Note 4 - Restricted Equity Securities (Details Textual) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Federal Home Loan Bank Certificates and Obligations (FHLB) [Member]
Restricted Investments	$ 4,680,000	$ 3,012,000

Investments which are not defined as or included in marketable (debt, equity, or other) securities whose use is restricted in whole or in part, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.

No definition available.

Name:	us-gaap_RestrictedInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant