Note 6 - Preferred Stock (Details Textual) |
Mar. 18, 2009
$ / shares
shares
|
Sep. 30, 2017
$ / shares
|
Dec. 31, 2016
$ / shares
|
---|---|---|---|
Preferred Stock Dividends Number of Preferred Share Purchase Rights Distributed for each Share of Common Stock Outstanding | 1 | ||
Common Stock, Par or Stated Value Per Share | $ 0.01 | $ 0.01 | $ 0.01 |
Preferred Stock, Par or Stated Value Per Share | $ 0.01 | $ 0.01 | |
Preferred Share Purchase Right [Member] | |||
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 25 | ||
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right | shares | 0.001 | ||
Series A Junior Participating Preferred Stock [Member] | |||
Preferred Stock, Par or Stated Value Per Share | $ 0.01 |