Note 20 - Industry Segment and Geographic Information (Details) (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) [Line Items]                      
Number of Reportable Segments                 2    
Revenues $ 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]
Export Sales [Member]
                      
Note 20 - Industry Segment and Geographic Information (Details) [Line Items]                      
Revenues                 120,000 142,000 165,000
Transferred From Animal Nutrition To Human Nutrition Segment [Member]
                      
Note 20 - Industry Segment and Geographic Information (Details) [Line Items]                      
Revenues                 1,300 1,600 400
Customer A [Member]
                      
Note 20 - Industry Segment and Geographic Information (Details) [Line Items]                      
Revenues                 22,700 43,500 38,600
Customer B [Member]
                      
Note 20 - Industry Segment and Geographic Information (Details) [Line Items]                      
Revenues                     36,800
CHINA
                      
Note 20 - Industry Segment and Geographic Information (Details) [Line Items]                      
Revenues                 $ 47,400 $ 89,500 $ 102,600
[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.