Note 10 - Financial Instruments - Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Reported Value Measurement [Member]
Net Loans	$ 680,567	$ 659,195
Time Deposits	197,712	194,419
FHLB Advances	10,000	10,000
Time Deposits	197,712	194,419
Estimate of Fair Value Measurement [Member]
Net Loans	676,591	653,454
Time Deposits	197,276	196,522
FHLB Advances	9,863	9,765
Time Deposits	197,276	196,522
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Net Loans	0	0
Time Deposits	0	0
FHLB Advances	9,863	9,765
Time Deposits	0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Net Loans	676,402	653,255
Time Deposits	197,276	196,522
FHLB Advances	0	0
Time Deposits	197,276	196,522
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Net Loans	189	199
Time Deposits	0	0
FHLB Advances	0	0
Time Deposits	$ 0	$ 0