Segments (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Summary of segment profit or loss:
Net revenue from external customers	$ 75,726,998	$ 85,667,780	$ 173,629,960	$ 191,682,949
Income from operations	4,859,050	7,407,711	8,298,100	10,670,384
Interest income	215,351	336,414	538,755	577,747
Interest expense	716,441	774,693	1,492,287	1,481,808
Depreciation and amortization	2,168,054	1,571,201	4,678,225	3,462,128
Income tax expense	1,378,827	1,879,752	2,203,964	2,758,674
Wholesale segment [Member]
Summary of segment profit or loss:
Net revenue from external customers	29,792,039	36,394,581	63,065,965	75,836,070
Income from operations	1,752,665	2,538,511	3,584,692	3,954,431
Interest income	192,845	324,638	501,180	551,265
Interest expense	522,669	633,051	1,116,595	1,199,618
Depreciation and amortization	254,784	251,227	597,311	515,773
Income tax expense	415,887	612,044	870,963	946,118
Retail segment [Member]
Summary of segment profit or loss:
Net revenue from external customers	45,934,959	49,273,199	110,563,995	115,846,879
Income from operations	3,106,385	4,869,200	4,713,408	6,715,953
Interest income	22,506	11,776	37,575	26,482
Interest expense	193,772	141,642	375,692	282,190
Depreciation and amortization	1,913,270	1,319,974	4,080,914	2,946,355
Income tax expense	$ 962,940	$ 1,267,708	$ 1,333,001	$ 1,812,556