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Income Taxes (Details) (USD $)
 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Income Taxes      
Material uncertain tax positions $ 0 $ 0  
Income tax refunds 258,000    
Current tax provision      
Federal 4,440,000 4,233,000 3,291,000
State 280,000 437,000 691,000
Total 4,720,000 4,670,000 3,982,000
Deferred tax provision:      
Federal (180,000) (237,000) (342,000)
State (12,000) (21,000) (72,000)
Total (192,000) (258,000) (414,000)
Total 4,528,000 4,412,000 3,568,000
Current deferred tax assets:      
Accrued employee-related expenses 125,000 211,000  
Asset reserves 226,000 196,000  
Stock option deductible differences 243,000 99,000  
Inventory 252,000 204,000  
Current deferred tax assets 846,000 710,000  
Long-term deferred tax liability:      
Property, plant and equipment (1,320,000) (1,299,000)  
Goodwill and intangible assets (1,044,000) (1,220,000)  
Long-term deferred tax liability (2,364,000) (2,519,000)  
Net deferred tax liability (1,518,000) (1,809,000)  
Reconciliation of our income tax provision and the amounts computed by applying statutory rates to income before income taxes      
Income taxes at statutory rates 4,543,000 4,193,000 3,313,000
State income taxes, net of federal benefit 158,000 285,000 272,000
Tax benefit of stock option exercises 197,000 61,000 90,000
Section 199 manufacturing deduction (357,000) (347,000) (273,000)
Other (13,000) 220,000 166,000
Total $ 4,528,000 $ 4,412,000 $ 3,568,000