Note 15 - Regulatory Capital Ratios (Details Textual) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Dec. 31, 2016	Mar. 31, 2017	Jan. 01, 2019	Mar. 31, 2016
Common Equity Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets		6.50%		6.50%
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets		8.00%		8.00%
Capital Conservation Buffer Phase In Period		4 years
Capital Required to be Well Capitalized to Risk Weighted Assets		10.00%		10.00%
Tier One Leverage Capital Required to be Well Capitalized to Average Assets		5.00%		5.00%
Capital Conservation Buffer Level R Ratio		0.625%
Increase (Decrease) in Capital	$ 3
Scenario, Forecast [Member]
Capital Conservation Buffer Level R Ratio			2.50%

The Capital Conservation Buffer level ratio required for capital adequacy purposes under the Basel III Capital Rules.

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- Definition

Represents the phase in period related to capital conservation.

+ References

No definition available.

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- Definition

The Common Equity Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action.

+ References

No definition available.

+ Details

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- Definition

The amount increase (decrease) of total capital as defined in the regulations.

+ References

No definition available.

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- Definition

The Total risk based capital ratio (total capital divided by risk weighted assets) required to be categorized as "well capitalized", in the regulatory framework for prompt corrective action.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826

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- Definition

The amount of Tier 1 Leverage Capital required to be categorized as well capitalized divided by average assets as defined in the regulatory framework for prompt corrective action.

+ References

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- Definition

The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action.

+ References

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