Condensed Consolidated Statements of Income - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Sales		$ 87,852	$ 83,711	$ 267,089	$ 243,076
Less: excise taxes		1,519	3,820	7,834	5,958
Net sales		86,333	79,891	259,255	237,118
Cost of sales	[1]	67,708	64,770	202,764	189,420
Gross profit		18,625	15,121	56,491	47,698
Selling, general and administrative expenses		8,154	6,981	24,114	19,706
Other operating income, net		0	(3,385)	0	(3,385)
Operating income		10,471	11,525	32,377	31,377
Gain on sale of equity method investment		11,381	0	11,381	0
Equity method investment earnings (loss)		0	664	(348)	2,260
Interest expense, net		(224)	(341)	(934)	(980)
Income before income taxes		21,628	11,848	42,476	32,657
Income tax expense		7,491	2,316	13,292	9,758
Net income		14,137	9,532	29,184	22,899
Income attributable to participating securities		414	294	806	711
Net income attributable to common shareholders and used in EPS calculation		$ 13,723	$ 9,238	$ 28,378	$ 22,188
Share information:
Diluted weighted average common shares (in shares)		16,751,346	16,653,717	16,735,378	16,626,024
Basic and diluted earnings per common share (in dollars per share)		$ 0.82	$ 0.55	$ 1.70	$ 1.33
Dividends and dividend equivalents per common share (in dollars per share)		$ 0.89	$ 0.02	$ 0.97	$ 0.10

[1] Includes related party purchases of $0 and $6,700 for the quarters ended September 30, 2017 and 2016, respectively. Includes related party purchases of $18,425 and $19,639 for the year to date periods ended September 30, 2017 and 2016, respectively.