Note 9 - Reverse Stock Split (Details Textual)	Jul. 23, 2015 $ / shares shares	Jun. 30, 2016 $ / shares shares	Dec. 31, 2015 $ / shares shares
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	15
Common Stock, Shares Authorized	200,000,000	200,000,000	200,000,000
Common Stock, Par or Stated Value Per Share | $ / shares	$ 0.001	$ 0.001	$ 0.001
Preferred Stock, Shares Authorized	10,000,000	10,000,000	10,000,000
Preferred Stock, Par or Stated Value Per Share | $ / shares	$ 0.01	$ 0.01	$ 0.01
Stock Issued During Period, Shares, Reverse Stock Splits	1,117