Segments (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Summary of segment profit or loss:
Net revenue	$ 59,129,485	$ 47,195,031	$ 137,440,975	$ 100,421,204
Income from operations	4,067,357	2,422,116	8,036,537	5,185,636
Interest income	342,188	328,736	637,790	610,220
Interest expense	736,695	458,703	1,528,224	1,004,744
Depreciation and amortization	2,060,246	1,136,275	3,690,891	2,296,910
Income tax expense	768,541	321,010	1,478,172	845,866
Wholesale segment [Member]
Summary of segment profit or loss:
Net revenue	27,051,468	28,807,928	58,711,923	59,468,451
Income from operations	2,547,245	1,967,832	5,339,873	4,494,836
Interest income	332,268	325,486	624,195	603,785
Interest expense	678,069	424,193	1,412,096	938,754
Depreciation and amortization	244,604	248,435	478,315	498,899
Income tax expense	400,680	215,057	828,834	687,462
Retail segment [Member]
Summary of segment profit or loss:
Net revenue	32,078,017	18,387,103	78,729,052	40,952,753
Income from operations	1,520,112	454,284	2,696,664	690,800
Interest income	9,920	3,250	13,595	6,435
Interest expense	58,626	34,510	116,128	65,990
Depreciation and amortization	1,815,642	887,840	3,212,576	1,798,011
Income tax expense	$ 367,861	$ 105,953	$ 649,338	$ 158,404