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Note 3 - Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2015

Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]

March 31, 2015	Level 1		Level 2		Level 3		Total
Cash equivalents:
Money market funds	$	3,759	$	—	$	—	$	3,759
Commercial paper		—		3,150		—		3,150
Marketable investments:
Available-for-sale securities		—		62,595		—		62,595
Total assets at fair value	$	3,759	$	65,745	$	—	$	69,504

December 31, 2014	Level 1		Level 2		Level 3		Total
Cash equivalents:
Money market funds	$	242	$	—	$	—	$	242
Commercial paper		—		1,800		—		1,800
Marketable investments:
Available-for-sale securities		—		71,343		—		71,343
Total assets at fair value	$	242	$	73,143	$	—	$	73,385

- Definition

Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances.

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