Note 11 - Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2016

Disclosure Text Block [Abstract]

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

	Balance as of		Fair Value Measurements
	March 31, 2016		Level 1		Level 2		Level 3
Description
Assets:
Cash equivalents:
Money market mutual funds	$	1,444	$	1,444		-		-
Short-term marketable securities and cash deposits:
U.S. GSE securities	$	375		-	$	375		-
Corporate debt securities	$	12,979		-	$	12,979		-
Long-term marketable securities:
U.S. GSE securities	$	22,152		-	$	22,152		-
Corporate debt securities	$	63,750		-	$	63,750		-
Derivative Assets	$	162		-	$	162		-

	Balance as of			Fair Value Measurements
	December 31, 2015			Level 1		Level 2			Level 3
Description
Assets:
Cash equivalents:
Money market mutual funds	$	1,089		$	1,089		-			-
Short-term marketable securities and time deposits:
U.S. GSE securities
Corporate debt securities	$	12,501			-	$	12,501			-
Long-term marketable securities:
U.S. GSE securities	$	23,531			-	$	23,531			-
Corporate debt securities	$	66,184			-	$	66,184			-
Derivative liabilities	$	(36	)		-	$	(36	)		-