Note 15 - Reverse Stock Split

12 Months Ended

Dec. 31, 2018

Notes to Financial Statements

Stockholders' Equity, Reverse Stock Split [Text Block]

15.

 Reverse Stock Split

On

June 19, 2019,

the Company’s Board of Directors approved an amendment to the Company’s amended and restated certificate of incorporation to effect a

1

-for-

10

reverse stock split of the Company’s common stock. The reverse stock split became effective on

June 21, 2019.

The par value of the common stock and convertible preferred stock was

not

adjusted as a result of the reverse stock split. All common stock, stock options, and restricted stock units, and per share amounts in the financial statements as of and for the years ended

December 31, 2018

and

2017

have been retroactively adjusted to give effect to the reverse stock split.