Note 2 - Discontinued Operations - Asset and Liabilities in Discontinued Operations (Details) - USD ($) $ in Thousands	Jun. 27, 2020	Mar. 31, 2020	Jun. 29, 2019
Noncurrent Assets Held For Sale-Discontinued Operations	$ 1,026	$ 1,026	$ 1,143
Current Liabilities Held For Sale-Discontinued Operations	0	880	3,653
Modesto Facility [Member] | Discontinued Operations, Disposed of by Sale [Member]
Other Current Assets	182	182	98
Current Assets Held For Sale-Discontinued Operations	182	182	98
Other Assets	1,026	1,026	1,143
Noncurrent Assets Held For Sale-Discontinued Operations	1,026	1,026	1,143
Accounts Payable and Accrued Expenses	0	880	3,653
Current Liabilities Held For Sale-Discontinued Operations	$ 0	$ 880	$ 3,653