Note 12 - Financial Instruments - Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Reported Value Measurement [Member]
Net Loans	$ 659,195	$ 566,460
Time Deposits	194,419	191,988
FHLB Advances	10,000	10,000
Time Deposits	194,419	191,988
Estimate of Fair Value Measurement [Member]
Net Loans	653,454	557,054
Time Deposits	196,522	192,365
FHLB Advances	9,765	10,021
Time Deposits	196,522	192,365
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Net Loans
Time Deposits
FHLB Advances	9,765	10,021
Time Deposits
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Net Loans	653,255	556,851
Time Deposits	196,522	192,365
FHLB Advances
Time Deposits	196,522	192,365
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Net Loans	199	203
Time Deposits
FHLB Advances
Time Deposits