Note 7 - Inventory (Tables)
 12 Months Ended
Dec. 31, 2013
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
    2013     2012  
    (in thousands)    

Fish meal

  $ 30,119     $ 26,511  

Fish oil

    41,081       17,352  

Fish solubles

    2,599       1,391  

Nutraceutical products

    3,650       4,181  

Dairy protein products

    1,355       —  

Unallocated inventory cost pool (including off-season costs)

    6,655       7,403  

Other materials and supplies

    8,880       9,821  

Total inventory

  $ 94,339     $ 66,659