Note 5 - Securities Available-for-Sale

6 Months Ended

Jun. 30, 2014

Investments, Debt and Equity Securities [Abstract]

Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]

5. Securities Available-for-Sale

Securities available-for-sale consisted of the following as of June 30, 2014 (in thousands):

	June 30, 2014
	Amortized		Unrealized				Estimated
	Cost		Gain		Loss		Fair Value
Commercial paper	$	9,498	$	—	$	—	$	9,498
U.S. government sponsored enterprise securities		2,006		—		—		2,006
Corporate debt securities		2,872		3		—		2,875
	$	14,376	$	3	$	—	$	14,379

The amortized cost and estimated fair value of the Company securities available-for-sale by contractual maturity as of June 30, 2014 are shown below (in thousands):

	June 30, 2014
	Amortized		Unrealized				Estimated
	Cost		Gain		Loss		Fair Value
Within one year	$	9,498	$	—	$	—	$	9,498
After one year		4,878		3		—		4,881
	$	14,376	$	3	$	—	$	14,379

Securities available-for-sale consisted of the following as of December 31, 2013 (in thousands):

	December 31, 2013
	Amortized		Unrealized					Estimated
	Cost		Gain		Loss			Fair Value
Commercial paper	$	9,798	$	—	$	—		$	9,798
U.S. government sponsored enterprise securities		17,007		2		(4	)		17,005
Corporate debt securities		6,506		2		(1	)		6,507
	$	33,311	$	4	$	(5	)	$	33,310

The amortized cost and estimated fair value of the Company securities available-for-sale by contractual maturity as of December 31, 2013 are shown below (in thousands):

	December 31, 2013
	Amortized		Unrealized					Estimated
	Cost		Gain		Loss			Fair Value
Within one year	$	30,430	$	2	$	(4	)	$	30,428
After one year		2,881		2		(1	)		2,882
	$	33,311	$	4	$	(5	)	$	33,310