Note 4 - Investments

6 Months Ended

Jun. 30, 2017

Notes to Financial Statements

Investment [Text Block]

( 4 )  Investments

The following table summarizes the estimated value of the Company’s cash equivalents and marketable securities and the gross unrealized gains and losses as of

June 30, 2017 (

in thousands):

	Amortized cost		Unrealized gain		Unrealized loss		Estimated Fair Value
US government securities	$	1,796	$	—	$	—	$	1,796
Total marketable securities	$	1,796	$	—	$	—	$	1,796

As of

June 30, 2017,

the contractual maturity of the available-for-sale marketable securities is less than

one

year. There was

no

other-than-temporary impairment recognized during the

6 months ended

June 30, 2017.