Note 7 - Fair Value - Carrying Amount and Fair Value of Financial Instruments Included in the Consolidated Balance Sheet (Details) - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Debt securities, fair value	$ 166,155,000	$ 186,270,000
Securities - equities	5,000	5,000
Loans held for sale	120,000	469,000
Federal bank stock	5,547,000	5,715,000
Fair Value, Inputs, Level 1 [Member]
Debt securities, fair value	0	0
Securities - equities	5,000	5,000
Fair Value, Inputs, Level 2 [Member]
Debt securities, fair value	161,570,000	182,685,000
Securities - equities	0	0
Fair Value, Inputs, Level 3 [Member]
Debt securities, fair value	4,585,000	3,585,000
Securities - equities	0	0
Reported Value Measurement [Member]
Cash and cash equivalents	9,549,000	9,080,000
Interest earning time deposits	2,484,000	2,484,000
Debt securities, fair value	166,155,000	186,270,000
Securities - equities	5,000	5,000
Loans held for sale	120,000	469,000
Loans, net	794,932,000	780,010,000
Federal bank stock	5,547,000	5,715,000
Accrued interest receivable	3,970,000	3,731,000
Deposits	935,956,000	918,496,000
Borrowed funds	18,050,000	22,050,000
Accrued interest payable	333,000	338,000
Estimate of Fair Value Measurement [Member]
Cash and cash equivalents	9,549,000	9,080,000
Interest earning time deposits	2,484,000	2,484,000
Debt securities, fair value	166,155,000	186,270,000
Securities - equities	5,000	5,000
Loans held for sale	120,000	469,000
Loans, net	794,968,000	780,086,000
Accrued interest receivable	3,970,000	3,731,000
Deposits	938,613,000	921,811,000
Borrowed funds	17,647,000	22,121,000
Accrued interest payable	333,000	338,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	9,549,000	9,080,000
Interest earning time deposits	0	0
Debt securities, fair value	0	0
Securities - equities	5,000	5,000
Loans held for sale	0	0
Loans, net	0	0
Accrued interest receivable	59,000	35,000
Deposits	792,257,000	767,840,000
Borrowed funds	0	0
Accrued interest payable	4,000	5,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents	0	0
Interest earning time deposits	2,484,000	2,484,000
Debt securities, fair value	161,570,000	182,685,000
Securities - equities	0	0
Loans held for sale	120,000	469,000
Loans, net	0	0
Accrued interest receivable	958,000	817,000
Deposits	146,356,000	153,971,000
Borrowed funds	17,647,000	22,121,000
Accrued interest payable	329,000	333,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents	0	0
Interest earning time deposits	0	0
Debt securities, fair value	4,585,000	3,585,000
Securities - equities	0	0
Loans held for sale	0	0
Loans, net	794,968,000	780,086,000
Accrued interest receivable	2,953,000	2,879,000
Deposits	0	0
Borrowed funds	0	0
Accrued interest payable	$ 0	$ 0