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Note 3 - Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2015

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

	As of March 31, 2015
	Quoted Prices in Active Markets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Financial assets
Cash equivalents	$	9,778	$	-	$	-	$	9,778
Government securities		64,452		-		-		64,452
Corporate bonds		-		5,289		-		5,289
Total	$	74,230	$	5,289	$	-	$	79,519

	As of December 31, 2014
	Quoted Prices in Active Markets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Financial assets
Cash equivalents	$	68,830	$	-	$	-	$	68,830
Government securities		6,508		-		-		6,508
Corporate bonds				8,247		-		8,247
Total	$	75,338	$	8,247	$	-	$	83,585

Available-for-sale Securities [Table Text Block]

	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
March 31, 2015
Government securities
(Due within 1 year)	$	64,452	$	4	$	(4	)	$	64,452
Corporate bonds
(Due within 1 year)		5,289		1		(1	)		5,289
	$	69,741	$	5	$	(5	)	$	69,741

December 31, 2014
Government securities
(Due within 1 year)	$	6,510	$	-	$	(2	)	$	6,508
Corporate bonds
(Due within 1 year)		8,251		-		(4	)		8,247
	$	14,761	$	-	$	(6	)	$	14,755

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References+ Details