Note 7 - Regulatory Capital Requirements (Details Textual)	3 Months Ended
Mar. 31, 2018
Annual Phase in Percentage Of Capital Conservation Buffer	0.625%
Capital Required for Capital Adequacy to Risk Weighted Assets with Capital Conservation Buffer Fully Phased in	10.50%
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets with Capital Conservation Buffer Fully Phased in	8.50%
Common Equity Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets with Capital Conservation Buffer Fully Phased in	7.00%

The minimum Common Equity Tier One Capital Ratio (Common Equity Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action, plus the fully phased-in capital conservation buffer of 2.5%.

No definition available.

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