Note 5 - Employee Benefit Plans (Details) - Components of net periodic postretirement benefit cost and other amounts (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 30, 2013	Mar. 31, 2012
Net periodic postretirement benefit cost:
Service cost	$ 59	$ 127
Interest cost	41	40
Amortization of prior service cost	58	13
	158	180
Benefit obligations recognized in other comprehensive income:
Amortization of prior service cost	(58)	(13)
Net loss	58	65
		52
Total recognized in net periodic benefit cost and other comprehensive income	158	232
Amount recognized in accumulated other comprehensive income, at end of fiscal year:
Unrecognized prior service cost	$ 258	$ 258