Consolidated Statements of Operations - USD ($) $ 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
Income Statement [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 taxes						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
Insurance recoveries (Note 16)														0		0		(8,290)
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 method investment earnings (Note 3)						1,776	664	1,079	517	92	1,562	3,096	1,352	4,036		6,102		10,137
Interest expense, net						(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
Income attributable to participating securities														954		873		832
Net income attributable to common shareholders and used in earnings per share calculation (Note 6)														$ 30,230		$ 25,318		$ 22,843
Share information
Diluted weighted average common shares														16,643,811		17,123,556		17,305,866
Basic and diluted earnings per share (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									$ 0.12		$ 0.06		$ 0.05

[1] Includes related party purchases of $29,596, and $40,206, $37,007 for the years ended December 31, 2016, 2015, and 2014, respectively.