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14. QUARTERLY RESULTS OF OPERATIONS (UNAUDITED) (Details) - Unaudited Quarterly Results (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
2014                      
Net sales $ 78,906,687us-gaap_SalesRevenueNet $ 72,729,678us-gaap_SalesRevenueNet $ 68,822,520us-gaap_SalesRevenueNet $ 65,783,284us-gaap_SalesRevenueNet $ 61,559,288us-gaap_SalesRevenueNet $ 70,176,216us-gaap_SalesRevenueNet $ 59,419,751us-gaap_SalesRevenueNet $ 53,715,476us-gaap_SalesRevenueNet $ 286,242,169us-gaap_SalesRevenueNet $ 244,870,731us-gaap_SalesRevenueNet $ 228,537,050us-gaap_SalesRevenueNet
Gross margin 27,648,122us-gaap_GrossProfit 24,273,792us-gaap_GrossProfit 22,585,662us-gaap_GrossProfit 21,853,149us-gaap_GrossProfit 21,821,524us-gaap_GrossProfit 22,739,670us-gaap_GrossProfit 20,310,487us-gaap_GrossProfit 18,670,770us-gaap_GrossProfit 96,360,725us-gaap_GrossProfit 83,542,451us-gaap_GrossProfit 80,505,977us-gaap_GrossProfit
Net income 4,471,542us-gaap_NetIncomeLoss 3,138,507us-gaap_NetIncomeLoss 1,511,461us-gaap_NetIncomeLoss 723,788us-gaap_NetIncomeLoss 1,774,184us-gaap_NetIncomeLoss 2,934,196us-gaap_NetIncomeLoss 1,772,280us-gaap_NetIncomeLoss 892,096us-gaap_NetIncomeLoss 9,845,298us-gaap_NetIncomeLoss 7,372,756us-gaap_NetIncomeLoss 8,854,765us-gaap_NetIncomeLoss
Dividends paid $ 755,012us-gaap_PaymentsOfDividendsCommonStock $ 754,665us-gaap_PaymentsOfDividendsCommonStock $ 754,321us-gaap_PaymentsOfDividendsCommonStock $ 753,981us-gaap_PaymentsOfDividendsCommonStock $ 751,645us-gaap_PaymentsOfDividendsCommonStock $ 752,933us-gaap_PaymentsOfDividendsCommonStock $ 750,357us-gaap_PaymentsOfDividendsCommonStock   $ 3,017,979us-gaap_PaymentsOfDividendsCommonStock $ 2,254,935us-gaap_PaymentsOfDividendsCommonStock  
Net income per common share:                      
Basic (in Dollars per share) $ 0.59us-gaap_EarningsPerShareBasic $ 0.42us-gaap_EarningsPerShareBasic $ 0.20us-gaap_EarningsPerShareBasic $ 0.10us-gaap_EarningsPerShareBasic $ 0.24us-gaap_EarningsPerShareBasic $ 0.39us-gaap_EarningsPerShareBasic $ 0.24us-gaap_EarningsPerShareBasic $ 0.12us-gaap_EarningsPerShareBasic $ 1.30us-gaap_EarningsPerShareBasic $ 0.98us-gaap_EarningsPerShareBasic $ 1.18us-gaap_EarningsPerShareBasic
Diluted (in Dollars per share) $ 0.59us-gaap_EarningsPerShareDiluted $ 0.42us-gaap_EarningsPerShareDiluted $ 0.20us-gaap_EarningsPerShareDiluted $ 0.10us-gaap_EarningsPerShareDiluted $ 0.24us-gaap_EarningsPerShareDiluted $ 0.39us-gaap_EarningsPerShareDiluted $ 0.24us-gaap_EarningsPerShareDiluted $ 0.12us-gaap_EarningsPerShareDiluted $ 1.30us-gaap_EarningsPerShareDiluted $ 0.98us-gaap_EarningsPerShareDiluted $ 1.18us-gaap_EarningsPerShareDiluted