Note 1 - Significant Accounting Policies Summary of Operations and Basis of Presentation (Details) (USD $)
 1 Months Ended 4 Months Ended 8 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Jun. 30, 2013
Apr. 30, 2011
Oct. 30, 2010
Sep. 30, 2010
Dec. 31, 2010
Apr. 30, 2011
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Reclassification of Cash Flows From Investing Activities to Operating Activities Related to Accrued Capital Expenditures [Member]
Dec. 31, 2011
Reclassification of Cash Flows From Investing Activities to Operating Activities Related to Accrued Capital Expenditures [Member]
Dec. 31, 2013
Animal Nutrition [Member]
Dec. 31, 2013
Human Nutrition [Member]
Dec. 31, 2013
Unallocated Inventory and Net Change with Current Period Swap Transaction [Member]
Dec. 31, 2013
Replacements and Major Improvements [Member]
Minimum [Member]
Dec. 31, 2013
Replacements and Major Improvements [Member]
Maximum [Member]
Dec. 31, 2013
Energy Swap [Member]
Dec. 31, 2012
Energy Swap [Member]
Dec. 31, 2013
Ineffective Portion of Diesel Energy Swaps [Member]
Dec. 31, 2012
Ineffective Portion of Diesel Energy Swaps [Member]
Dec. 31, 2011
Oil Spill [Member]
Dec. 31, 2010
Oil Spill [Member]
Note 1 - Significant Accounting Policies Summary of Operations and Basis of Presentation (Details) [Line Items]                                            
Number of Operating Segments             2                              
Number of Subsidiaries                       2 3                  
Prior Period Reclassification Adjustment                   $ 200,000 $ 500,000                      
Proceeds from Legal Settlements     11,400,000 7,300,000 18,700,000 44,800,000                                
Costs Of Goods And Services Sold, Percentage                 4.40%                       4.40% 8.90%
Reduction in Cost of Sales                                         8,200,000 10,500,000
Loss from Catastrophes   (26,200,000)                                        
Shipping, Handling and Transportation Costs             9,400,000 14,400,000 16,500,000                          
Proceeds from Insurance Settlement, Operating Activities 3,100,000             300,000                            
Derivative Asset, Current             275,000 134,000                 300,000 100,000        
Deferred Tax Liabilities, Derivatives             96,100 15,100                 100,000 15,100        
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax             179,000 28,000 (420,000)         200,000                
Accumulated Other Comprehensive Income Reclassified to Inventory Cost             200,000                              
Derivative Asset, Fair Value, Gross Asset             275,000 295,000                            
Derivative Asset, Fair Value, Gross Liability             0 161,000                            
Cost of Goods and Services Sold             161,543,000 193,583,000 197,069,000                   100,000 100,000    
Property, Plant and Equipment, Useful Life                             5 years 15 years            
Number of Reporting Units             2                              
Development Stage Entities, Stock Issued, Shares, Issued for Noncash Consideration (in Shares)             3,200 7,600                            
Issuance of Stock and Warrants for Services or Claims             $ 25,200 $ 56,100