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Note 13 - Quarterly Financial Data (Unaudited) (Details) - Quarterly Financial Data (Unaudited) (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
Quarterly Financial Data (Unaudited) [Abstract]
Net sales	$ 24,471,605us-gaap_SalesRevenueGoodsNet	$ 19,417,234us-gaap_SalesRevenueGoodsNet	$ 19,703,607us-gaap_SalesRevenueGoodsNet	$ 19,838,466us-gaap_SalesRevenueGoodsNet	$ 21,549,141us-gaap_SalesRevenueGoodsNet	$ 18,524,604us-gaap_SalesRevenueGoodsNet	$ 18,973,013us-gaap_SalesRevenueGoodsNet	$ 19,237,827us-gaap_SalesRevenueGoodsNet
Gross profit	14,454,719us-gaap_GrossProfit	12,174,709us-gaap_GrossProfit	12,779,606us-gaap_GrossProfit	12,715,723us-gaap_GrossProfit	13,776,131us-gaap_GrossProfit	11,700,943us-gaap_GrossProfit	11,920,121us-gaap_GrossProfit	11,930,829us-gaap_GrossProfit	52,124,757us-gaap_GrossProfit	49,328,024us-gaap_GrossProfit	45,905,674us-gaap_GrossProfit
Net income	$ 2,458,462us-gaap_NetIncomeLoss	$ 1,628,562us-gaap_NetIncomeLoss	$ 1,765,485us-gaap_NetIncomeLoss	$ 1,854,412us-gaap_NetIncomeLoss	$ 2,488,211us-gaap_NetIncomeLoss	$ 1,561,832us-gaap_NetIncomeLoss	$ 1,629,353us-gaap_NetIncomeLoss	$ 1,586,321us-gaap_NetIncomeLoss	$ 7,706,921us-gaap_NetIncomeLoss	$ 7,265,717us-gaap_NetIncomeLoss	$ 5,596,070us-gaap_NetIncomeLoss
Basic (in Dollars per share)	$ 0.24us-gaap_EarningsPerShareBasic	$ 0.16us-gaap_EarningsPerShareBasic	$ 0.17us-gaap_EarningsPerShareBasic	$ 0.18us-gaap_EarningsPerShareBasic	$ 0.24us-gaap_EarningsPerShareBasic	$ 0.15us-gaap_EarningsPerShareBasic	$ 0.16us-gaap_EarningsPerShareBasic	$ 0.16us-gaap_EarningsPerShareBasic	$ 0.76us-gaap_EarningsPerShareBasic	$ 0.71us-gaap_EarningsPerShareBasic	$ 0.55us-gaap_EarningsPerShareBasic
Diluted (in Dollars per share)	$ 0.24us-gaap_EarningsPerShareDiluted	$ 0.16us-gaap_EarningsPerShareDiluted	$ 0.17us-gaap_EarningsPerShareDiluted	$ 0.18us-gaap_EarningsPerShareDiluted	$ 0.24us-gaap_EarningsPerShareDiluted	$ 0.15us-gaap_EarningsPerShareDiluted	$ 0.16us-gaap_EarningsPerShareDiluted	$ 0.16us-gaap_EarningsPerShareDiluted	$ 0.75us-gaap_EarningsPerShareDiluted	$ 0.71us-gaap_EarningsPerShareDiluted	$ 0.55us-gaap_EarningsPerShareDiluted
Basic (in Shares)	10,210,933us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	10,203,711us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	10,198,733us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	10,198,733us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	10,198,733us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	10,176,744us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	10,167,649us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	10,162,442us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	10,203,063us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	10,176,492us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	10,157,395us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in Shares)	10,244,127us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	10,241,410us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	10,239,823us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	10,239,505us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	10,233,009us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	10,221,512us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	10,216,535us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	10,194,219us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	10,241,121us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	10,216,438us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	10,175,346us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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