Consolidated Statements Of Earnings (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Consolidated Statements Of Earnings [Abstract]
Net sales	$ 30,730,613	$ 27,301,355	$ 85,134,869	$ 79,910,378
Costs and expenses:
Cost of goods sold	19,534,980	17,357,408	54,160,450	51,650,960
Selling and administrative expenses	8,587,487	7,953,631	25,983,070	23,919,637
Interest expense	8,935	8,228	20,817	16,306
Total expenses	28,131,402	25,319,267	80,164,337	75,586,903
Earnings before taxes on income	2,599,211	1,982,088	4,970,532	4,323,475
Income tax expense	720,000	610,000	1,560,000	1,460,000
Net earnings	$ 1,879,211	$ 1,372,088	$ 3,410,532	$ 2,863,475
Weighted average number of shares outstanding during the period (Basic)	5,986,676	5,900,595	5,986,884	5,903,457
Weighted average number of shares outstanding during the period (Diluted)	6,079,430	5,954,578	6,080,840	5,957,409
Per Share Data:
Net earnings	$ 0.31	$ 0.23	$ 0.57	$ 0.49
Diluted:
Net earnings	$ 0.31	$ 0.23	$ 0.56	$ 0.48
Cash dividends per common share	$ 0.135	$ 0.135	$ 0.405	$ 0.405