Note 14 - Financial Instruments - Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Reported Value Measurement [Member]
Net Loans	$ 566,460	$ 532,970
Time Deposits	191,988	180,143
FHLB Advances	10,000
Estimate of Fair Value Measurement [Member]
Net Loans	557,054	529,155
Time Deposits	192,365	176,188
FHLB Advances	10,021
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Net Loans
Time Deposits
FHLB Advances	10,021
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Net Loans	556,851	528,784
Time Deposits	192,365	176,188
FHLB Advances
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Net Loans	203	371
Time Deposits
FHLB Advances