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Consolidated Statements of Operations and Comprehensive Income (Unaudited) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Revenues $ 66,933 $ 104,031 $ 147,236 $ 194,802
Revenues – related parties 1,106 2,032 3,000 3,426
Cost of goods sold 59,048 75,492 127,979 134,789
Cost of goods sold – related parties 1,427 1,725 4,096 12,345
Distribution 907 1,107 1,791 1,858
Distribution – related parties 79 113 190 229
Gross profit 6,578 27,626 16,180 49,007
Selling, general, and administrative expenses        
Compensation expense (inclusive of $204 of stock based compensation for the three months ended June 30, 2014) 855 1,015 1,609 1,941
Other expense 536 762 1,167 1,268
Related party expense 147 83 211 166
Research and development expenses 869 791 1,571 1,707
2,407 2,651 4,558 5,082
Income from operations 4,171 24,975 11,622 43,925
Interest and dividend income 1,567 1,689 3,937 2,842
Interest expense (7) (6) (13) (12)
Gain on marketable securities 2,949 2,030 2,900 2,089
Other income (64) (34) 166 (34)
4,445 3,679 6,990 4,885
Income before income taxes 8,616 28,654 18,612 48,810
Provision for income taxes 3,269 10,498 6,991 16,604
Net income 5,347 18,156 11,621 32,206
Earnings per common share        
Basic (in Dollars per share) $ 0.12 $ 0.42 $ 0.27 $ 0.75
Diluted (in Dollars per share) $ 0.12 $ 0.42 $ 0.27 $ 0.75
Weighted average shares outstanding        
Basic (in Shares) 43,352,836 43,334,441 43,348,195 43,132,398
Diluted (in Shares) 43,550,129 43,361,555 43,471,880 43,156,827
Comprehensive Income        
Other comprehensive income/(loss) from unrealized net gains/(losses) on available-for-sale securities, net of tax of $1,597 in 2014 and of ($1,143) in 2013 2,511 (1,836) 1,747 3,543
Comprehensive income $ 7,858 $ 16,320 $ 13,368 $ 35,749