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Note 3 - Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2017

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

	As of June 30, 2017
	Quoted Prices in Active Markets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets
Cash equivalents	$	6,019	$	-	$	-	$	6,019
Government securities		13,357		-		-		13,357
Total	$	19,376	$	-	$	-	$	19,376

	As of December 31, 2016
	Quoted Prices in Active Markets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets
Cash equivalents	$	28,876	$	-	$	-	$	28,876
Government securities		4,925		-		-		4,925
Total	$	33,801	$	-	$	-	$	33,801

Available-for-sale Securities [Table Text Block]

	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
June 30, 2017
Government securities
(Due within 1 year)	$	13,363	$	-	$	(6	)	$	13,357
	$	13,363	$	-	$	(6	)	$	13,357

December 31, 2016
Government securities
(Due within 1 year)	$	4,924	$	1	$	-		$	4,925
	$	4,924	$	1	$	-		$	4,925

- 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