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Note 1 - Presentation of Interim Information (Details Textual) - USD ($)		3 Months Ended		9 Months Ended
	Oct. 19, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums, Total		$ 912,000		$ 912,000		$ 317,000
Interest and Fee Income, Loans and Leases, Total		6,252,000	$ 6,012,000	18,071,000	$ 18,383,000
SBA CARES Act Paycheck Protection Program [Member]
Financing Receivable, before Allowance for Credit Loss, Total		62,400,000		62,400,000
Interest and Fee Income, Loans and Leases, Total		784,000	$ 204,000	1,700,000	$ 358,000
SBA CARES Act Paycheck Protection Program [Member] \| Subsequent Event [Member]
Proceeds from Collection of Notes Receivable	$ 49,700,000
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums, Total	$ 268,000
SBA CARES Act Paycheck Protection Program [Member] \| Second Draw Loans [Member]
Financing Receivable, before Allowance for Credit Loss, Total		$ 16,500,000		$ 16,500,000