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Note 15 - Shareholders' Equity - Summary of Actual Capital Amount and Well Capitalized Total Risk-Based, Tier I Risk-Based, and Tier I Leverage Ratios (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Common equity Tier 1 capital (to risk-weighted assets), Actual Regulatory Capital, Amount	$ 74,383	$ 73,433
Common equity Tier 1 capital (to risk-weighted assets), Actual Regulatory Capital, Ratio	18.41%	19.01%
Common equity Tier 1 capital (to risk-weighted assets), Minimum Requirement	5.75%	5.125%
Common equity Tier 1 capital (to risk-weighted assets), To Be Well Capitalized	6.50%	6.50%
Tier 1 capital (to risk-weighted assets), Actual Regulatory Capital, Amount	$ 74,383	$ 73,433
Tier 1 capital (to risk-weighted assets), Actual Regulatory Capital, Ratio	18.41%	19.01%
Tier 1 capital (to risk-weighted assets), Minimum Requirement	7.25%	6.625%
Tier 1 capital (to risk-weighted assets), To Be Well Capitalized	8.00%	8.00%
Total capital (to risk-weighted assets), Actual Regulatory Capital, Amount	$ 79,157	$ 78,279
Total capital (to risk-weighted assets), Actual Regulatory Capital, Ratio	19.60%	20.26%
Total capital (to risk-weighted assets), Minimum Requirement	9.25%	8.625%
Total capital (to risk-weighted assets), To Be Well Capitalized	10.00%	10.00%
Tier 1 leverage (to average assets), Actual Regulatory Capital, Amount	$ 74,383	$ 73,433
Tier 1 leverage (to average assets), Actual Regulatory Capital, Ratio	11.89%	12.27%
Tier 1 leverage (to average assets), Minimum Requirement	4.00%	4.00%
Tier 1 leverage (to average assets), To Be Well Capitalized	5.00%	5.00%

X

- Definition

The minimum Common Equity Tier 1 Risk Based Capital Ratio (Common Equity Tier 1 Capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

+ References

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The amount of total capital as defined in the regulations.

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Total Capital divided by risk weighted assets as defined in the regulations.

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Amount of Common Equity Tier One Risk-based Capital, as defined by regulatory framework.

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Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital.

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Tier 1 Risk Based Capital as defined in the regulations.

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