Note 15 - Subsequent Events (Details Textual) - USD ($) $ in Millions		9 Months Ended
Oct. 01, 2020	Sep. 30, 2020	Sep. 30, 2019
Payments of FHLBank Borrowings, Financing Activities		$ 6	$ 6
Subsequent Event [Member]
Payments of FHLBank Borrowings, Financing Activities	$ 8

Amount of cash outflow for repayment of Federal Home Loan Bank (FHLBank) borrowing, classified as financing activity.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585

Name:	us-gaap_RepaymentsOfFederalHomeLoanBankBorrowings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration