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Income Tax (narrative) (detail) (USD $)
 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Income Tax Disclosure [Abstract]      
Other Amounts Related To Income Taxes $ 1,851,000 $ 1,778,000  
Unrecognized Tax Benefits, Period Increase (Decrease) 58,000 18,000  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 184,000 126,000  
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority     3,767,000
Tax Credit Carryforward [Line Items]      
Valuation allowance - non-current 758,000 906,000  
Deferred Income Tax Asset, Net 9,400,000 8,637,000  
Deferred Tax Assets, Net, Noncurrent 2,097,000 403,000  
California [Member]
      
Tax Credit Carryforward [Line Items]      
Tax Credit Carryforward, Valuation Allowance 1,202,000    
Wisconsin [Member]
      
Tax Credit Carryforward [Line Items]      
Tax Credit Carryforward, Valuation Allowance $ 848,000    
Expiration Date 2022