Note 1 - Presentation of Interim Information (Details Textual) - USD ($)		3 Months Ended
	Apr. 22, 2022	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums		$ 1,156,000		$ 1,124,000
Interest and Fee Income, Loans and Leases, Total		5,493,000	$ 6,073,000
SBA CARES Act Paycheck Protection Program [Member]
Financing Receivable, before Allowance for Credit Loss, Total				62,400,000
Interest and Fee Income, Loans and Leases, Total		$ 25,000	$ 625,000
SBA CARES Act Paycheck Protection Program [Member] | Subsequent Event [Member]
Proceeds from Collection of Notes Receivable	$ 61,600,000
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums	$ 9,000
SBA CARES Act Paycheck Protection Program [Member] | Second Draw Loans [Member]
Financing Receivable, before Allowance for Credit Loss, Total				$ 16,500,000