Note 4 - Investments

3 Months Ended

Mar. 31, 2017

Notes to Financial Statements

Cash and Cash Equivalents Disclosure [Text Block]

4.

            Investments

All of the Company’s investments are classified as available-for-sale and are carried at fair value with unrealized gains and losses recorded as a component of accumulated other comprehensive income, net of related income taxes. The Company held bank certificates of deposit of

$19.3

million and

$20.5

million at

March

31,

2017

and

December

31,

2016,

respectively. There were

no

unrealized gains or losses on the Company’s available-for-sale securities at

March

31,

2017

or

December

31,

2016.