Note 7 - Fair Value - Carrying Amount and Fair Value of Financial Instruments Included in the Consolidated Balance Sheet (Details) - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Debt securities, fair value	$ 151,139,000	$ 186,270,000
Securities - equities	3,000	5,000
Loans held for sale	0	469,000
Federal bank stock	5,527,000	5,715,000
Fair Value, Inputs, Level 1 [Member]
Debt securities, fair value	0	0
Securities - equities	3,000	5,000
Fair Value, Inputs, Level 2 [Member]
Debt securities, fair value	146,554,000	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	11,654,000	9,080,000
Interest earning time deposits	1,490,000	2,484,000
Debt securities, fair value	151,139,000	186,270,000
Securities - equities	3,000	5,000
Loans held for sale	0	469,000
Loans, net	800,151,000	780,010,000
Federal bank stock	5,527,000	5,715,000
Accrued interest receivable	3,563,000	3,731,000
Deposits	937,581,000	918,496,000
Borrowed funds	18,000,000	22,050,000
Accrued interest payable	313,000	338,000
Estimate of Fair Value Measurement [Member]
Cash and cash equivalents	11,654,000	9,080,000
Interest earning time deposits	1,490,000	2,484,000
Debt securities, fair value	151,139,000	186,270,000
Securities - equities	3,000	5,000
Loans held for sale	0	469,000
Loans, net	765,615,000	780,086,000
Accrued interest receivable	3,563,000	3,731,000
Deposits	939,494,000	921,811,000
Borrowed funds	18,000,000	22,121,000
Accrued interest payable	313,000	338,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	11,654,000	9,080,000
Interest earning time deposits	0	0
Debt securities, fair value	0	0
Securities - equities	3,000	5,000
Loans held for sale	0	0
Loans, net	0	0
Accrued interest receivable	33,000	35,000
Deposits	798,263,000	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	1,490,000	2,484,000
Debt securities, fair value	146,554,000	182,685,000
Securities - equities	0	0
Loans held for sale	0	469,000
Loans, net	0	0
Accrued interest receivable	783,000	817,000
Deposits	141,231,000	153,971,000
Borrowed funds	18,000,000	22,121,000
Accrued interest payable	309,000	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	765,615,000	780,086,000
Accrued interest receivable	2,747,000	2,879,000
Deposits	0	0
Borrowed funds	0	0
Accrued interest payable	$ 0	$ 0