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Valuation and Qualifying accounts
 12 Months Ended
Dec. 31, 2012
Valuation and Qualifying Accounts [Abstract]  
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
14. Valuation and Qualifying Accounts (in thousands):
 
Balance at
Beginning
of Period

 
Charged/
(Credited) to Revenues and Expenses
 
Write-Off of
Previously
Provided
Accounts
 
Balance at
End of
Period
Year Ended December 31, 2012:
 
 
 
 
 
 
 
Allowance for Doubtful Accounts
$
390

 
$
48

 
$
8

 
$
430

Allowance for Customer Returns and Sales Credits
$
1,411

 
$
4,265

 
$
5,247

 
$
429

 
 
 
 
 
 
 
 
Year Ended December 31, 2011: 
 
 
 
 
 
 
 
Allowance for Doubtful Accounts
$
361

 
$
30

 
$
1

 
$
390

Allowance for Customer Returns and Sales Credits
$
584

 
$
6,750

 
$
5,923

 
$
1,411

 
 
 
 
 
 
 
 
Year Ended December 31, 2010: 
 
 
 
 
 
 
 
Allowance for Doubtful Accounts
$
350

 
$
22

 
$
11

 
$
361

Allowance for Customer Returns and Sales Credits
$
827

 
$
5,396

 
$
5,639

 
$
584