Note 15 - Common Stock Authorized (Details Textual) - $ / shares	May 09, 2017	Jun. 30, 2017	May 08, 2017	Dec. 31, 2016
Common Stock, Increase, Shares Authorized	15,000,000
Common Stock, Shares Authorized	45,000,000	45,000,000	30,000,000	30,000,000
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01		$ 0.01