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Quarterly Financial Data (unaudited) - Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Oct. 31, 2016
Aug. 01, 2016
Mar. 07, 2016
Mar. 10, 2015
Feb. 28, 2014
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]                                
Sales           $ 85,005 $ 83,711 $ 82,174 $ 77,191 $ 85,072 $ 83,880 $ 92,071 $ 84,864 $ 328,081 $ 345,887 $ 338,352
Less: excise tax           3,860 3,820 1,782 356 3,563 3,552 6,717 4,451 9,818 18,283 24,949
Net sales           81,145 79,891 80,392 76,835 81,509 80,328 85,354 80,413 318,263 327,604 313,403
Cost of sales           63,560 64,770 64,861 59,789 65,754 68,466 67,826 67,025 252,980 [1] 269,071 [1] 284,972 [1]
Gross profit           17,585 15,121 15,531 17,046 15,755 11,862 17,528 13,388 65,283 58,533 28,431
Selling, general and administrative expenses           6,987 6,981 6,404 6,321 5,681 5,497 8,025 6,480 26,693 25,683 20,101
Other operating (income) costs, net           0 (3,385) 0 0         (3,385) 0 1
Operating income           10,598 11,525 9,127 10,725 10,074 6,365 9,503 6,908 41,975 32,850 16,619
Equity In earnings (loss)           1,776 664 1,079 517 92 1,562 3,096 1,352 4,036 6,102 10,137
Interest expense           (314) (341) (328) (311) (160) (114) (129) (131) (1,294) (534) (816)
Income before income taxes           12,060 11,848 9,878 10,931 10,006 7,813 12,470 8,129 44,717 38,418 25,940
Income tax expense (Note 6)           3,775 2,316 3,570 3,872 3,527 1,042 4,599 3,059 13,533 12,227 2,265
Net income           $ 8,285 $ 9,532 $ 6,308 $ 7,059 $ 6,479 $ 6,771 $ 7,871 $ 5,070 $ 31,184 $ 26,191 $ 23,675
Basic and diluted earnings per share data (in dollars per share)           $ 0.48 $ 0.55 $ 0.37 $ 0.41 $ 0.38 $ 0.38 $ 0.44 $ 0.28 $ 1.82 $ 1.48 $ 1.32
Dividends per common share (in dollars per share) $ 0.02 $ 0.02 $ 0.08 $ 0.06 $ 0.05 $ 0.02 $ 0.02 $ 0 $ 0.08 $ 0 $ 0 $ 0 $ 0.06 $ 0.12    
[1] Includes related party purchases of $29,596, and $40,206, $37,007 for the years ended December 31, 2016, 2015, and 2014, respectively.