Note 20 - Regulatory Matters - Company and Bank's Actual Capital Amounts and Ratios (Details) - USD ($)		Dec. 31, 2018		Dec. 31, 2017		Jul. 31, 2013
Total capital (to Risk- Weighted Assets), Amount		$ 104,613		$ 94,354
Total capital (to Risk- Weighted Assets), Ratio		11.80%		11.30%
Total capital (to Risk- Weighted Assets), Adequately capitalized threshold, Amount	[1]	$ 87,699		$ 77,119
Total capital (to Risk- Weighted Assets), Adequately capitalized threshold, Ratio	[1]	987.50%		925.00%
Tier I capital (to Risk- Weighted Assets), Amount		$ 95,532		$ 85,883
Tier I capital (to Risk- Weighted Assets), Ratio		10.80%		10.30%
Tier I capital (to Risk- Weighted Assets), Adequately capitalized threshold, Amount	[1]	$ 69,937		$ 60,445
Tier I capital (to Risk- Weighted Assets), Adequately capitalized threshold, Ratio		7.875%	[1]	7.25%	[1]	6.00%
Common Equity Tier 1 Capital (to Risk Weighted Assets), Amount		$ 95,532		$ 85,883
Common Equity Tier 1 Capital (to Risk Weighted Assets), Ratio		10.80%		10.30%
Common Equity Tier 1 Capital (to Risk Weighted Assets), Adequately capitalized threshold, Amount	[1]	$ 56,616		$ 47,939
Common Equity Tier 1 Capital (to Risk Weighted Assets), Adequately capitalized threshold, Ratio		6.375%	[1]	5.75%	[1]	4.50%
Tier I capital (to Average Assets), Amount		$ 95,532		$ 85,883
Tier I capital (to Average Assets), Ratio		8.80%		8.40%
Tier I capital (to Average Assets), Adequately capitalized threshold, Amount	[1]	$ 43,667		$ 40,823
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		$ 104,253,000		$ 93,933
Total capital (to Risk- Weighted Assets), Ratio		11.70%		11.30%
Total capital (to Risk- Weighted Assets), Adequately capitalized threshold, Amount	[1]	$ 87,691,000		$ 77,102
Total capital (to Risk- Weighted Assets), Adequately capitalized threshold, Ratio	[1]	9.875%		9.25%
Total capital (to Risk- Weighted Assets), To be well capitalized under prompt corrective action provisions, Amount		$ 88,801,000		$ 83,354
Total capital (to Risk- Weighted Assets), To be well capitalized under prompt corrective action provisions, Ratio		10.00%		10.00%
Tier I capital (to Risk- Weighted Assets), Amount		$ 95,172,000		$ 85,462
Tier I capital (to Risk- Weighted Assets), Ratio		10.70%		10.30%
Tier I capital (to Risk- Weighted Assets), Adequately capitalized threshold, Amount	[1]	$ 69,931,000		$ 60,431
Tier I capital (to Risk- Weighted Assets), Adequately capitalized threshold, Ratio	[1]	7.875%		7.25%
Tier I capital (to Risk- Weighted Assets), To be well capitalized under prompt corrective action provisions, Amount		$ 71,041,000		$ 66,683
Tier I capital (to Risk- Weighted Assets), To be well capitalized under prompt corrective action provisions, Ratio		8.00%		8.00%
Common Equity Tier 1 Capital (to Risk Weighted Assets), Amount		$ 95,172,000		$ 85,462
Common Equity Tier 1 Capital (to Risk Weighted Assets), Ratio		10.70%		10.30%
Common Equity Tier 1 Capital (to Risk Weighted Assets), Adequately capitalized threshold, Amount	[1]	$ 56,611		$ 47,928
Common Equity Tier 1 Capital (to Risk Weighted Assets), Adequately capitalized threshold, Ratio	[1]	6.375%		5.75%
Common Equity Tier 1 Capital (to Risk Weighted Assets), To be well capitalized under prompt corrective action provisions, Amount		$ 57,721		$ 54,180
Common Equity Tier 1 Capital (to Risk Weighted Assets), To be well capitalized under prompt corrective action provisions, Ratio		6.50%		6.50%
Tier I capital (to Average Assets), Amount		$ 95,172		$ 85,462
Tier I capital (to Average Assets), Ratio		8.70%		8.40%
Tier I capital (to Average Assets), Adequately capitalized threshold, Amount	[1]	$ 43,665		$ 40,820
Tier I capital (to Average Assets), Adequately capitalized threshold, Ratio	[1]	4.00%		4.00%
Tier I capital (to Average Assets), To be well capitalized under prompt corrective action provisions, Amount		$ 54,581		$ 51,025
Tier I capital (to Average Assets), To be well capitalized under prompt corrective action provisions, Ratio		5.00%		5.00%

[1] The adequately capitalized thresholds in the table above, includes the capital conservation buffers of 1.875% in 2018 and 1.25% in 2017, that became effective January 1, 2016. These ratios are not reflected on a fully phased-in basis, which occured in January 2019.