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Note 3 - Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2017

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

	As of March 31, 2017
	Quoted Prices in Active Markets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets
Cash equivalents	$	21,507	$	-	$	-	$	21,507
Government securities		-		-		-		-
Total	$	21,507	$	-	$	-	$	21,507

	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
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