Note 2 - Investments

6 Months Ended

Jun. 30, 2018

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

$5.6

million and

$33.8

million, respectively, at

June 

30,

2018

and

December 

31,

2017.

During the

first

six

months of

2018

and

2017,

we had purchases of such investments of

$31.2

million and

$23.3

million, respectively, and maturities of

$59.3

million and

$14.4

million, respectively. Our current investments at

June 

30,

2018

and

December 

31,

2017

consisted of the following (in thousands):

	June 30, 2018							December 31, 2017
	Amortized cost		Unrealized loss			Fair value		Amortized cost		Unrealized loss			Fair value
Corporate bonds	$	5,559	$	(3	)	$	5,556	$	33,778	$	(20	)	$	33,758

At

June 

30,

2018

and

December 

31,

2017,

the fair value of our non-current investments was

$7.4

million and

$7.6

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

$6.0

million and

$5.7

million at

June 

30,

2018

and

December 

31,

2017,

respectively. During the

six

months ended

June 

30,

2018,

we recognized

$0.3

million in net unrealized losses in current earnings. During the

six

months ended

June 

30,

2017,

we recognized

$0.6

million in net unrealized gains on equity investments in other comprehensive income and

$0.1

million in net unrealized gains in current earnings.