Note 2 - Discontinued Operations - Asset and Liabilities in Discontinued Operations (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018	Mar. 31, 2019
Noncurrent Assets Held For Sale-Discontinued Operations		$ 1,143	$ 20,641	$ 1,143	$ 20,641	$ 1,143
Net Loss From Discontinued Operations, Net of Tax			14,750		8,155
Modesto Facility [Member] | Discontinued Operations, Disposed of by Sale [Member]
Accounts Receivable			5,058		5,058
Inventories			18,632		18,632
Other Current Assets		98		98		98
Current Assets Held For Sale-Discontinued Operations		98	23,690	98	23,690	98
Other Assets		1,143	1,674	1,143	1,674	1,143
Property, Plant and Equipment (net)			18,967		18,967
Noncurrent Assets Held For Sale-Discontinued Operations		1,143	20,641	1,143	20,641	1,143
Accounts Payable and Accrued Expenses		3,649	16,178	3,649	16,178	4,285
Long-Term Debt and Capital Leases Current Portion			122		122
Current Liabilities Held For Sale-Discontinued Operations		3,649	16,300	3,649	16,300	4,285
Long-Term Debt and Capital Lease Obligations			552		552
Noncurrent Liabilities Held For Sale Discontinued Operations			552		552
Net Sales			10,750		110,049
Cost of Product Sold			13,887		124,076
Selling, General and Administrative			218		998
Plant Restructuring Charge (a)	[1]		1,714		3,496
Interest (Income) Expense (b)	[2]		453		1,077
Total cost and expenses			16,272		129,647
Loss From Discontinued Operations Before Income Taxes			(5,522)		(19,598)
Gain on the Sale of Assets Before Income Taxes (c) (d)	[3],[4]		(24,628)		(30,266)
Income Tax Benefit			4,356		2,513
Net Loss From Discontinued Operations, Net of Tax			14,750		8,155
Capital Expenditures					3,937
Depreciation			$ 618		$ 1,295

[1] Includes $1,653,000 and $1,648,000 of Modesto severance in the three and six 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 six months.

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