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Note 1 - Presentation of Interim Information (Details Textual) - USD ($)		3 Months Ended		6 Months Ended
	Jul. 23, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums, Total		$ 121,000		$ 121,000		$ 317,000
Interest and Fee Income, Loans and Leases, Total		5,746,000	$ 6,095,000	11,819,000	$ 12,371,000
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		336,000		961,000
SBA CARES Act Paycheck Protection Program [Member] \| Subsequent Event [Member]
Proceeds from Collection of Notes Receivable	$ 41,700,000
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums, Total	$ 1,100,000
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