Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Sep. 28, 2014	Sep. 29, 2013
Statement of Cash Flows [Abstract]
Net Income	$ 12,168	$ 10,319
Reconciliation to cash flows:
Depreciation and amortization	6,071	6,748
Stock compensation expense	767	596
(Gain) loss from property disposals	(47)	53
Changes in operating accounts providing (using) cash:
Trade receivables	2,348	(888)
Inventories	(11,100)	(3,418)
Accounts payable	50	274
Accrued liabilities	(1,633)	(424)
Income taxes	(615)	193
Other	1,582	1,343
Net Cash Provided by (Used in) Operating Activities	9,591	14,796
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to property, plant, and equipment	(6,242)	(6,529)
Purchases of investments	(12,409)	(13,791)
Sale and maturities of investments	7,225	9,245
Proceeds from property disposals	108	55
Net cash used in investing activities	(11,318)	(11,020)
CASH FLOWS FROM FINANCING ACTIVITIES:
Cash dividends paid	(3,823)	(3,592)
New Shares Issued	491	459
Shares Surrendered for payroll taxes	(295)	(485)
Proceeds from the exercise of stock options	0	186
Excess tax benefit from share-based compensation	0	52
Shares repurchased	(1,431)	0
Net cash used in financing activities	(5,058)	(3,380)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(6,785)	396
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	33,486	28,715
CASH AND CASH EQUIVALENTS, END OF PERIOD	26,701	29,111
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Cash paid for income taxes	7,945	5,947
Noncash investing activities - Capital expenditures in accounts payable	$ 1,035	$ 589