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Note 3 - Financial Instruments Measured at Fair Value (Tables)

9 Months Ended

Sep. 30, 2017

Available-for-sale Securities [Table Text Block]

	September 30, 2017
			Gross		Gross		Estimated
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses (1)		Value
Corporate debt securities (2)	$	9,843	$	1	$	2	$	9,842
U.S. Treasury securities		4,596		-		-		4,596
Bank certificates of deposit		1,299		-		-		1,299
Foreign government security		603		-		-		603
	$	16,341	$	1	$	2	$	16,340

	December 31, 2016
			Gross		Gross		Estimated
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses (1)		Value
Corporate debt securities (2)	$	22,513	$	1	$	6	$	22,508
Government-sponsored enterprise securities		8,109		-		1		8,108
Bank certificates of deposit		750		1		-		751
Foreign government security		623		-		-		623
	$	31,995	$	2	$	7	$	31,990

Investments Classified by Contractual Maturity Date [Table Text Block]

	September 30, 2017				December 31, 2016
	Amortized		Estimated		Amortized		Estimated
	Cost		Fair Value		Cost		Fair Value
Due in one year or less	$	16,341	$	16,340	$	31,372	$	31,367
Due after one year through three years		-		-		623		623
	$	16,341	$	16,340	$	31,995	$	31,990

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

	Fair value measurements at September 30, 2017 using:
							Total estimated
	Level 1		Level 2		Level 3		fair value
Cash	$	98,678	$	-	$	-	$	98,678
U.S. Treasury securities		-		4,596		-		4,596
Corporate debt securities		-		19,329		-		19,329
Money market funds		-		13,820		-		13,820
Bank certificates of deposit		-		1,298		-		1,298
Foreign government security		-		603		-		603
	$	98,678	$	39,646	$	-	$	138,324

	Fair value measurements at December 31, 2016 using:
							Total estimated
	Level 1		Level 2		Level 3		fair value
Cash	$	70,279	$	-	$	-	$	70,279
Foreign government security		-		623		-		623
Corporate debt securities		-		24,108		-		24,108
Government-sponsored enterprise securities		-		8,108		-		8,108
Money market funds		-		24,166		-		24,166
Bank certificates of deposit		-		751		-		751
	$	70,279	$	57,756	$	-	$	128,035

- 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