Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

The following table presents the Company’s financial assets and liabilities that are measured at fair value on a recurring basis which were comprised of the following types of instruments at December 31, 2016 and 2017:

	Fair Value Measurements at December 31, 2016 Using
	Level 1		Level 2		Level 3

	(in thousands)
Assets:
Cash and cash equivalents:
Time deposits with original maturities less than three months	$	13,055		-		-
Marketable securities available-for-sale:
Time deposit with original maturities more than three months		-		5,140		-
Money market fund		5,017		-		-
Restricted marketable securities:
Time deposits with original maturities of more than three months		-		324		-
Total	$	18,072		5,464		-
Liabilities:
Short-term debt	$	-		138,000		-
Total	$	-		138,000		-

	Fair Value Measurements at December 31, 2017 Using
	Level 1		Level 2		Level 3
	(in thousands)
Assets:
Cash and cash equivalents:
Time deposits with original maturities less than three months	$	22,559		-		-
Marketable securities available-for-sale:
Time deposit with original maturities more than three months		-		10,358		-
Money market fund		521		-		-
Restricted marketable securities:
Time deposits with original maturities of more than three months		-		470		-
Total	$	23,080		10,828		-

	Fair Value Measurements at December 31, 2017 Using
	Level 1		Level 2		Level 3
	(in thousands)
Liabilities:
Short-term debt	$	-		147,000		-
Total	$	-		147,000		-