Note 2 - Cash, Cash Equivalents and Marketable Investments (Tables)

6 Months Ended

Jun. 30, 2014

Disclosure Text Block Supplement [Abstract]

Unrealized Gain (Loss) on Investments [Table Text Block]

June 30, 2014	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
Cash and cash equivalents:
Cash	$	5,154	$	—	$	—		$	5,154
Money market funds		2,749		—		—			2,749
Commercial paper		2,999		—		—			2,999
Total cash and cash equivalents		10,902		—		—			10,902
Marketable investments:
U.S. government notes		17,109		28		—			17,137
U.S. government agencies		21,040		39		—			21,079
Municipal securities		3,830		5		(3	)		3,832
Commercial paper		9,834		4		—			9,838
Corporate debt securities		18,755		56		(1	)		18,810
Total marketable investments		70,568		132		(4	)		70,696
Total cash, cash equivalents and marketable investments	$	81,470	$	132	$	(4	)	$	81,598

December 31, 2013	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
Cash and cash equivalents:
Cash	$	3,816	$	—	$	—		$	3,816
Money market funds		9,926		—		—			9,926
Commercial paper		2,500		—		—			2,500
Total cash and cash equivalents		16,242		—		—			16,242
Marketable investments:
U.S. government notes		10,516		11		(5	)		10,522
U.S. government agencies		25,823		38		(3	)		25,858
Municipal securities		2,043		1		(5	)		2,039
Commercial paper		10,239		3		—			10,242
Corporate debt securities		18,109		61		—			18,170
Total marketable investments		66,730		114		(13	)		66,831
Total cash, cash equivalents and marketable investments	$	82,972	$	114	$	(13	)	$	83,073

Investments Classified by Contractual Maturity Date [Table Text Block]

	Amount
Due in less than one year	$	33,828
Due in 1 to 3 years		36,868
	$	70,696