Note 2 - Investments

6 Months Ended

Jun. 30, 2017

Notes to Financial Statements

Investments and Restricted Cash Disclosure [Text Block]

Note 2. Investments

Our current investments, which are classified as "available for sale" and consist of bonds having maturities of greater than

90

days, had a fair value and cost basis of

$37.8

million and

$29.1

million, respectively, at

June 

30,

2017

and

December 

31,

2016.

During the

first

six

months of

2017,

we had purchases of such investments of

$23.3

million and maturities of

$14.4

million. Our current investments at

June 

30,

2017

and

December 

31,

2016

consisted of the following (in thousands):

	June 30, 2017							December 31, 2016
	Amortized cost		Unrealized loss			Fair value		Amortized cost		Unrealized loss			Fair value
Corporate bonds	$	34,533	$	(33	)	$	34,500	$	22,100	$	(46	)	$	22,054
Municipal bonds		1,715		—			1,715		3,727		(1	)		3,726
Agency bonds		1,601		—			1,601		3,339		(2	)		3,337
Total	$	37,849	$	(33	)	$	37,816	$	29,166	$	(49	)	$	29,117

At

June 

30,

2017

and

December 

31,

2016,

the fair value of our non-current investments was

$4.7

million and

$5.0

million, respectively.  Our non-current investments consist of marketable equity securities which are carried at fair value, and are primarily classified as “available-for-sale.”  The cost basis of our non-current investments was approximately

$4.0

million at

June 

30,

2017

and

December 

31,

2016.