Note 20 - Industry Segment and Geographic Information (Details) - Revenues by Product (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Revenue from External Customer [Line Items]                      
Revenues (in Dollars) $ 65,973 [1] $ 87,620 [1] $ 41,777 [1] $ 48,923 [1] $ 63,133 [1] $ 83,970 [1] $ 47,448 [1] $ 41,088 [1] $ 244,293 [2] $ 235,639 [3] $ 251,743 [4]
Percent                 100.00% 100.00% 100.00%
Fish Meal [Member]
                      
Revenue from External Customer [Line Items]                      
Revenues (in Dollars)                 142,500 160,700 175,500
Percent                 58.30% 68.20% 69.80%
Fish Oil [Member]
                      
Revenue from External Customer [Line Items]                      
Revenues (in Dollars)                 43,800 27,600 39,600
Percent                 18.00% 11.70% 15.70%
Refined Fish Oil [Member]
                      
Revenue from External Customer [Line Items]                      
Revenues (in Dollars)                 22,700 17,800 15,600
Percent                 9.30% 7.60% 6.20%
Fish Solubles and Other [Member]
                      
Revenue from External Customer [Line Items]                      
Revenues (in Dollars)                 4,200 7,500 5,800
Percent                 1.70% 3.20% 2.30%
Dietary Supplement and Food Ingredients and Products [Member]
                      
Revenue from External Customer [Line Items]                      
Revenues (in Dollars)                 $ 31,100 $ 22,000 $ 15,200
Percent                 12.70% 9.30% 6.00%
[1] Revenues, gross profit, operating income, and net income (loss) are rounded to thousands each quarter. Therefore, the sum of the quarterly amounts may not equal the annual amounts reported.
[2] Excludes revenue from internal customers of $1.3 million for fish oil that was transferred from the animal nutrition segment to the human nutrition segment at cost.
[3] Excludes revenue from internal customers of $1.6 million for fish oil that was transferred from the animal nutrition segment to the human nutrition segment at cost.
[4] Excludes revenue from internal customers of $0.4 million for fish oil that was transferred from the animal nutrition segment to the human nutrition segment at cost.