Note 5 - Loans (Details Textual) Pure in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Loans and Leases Receivable, Deferred Expense Income	$ 564,000	$ 592,000
Loans and Leases Receivable, Collateral for Secured Borrowings	8,000,000	11,000,000
Financing Receivable, Past Due	$ 15,159,000	$ 10,544,000
Financing Receivable, Modifications, Number of Contracts	0	0
Mortgage Loans in Process of Foreclosure, Amount	$ 239,000	$ 528,000
Impaired or Nonaccrual Financing Receivable, Interest Received Used to Reduce Principal	552,000	93,000	$ 338,000
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans	491,000	391,000	159,000
Impaired Financing Receivable, Interest Income, Cash Basis Method, Total	$ 0	$ 0	$ 0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts	0	0
Directors and Executive Officers [Member]
Financing Receivable, Past Due	$ 0	$ 500,000