Note 19 - Regulatory Matters - Company and Bank's Actual Capital Amounts and Ratios (Details) - USD ($) $ in Thousands		Dec. 31, 2019		Dec. 31, 2018		Jul. 31, 2013
Total capital (to Risk- Weighted Assets), Amount		$ 115,910		$ 104,613
Total capital (to Risk- Weighted Assets), Ratio		12.40%		11.80%
Total capital (to Risk- Weighted Assets), Adequately capitalized threshold, Amount	[1]	$ 98,428		$ 87,699
Total capital (to Risk- Weighted Assets), Adequately capitalized threshold, Ratio		10.50%	[1]	9.875%	[1]	8.00%
Tier I capital (to Risk- Weighted Assets), Amount		$ 106,337		$ 95,532
Tier I capital (to Risk- Weighted Assets), Ratio		11.30%		10.80%
Tier I capital (to Risk- Weighted Assets), Adequately capitalized threshold, Amount	[1]	$ 79,680		$ 69,937
Tier I capital (to Risk- Weighted Assets), Adequately capitalized threshold, Ratio		8.50%	[1]	7.875%	[1]	6.00%
Common Equity Tier 1 Capital (to Risk Weighted Assets), Amount		$ 106,337		$ 95,532
Common Equity Tier 1 Capital (to Risk Weighted Assets), Ratio		11.30%		10.80%
Common Equity Tier 1 Capital (to Risk Weighted Assets), Adequately capitalized threshold, Amount	[1]	$ 65,619		$ 56,616
Common Equity Tier 1 Capital (to Risk Weighted Assets), Adequately capitalized threshold, Ratio		7.00%	[1]	6.375%	[1]	4.50%
Tier I capital (to Average Assets), Amount		$ 106,337		$ 95,532
Tier I capital (to Average Assets), Ratio		9.50%		8.80%
Tier I capital (to Average Assets), Adequately capitalized threshold, Amount	[1]	$ 44,951		$ 43,667
Tier I capital (to Average Assets), Adequately capitalized threshold, Ratio		4.00%	[1]	4.00%	[1]	4.00%
Bank [Member]
Total capital (to Risk- Weighted Assets), Amount		$ 115,713		$ 104,253
Total capital (to Risk- Weighted Assets), Ratio		12.30%		11.70%
Total capital (to Risk- Weighted Assets), Adequately capitalized threshold, Amount	[1]	$ 98,423		$ 87,691
Total capital (to Risk- Weighted Assets), Adequately capitalized threshold, Ratio	[1]	10.50%		9.875%
Tier I capital (to Risk- Weighted Assets), Amount		$ 106,140		$ 95,172
Tier I capital (to Risk- Weighted Assets), Ratio		11.30%		10.70%
Tier I capital (to Risk- Weighted Assets), Adequately capitalized threshold, Amount	[1]	$ 79,676		$ 69,931
Tier I capital (to Risk- Weighted Assets), Adequately capitalized threshold, Ratio	[1]	8.50%		7.875%
Common Equity Tier 1 Capital (to Risk Weighted Assets), Amount		$ 106,140		$ 95,172
Common Equity Tier 1 Capital (to Risk Weighted Assets), Ratio		11.30%		10.70%
Common Equity Tier 1 Capital (to Risk Weighted Assets), Adequately capitalized threshold, Amount	[1]	$ 65,615		$ 56,611
Common Equity Tier 1 Capital (to Risk Weighted Assets), Adequately capitalized threshold, Ratio	[1]	7.00%		6.375%
Tier I capital (to Average Assets), Amount		$ 106,140		$ 95,172
Tier I capital (to Average Assets), Ratio		9.50%		8.70%
Tier I capital (to Average Assets), Adequately capitalized threshold, Amount	[1]	$ 44,948		$ 43,665
Tier I capital (to Average Assets), Adequately capitalized threshold, Ratio	[1]	4.00%		4.00%

[1] The adequately capitalized thresholds in the table above are reflected on a fully phased-in basis, which occurred in January 2019.