Note 20 - Segment Information (Details) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2015
USD ($)
|
Dec. 31, 2014
USD ($)
|
Dec. 31, 2013
USD ($)
|
|
| Note 20 - Segment Information (Details) [Line Items] | |||
| Number of Reportable Segments | 2 | ||
| Chemicals [Member] | |||
| Note 20 - Segment Information (Details) [Line Items] | |||
| Number of Reportable Segments | 2 | ||
| Biofuels [Member] | |||
| Note 20 - Segment Information (Details) [Line Items] | |||
| Revenue from Grants (in Dollars) | $ 147 | $ 420 | $ 886 |
| Sales Revenue, Goods, Net [Member] | Geographic Concentration Risk [Member] | MEXICO | |||
| Note 20 - Segment Information (Details) [Line Items] | |||
| Concentration Risk, Percentage | 0.00% | 1.00% | 3.00% |