Note 2 - Short-term Investments

3 Months Ended

Mar. 31, 2019

Notes to Financial Statements

Cash, Cash Equivalents, and Short-term Investments [Text Block]

2. Short-Term Investments

The Company’s

$2.9

 million of short-term investments at

March 31, 2019 

is comprised of

12

 fully insured certificates of deposit with original maturities ranging from

four

to

six

months and interest rates ranging from

2.25%

to

2.50%