Note 2 - Discontinued Operations (Details Textual) - Modesto Facility [Member] - Discontinued Operations, Disposed of by Sale [Member] - USD ($)		3 Months Ended
Jul. 13, 2018	Jun. 29, 2019
Proceeds from Divestiture of Businesses, Net of Cash Divested, Total	$ 63,326,000
Disposal Group, Including Discontinued Operation, Revenue, Percent		15.00%

This element represents the cash inflow during the period from the sale of a component of the entity.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585

Name:	us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration