Note 9 - Amendment to Amended and Restated Certificate of Incorporation (Details Textual) - $ / shares	Dec. 31, 2016	Dec. 31, 2015	May 31, 2015	Apr. 30, 2015
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01		$ 0.01
Common Stock, Shares Authorized	96,000,000	96,000,000	96,000,000	48,000,000