Note 12 - Related Party Transactions

12 Months Ended

Dec. 31, 2016

Notes to Financial Statements

Related Party Transactions Disclosure [Text Block]

12. Related Party Transactions

At

December

31,

2016

certain of our cash and short-term investments were held and managed by BlackRock, Inc. which owns

11.5%

of our outstanding common stock as reported in its Form

13

-G filing made with the Securities and Exchange Commission on

January

12,

2017.