Note 11 - Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2015

Disclosure Text Block [Abstract]

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

	Balance as of			Fair Value Measurements
	September 30, 2015			Level 1		Level 2			Level 3
Description
Assets:
Cash equivalents:
Money market mutual funds	$	2,302		$	2,302		-			-
Short-term marketable securities and cash deposits:
U.S. GSE securities	$	1,509			-	$	1,509			-
Corporate debt securities	$	13,610			-	$	13,610			-
Long-term marketable securities:
U.S. GSE securities	$	22,124			-	$	22,124			-
Corporate debt securities	$	64,138			-	$	64,138			-
Derivative liabilities	$	(75	)		-	$	(75	)		-

	Balance as of			Fair Value Measurements
	December 31, 2014			Level 1		Level 2			Level 3
Description
Assets:
Cash equivalents:
Money market mutual funds	$	2,746		$	2,746		-			-
Short-term marketable securities and time deposits:
U.S. GSE securities	$	1,499			-	$	1,499			-
Corporate debt securities	$	7,410			-	$	7,410			-
Long-term marketable securities:
U.S. GSE securities	$	19,552			-	$	19,552			-
Corporate debt securities	$	72,717			-	$	72,717			-
Derivative liabilities	$	(618	)		-	$	(618	)		-