Note 20 - Industry Segment and Geographic Information (Details) - Geographical Distribution of Revenues (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
Note 20 - Industry Segment and Geographic Information (Details) - Geographical Distribution of Revenues [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%
UNITED STATES
                      
Note 20 - Industry Segment and Geographic Information (Details) - Geographical Distribution of Revenues [Line Items]                      
Revenues (in Dollars)                 123,900 93,800 86,600
Percent                 50.70% 39.80% 34.40%
MEXICO
                      
Note 20 - Industry Segment and Geographic Information (Details) - Geographical Distribution of Revenues [Line Items]                      
Revenues (in Dollars)                 1,300 900 900
Percent                 0.50% 0.40% 0.30%
Europe [Member]
                      
Note 20 - Industry Segment and Geographic Information (Details) - Geographical Distribution of Revenues [Line Items]                      
Revenues (in Dollars)                 31,500 18,600 30,300
Percent                 12.90% 7.90% 12.10%
CANADA
                      
Note 20 - Industry Segment and Geographic Information (Details) - Geographical Distribution of Revenues [Line Items]                      
Revenues (in Dollars)                 11,600 13,200 15,400
Percent                 4.80% 5.60% 6.10%
Asia [Member]
                      
Note 20 - Industry Segment and Geographic Information (Details) - Geographical Distribution of Revenues [Line Items]                      
Revenues (in Dollars)                 70,900 [5] 104,200 [5] 114,300 [5]
Percent                 29.00% [5] 44.20% [5] 45.40% [5]
South and Central America [Member]
                      
Note 20 - Industry Segment and Geographic Information (Details) - Geographical Distribution of Revenues [Line Items]                      
Revenues (in Dollars)                 4,800 4,700 4,000
Percent                 2.00% 2.00% 1.60%
Other Region [Member]
                      
Note 20 - Industry Segment and Geographic Information (Details) - Geographical Distribution of Revenues [Line Items]                      
Revenues (in Dollars)                 $ 300 $ 200 $ 200
Percent                 0.10% 0.10% 0.10%
[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.
[5] Of this balance, China comprised approximately $47.4 million, $89.5 million and $102.6 million for the years ended December 31, 2013, 2012 and 2011, respectively.