Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 30, 2014	Mar. 31, 2013
Statement of Financial Position [Abstract]
Interest Income (Expense), Net	$ (29)	$ 84
CURRENT ASSETS:
Cash and cash equivalents	33,486	28,715
Investments available-for-sale	13,843	15,625
Trade receivables - less allowance for doubtful accounts: $477 for 2014 and $469 for 2013	37,946	35,920
Inventories	26,192	28,208
Prepaid expenses and other current assets	3,160	2,613
Total current assets	114,627	111,081
PROPERTY, PLANT, AND EQUIPMENT:
Land	8,038	8,038
Buildings and improvements	68,801	68,268
Machinery and equipment	53,089	50,389
Transportation equipment	17,764	16,156
Office furniture and equipment including computer systems	11,183	10,204
Property, plant and equipment, gross	158,875	153,055
Less accumulated depreciation	68,406	62,081
Net property, plant, and equipment	90,469	90,974
OTHER ASSETS:
Goodwill	7,392	6,495
Intangible assets — less accumulated amortization: $3,069 for 2014 and $2,398 for 2013	8,509	7,678
Long-term investments	15,852	5,597
Other	344	323
Total other assets	32,097	20,093
Total assets	237,193	222,148
CURRENT LIABILITIES:
Accounts payable — trade	18,306	18,516
Dividends payable	3,823	3,592
Accrued payroll and employee benefits	5,555	5,391
Deferred income taxes	2,900	2,554
Income tax payable	1,444	1,446
Other current liabilities	3,801	3,626
Total current liabilities	35,829	35,125
PENSION WITHDRAWAL LIABILITY	6,887	7,136
OTHER LONG-TERM LIABILITIES	1,878	1,653
DEFERRED INCOME TAXES	10,186	8,062
Total liabilities	54,780	51,976
COMMITMENTS AND CONTINGENCIES	0	0
SHAREHOLDERS’ EQUITY:
Common stock; authorized: 30,000,000 shares of $0.05 par value; 10,562,400 and 10,495,427 shares issued and outstanding for 2014 and 2013, respectively	528	525
Additional paid-in capital	50,502	48,779
Retained earnings	131,427	120,974
Accumulated other comprehensive loss	(44)	(106)
Total shareholders’ equity	182,413	170,172
Total liabilities and shareholders’ equity	$ 237,193	$ 222,148