Note 2 - Investments

3 Months Ended

Mar. 31, 2018

Notes to Financial Statements

Investments and Restricted Cash Disclosure [Text Block]

Note

2.

    Investments

Investments

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

90

days and less than

365

days, had a fair value of

$34.4

million and

$33.8

million, respectively, at

March 

31,

2018

and

December 

31,

2017.

During the

first

quarter of

2018

and

2017,

we had purchases of such investments of

$31.2

million and

$11.1

million, respectively, and maturities of

$30.5

million and

$3.6

million, respectively. Our current investments at

March 

31,

2018

and

December 

31,

2017

consisted of the following:

	March 31, 2018							December 31, 2017
	Amortized cost		Unrealized loss			Fair market value		Amortized cost		Unrealized loss			Fair market value
Corporate bonds	$	34,394	$	(36	)	$	34,358	$	33,778	$	(20	)	$	33,758

At

March 

31,

2018

and

December 

31,

2017,

the fair value of our non-current investments was

$7.7

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

$5.6

million and

$5.7

million at

March 

31,

2018

and

December 

31,

2017,

respectively. We had net unrealized gains of

$2.1

million and

$1.9

million on equity investments held as of

March 

31,

2018

and

December 

31,

2017,

respectively. During the quarter ended

March 

31,

2018,

we recognized

$0.3

million in net unrealized gains in current earnings. During the quarter ended

March 31, 2017,

we recognized

$0.3

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

$0.3

million in net unrealized gains in current earnings.