Borrowings Under Revolving Credit Facility (Details) (USD $)	0 Months Ended	12 Months Ended
	Dec. 27, 2012	Mar. 31, 2013	Apr. 01, 2012	Mar. 27, 2011	Mar. 30, 2008	Dec. 21, 2012	May 31, 2007
Line of Credit Facility [Line Items]
Maximum borrowings during period		$ 18,989,600	$ 20,118,300	$ 18,954,800
Covenant compliance		The Company was in compliance with the terms and financial covenants applicable to each of the revolving credit facility and term loan facility	The Company was in compliance with the terms and financial covenants applicable to each of the revolving credit facility and term loan facility	The Company was in compliance with the terms and financial covenants applicable to each of the revolving credit facility and term loan facility
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity						35,000,000	50,000,000
Expiration date		May 31, 2014			May 31, 2010
Common stock dividends (in dollars per share)	$ 0.75
Dividends payable, date paid		Dec. 27, 2012
Dividends payable, date of record		Dec. 13, 2012
Interest rate variable rate basis					LIBOR
Weighted average interest rate (in hundredths)		2.68%	2.48%	2.57%
Interest expense		77,400	112,600	136,300
Average borrowings during period		2,858,500	4,411,592	5,312,700
Amount outstanding		0	0
Revolving Credit Facility [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Interest rate spread on variable rate basis (in hundredths)		1.75%
Revolving Credit Facility [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Dividend payment permitted by lender agreement					6,250,000
Rolling dividend payment period permitted by lender agreement					12 months
Stock repurchase permitted by lender agreement					30,000,000
Interest rate spread on variable rate basis (in hundredths)		2.75%