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Income Taxes (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Current:      
Federal $ 4,301,000 $ 3,752,000 $ 4,259,000
State 768,000 702,000 454,000
Current income taxes 5,069,000 4,454,000 4,713,000
Deferred:      
Federal 699,000 396,000 191,000
State (89,000) 56,000 115,000
Deferred income taxes 610,066 451,702 305,830
Total income tax provision 5,678,506 4,905,708 5,019,136
Net operating loss carryforwards for federal income tax 1,300,000    
Future benefit of the federal net operating loss carryforwards, limit per year 300,000    
Current deferred tax assets:      
Reserves 383,000 377,000  
Inventory capitalization 205,000 230,000  
Compensation programs 245,000 262,000  
Retirement liability 55,000 72,000  
Equity-based compensation 228,000 228,000  
Total current deferred tax assets 1,115,959 1,168,749  
Long-term deferred tax assets / (liabilities):      
Excess of book over tax basis of fixed assets (1,688,000) (1,421,000)  
Goodwill (751,000) (691,000)  
Intangible assets (69,000) (146,000)  
Total long-term deferred tax liabilities (2,508,000) (2,258,000)  
Net operating loss carryforwards 443,000 544,000  
Deferred rent 67,000 64,000  
Compensation programs 408,000 358,000  
Total long-term deferred tax assets 918,000 966,000  
Net long-term deferred tax liabilities (1,590,000) (1,292,000)  
Deferred tax assets 2,034,000    
Reconciliation of actual tax provision from expected tax provision      
Computed "expected" tax rate (as a percent) 34.00% 34.00% 34.00%
Increase (decrease) in income taxes resulting from:      
State taxes, net of federal tax benefit (as a percent) 2.70% 3.40% 2.00%
Meals and entertainment (as a percent) 0.10% 0.10% 0.10%
R&D credits (as a percent) (0.10%) (0.40%) (0.30%)
Domestic production deduction (as a percent) (2.50%) (2.80%) (1.80%)
Non-deductible ISO stock option expense (as a percent) 0.10% 0.10% 0.10%
Unrecognized tax benefits (as a percent) (0.20%) (2.40%) 1.00%
Income of non-controlling interests (as a percent)   (1.00%) (0.40%)
Other (as a percent) 0.20% 0.30% 0.10%
Effective tax rate (as a percent) 34.30% 31.30% 34.80%
Reconciliation of the beginning and ending amount of gross unrecognized tax benefits (UTB) resulting from uncertain tax positions      
Gross UTB balance at beginning of fiscal year 320,000 685,000  
Increases for tax positions of prior years   40,000  
Reductions for tax positions of prior years (30,000) (405,000)  
Gross UTB balance at the end of fiscal year 290,000 320,000 685,000
Total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate 290,000 320,000  
Amount of unrecognized tax benefits expected to be reduced $ 265,000