Note 23 - Quarterly Financial Data (Unaudited) (Details) - Unaudited Operating Results (USD $)
In Thousands, except Per Share data, 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
Unaudited Operating Results [Abstract]                      
Revenues (1) $ 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]
Gross profit (1) (4) 27,950 [1],[5] 29,420 [1],[5] 13,283 [1],[5] 12,097 [1],[5] 12,919 [1] 13,398 [1] 6,847 [1] 8,892 [1] 82,750 42,056 54,674
Operating income (1)(5) 14,679 [1],[6] 21,921 [1],[6] 6,690 [1],[6] 4,723 [1],[6] 2,351 [1],[7] 2,904 [1],[7] 4,201 [1],[7] 3,170 [1],[7] 48,013 12,626 54,359
Net income (1) $ 9,718 [1] $ 13,962 [1] $ 3,990 [1] $ 2,845 [1] $ (508) [1],[7] $ 231 [1],[7] $ 2,510 [1],[7] $ 1,830 [1],[7] $ 30,515 $ 4,063 $ 34,157
Earnings per share (2):                      
Basic (in Dollars per share) $ 0.47 [8] $ 0.68 [8] $ 0.20 [8] $ 0.14 [8] $ (0.03) [8] $ 0.01 [8] $ 0.13 [8] $ 0.09 [8] $ 1.50 $ 0.21 $ 1.77
Diluted (in Dollars per share) $ 0.45 [8] $ 0.66 [8] $ 0.19 [8] $ 0.14 [8] $ (0.03) [8] $ 0.01 [8] $ 0.13 [8] $ 0.09 [8] $ 1.45 $ 0.20 $ 1.71
[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] Gross profit as a percentage of revenues for the quarter ended December 31, 2013 increased substantially as compared to the previous three quarters of 2013. This increase was due to greater than anticipated inventory production after September 30, 2013. As a result, standard cost for 2013 inventory, for which sales commenced largely in the third quarter of 2013, was decreased and cumulatively adjusted all previous sales of 2013 inventory production during the quarter ended December 31, 2013. The impact of the change in standard cost to the quarter ended December 31, 2013 is estimated to be approximately $4 million.
[6] Included in the quarter ended December 31, 2013 expense is a $6.6 million charge related to the loss on the plant closure.
[7] Included in the quarter ended September 30, 2012 expense is a $4.1 million charge related to the U.S. Attorney investigation. A similar additional charge of $3.6 million was recognized for the quarter ended December 31, 2012. These charges were non-deductible for federal tax purposes.
[8] Earnings per share are computed independently for each quarter and the full year based upon respective average shares outstanding. Therefore, the sum of the quarterly earnings per share amounts may not equal the annual amounts reported.