Note 12 - Subsequent Event

3 Months Ended

12 Months Ended

Mar. 31, 2017

Dec. 31, 2016

Notes to Financial Statements

Subsequent Events [Text Block]

11.

        Subsequent Events

During

April 2017,

we issued an aggregate of

2,500,000

shares of common stock related to the exercise of stock purchase warrants, resulting in total net proceeds of

$100,000.

During

May 2017,

we sold

1,000

shares of our Series D convertible preferred stock to certain institutional investors for an aggregate purchase price of

$1,000,000.

Each share of preferred stock is initially convertible into approximately

66,666.67

shares of our common stock for an aggregate total of

66,666,667

shares of our common stock.

12

.          

Subsequent Event

During

March 2017,

we issued

983,334

shares of our common stock pursuant to the exercise of certain stock purchase warrants, resulting in total net proceeds of

$49,167.