Valuation and Qualifying accounts

12 Months Ended

Dec. 31, 2014

Valuation and Qualifying Accounts [Abstract]

Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]

16. 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, 2015:
Allowance for Doubtful Accounts	$	57	$	(19	)	$	7	$	31
Allowance for Customer Returns and Sales Credits	$	401	$	3,442		$	3,353	$	490
Year Ended December 31, 2014:
Allowance for Doubtful Accounts	$	353	$	(46	)	$	250	$	57
Allowance for Customer Returns and Sales Credits	$	530	$	3,729		$	3,858	$	401
Year Ended December 31, 2013:
Allowance for Doubtful Accounts	$	430	$	55		$	132	$	353
Allowance for Customer Returns and Sales Credits	$	429	$	5,375		$	5,274	$	530