Segments (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Summary of segment profit or loss:
Net revenue from external customers	$ 85,667,780	$ 59,129,485	$ 191,682,949	$ 137,440,975
Income from operations	7,407,711	4,067,357	10,670,384	8,036,537
Interest income	336,414	342,188	577,747	637,790
Interest expense	774,693	736,695	1,481,808	1,528,224
Depreciation and amortization	1,571,201	2,060,246	3,462,128	3,690,891
Income tax expense	1,879,752	768,541	2,758,674	1,478,172
Wholesale segment [Member]
Summary of segment profit or loss:
Net revenue from external customers	36,394,581	27,051,468	75,836,070	58,711,923
Income from operations	2,538,511	2,547,245	3,954,431	5,339,873
Interest income	324,638	332,268	551,265	624,195
Interest expense	633,051	678,069	1,199,618	1,412,096
Depreciation and amortization	251,227	244,604	515,773	478,315
Income tax expense	612,044	400,680	946,118	828,834
Retail segment [Member]
Summary of segment profit or loss:
Net revenue from external customers	49,273,199	32,078,017	115,846,879	78,729,052
Income from operations	4,869,200	1,520,112	6,715,953	2,696,664
Interest income	11,776	9,920	26,482	13,595
Interest expense	141,642	58,626	282,190	116,128
Depreciation and amortization	1,319,974	1,815,642	2,946,355	3,212,576
Income tax expense	$ 1,267,708	$ 367,861	$ 1,812,556	$ 649,338