beginning of year 310 358 268
Additions-Charges to Costs and Expenses 34 0 90
Deductions-Write-offs/Costs Incurred 0 48 0
Balance at End of year $ 344 $ 310 $ 358