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Schedule II
 12 Months Ended
Dec. 31, 2011
Schedule II Valuation and Qualifying Accounts [Abstract]  
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
Schedule II — Valuation and Qualifying Accounts
Allowance for Doubtful Accounts

Years Ended December 31,
 
Balance at
Beginning of
Period
 
Additions
Charged to Costs
and Expenses
 
Deductions
Write-offs and
Other Adjustments
 
Balance at
End of
Period
2011
 
$
175

 
$
401

 
$
(338
)
 
$
238

2010
 
$
307

 
$
93

 
$
(225
)
 
$
175