Note 10 - Segment Information (Details Textual)  | 
12 Months Ended | 
|---|---|
Dec. 31, 2015  | |
| Number of Reportable Segments | 1 | 
| X | ||||||||||
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. No definition available. 
  |