Note 2 - Discontinued Operations - Asset and Liabilities in Discontinued Operations (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Dec. 28, 2019	Dec. 29, 2018	Dec. 28, 2019	Dec. 29, 2018	Mar. 31, 2019
Noncurrent Assets Held For Sale-Discontinued Operations		$ 1,054	$ 1,739	$ 1,054	$ 1,739	$ 1,143
Net Earnings From Discontinued Operations, Net of Tax		955	34,056	955	42,211
Modesto Facility [Member] | Discontinued Operations, Disposed of by Sale [Member]
Accounts Receivable			1,441		1,441
Inventories			4,645		4,645
Other Current Assets		98	5,977	98	5,977	98
Current Assets Held For Sale-Discontinued Operations		98	12,063	98	12,063	98
Other Assets		1,054	1,739	1,054	1,739	1,143
Noncurrent Assets Held For Sale-Discontinued Operations		1,054	1,739	1,054	1,739	1,143
Accounts Payable and Accrued Expenses		2,744	8,697	2,744	8,697	4,285
Current Liabilities Held For Sale-Discontinued Operations		2,744	8,697	2,744	8,697	$ 4,285
Net Sales			1,644		111,693
Cost of Product Sold		57	5,796	57	129,872
Selling, General and Administrative			137		1,135
Disposal Group, Including Discontinued Operation, Restructuriing Charge	[1]	(902)	854	(902)	4,350
Interest Expense (b)	[2]				1,077
Total cost and expenses		(845)	6,787	(845)	136,434
Loss From Discontinued Operations Before Income Taxes		845	(5,143)	845	(24,741)
Gain on the Sale of Assets Before Income Taxes (c) (d)	[3],[4]	(430)	(50,411)	(430)	(80,677)
Income Tax Expense		320	11,212	320	13,725
Net Earnings From Discontinued Operations, Net of Tax		955	34,056	955	42,211
Capital Expenditures					3,937
Depreciation			$ 7		$ 1,302

[1] Includes $902,000 credit for pension termination in both the three and nine month periods of the current year. Includes $278,000 and $3,579,000 of Modesto severance in the three and nine month periods of prior year, respectively.

[2] Includes interest on debt directly related to Modesto including the building mortgage and equipment capital leases and an allocation of the Company's line of credit facilty.

[3] Includes a $24,211,000 gain from LIFO layer liquidations from the disposal of the inventory for both prior three and nine months.

[4] Includes a $4,975,000 gain on the sale of bins for the prior nine months period.