Note 3 - Marketable Securities

9 Months Ended

Sep. 30, 2019

Notes to Financial Statements

Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]

3. Marketable Securities

All investments with original maturities of more than

90

days are considered marketable securities. As of

December 31, 2018,

the Company had

one

held-to-maturity security (a CD with Bank of America in Brazil) with a maturity of

180

days, which matured

April 29, 2019.

The CD had an original cost and current fair value of BRL

15

million (USD

$4.0

million). As of

September 30, 2019,

the Company had

no

marketable securities.