Note 14 - Provision for Income Taxes (Details) - USD ($) $ in Thousands |
12 Months Ended | 36 Months Ended | 48 Months Ended | ||
|---|---|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
Dec. 31, 2012 |
Dec. 31, 2013 |
|
| Note 14 - Provision for Income Taxes (Details) [Line Items] | |||||
| Income Tax Expense (Benefit) | $ 5,448 | $ 14,145 | $ 23,317 | ||
| Unrecognized Tax Benefits | 4,588 | 2,981 | 1,718 | $ 0 | $ 1,718 |
| Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | $ 61 | $ 46 | |||
| Biodiesel Blenders Credit [Member] | |||||
| Note 14 - Provision for Income Taxes (Details) [Line Items] | |||||
| Income Tax Expense (Benefit) | $ (3,878) | $ (7,755) | $ (11,633) | ||
| Domestic Tax Authority [Member] | Earliest Tax Year [Member] | |||||
| Note 14 - Provision for Income Taxes (Details) [Line Items] | |||||
| Open Tax Year | 2012 | ||||
| State and Local Jurisdiction [Member] | Earliest Tax Year [Member] | |||||
| Note 14 - Provision for Income Taxes (Details) [Line Items] | |||||
| Open Tax Year | 2012 | ||||