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Note 14 - Regulatory Capital (Details) - Savings Bank [Member]	Jan. 01, 2019	Jan. 01, 2016	Dec. 31, 2015	Dec. 31, 2014
Note 14 - Regulatory Capital (Details) [Line Items]
Common Equity Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets			4.50%
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets			6.00%	4.00%
Capital Required for Capital Adequacy to Risk Weighted Assets			8.00%
Tier One Leverage Capital Required for Capital Adequacy to Average Assets			4.00%
Scenario, Forecast [Member]
Note 14 - Regulatory Capital (Details) [Line Items]
Common Equity Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	7.00%
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	8.50%
Capital Required for Capital Adequacy to Risk Weighted Assets	10.50%
Capital Conservation Buffer Required for Capital Adequacy	2.50%	0.625%

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- Definition

The minimum capital conservation buffer, above the regulatory minimum capital ratios, required for capital adequacy.

+ References

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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.

+ References

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- Definition

The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under 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)
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The minimum amount of Tier 1 Leverage Capital for capital adequacy purposes divided by average assets as defined in the regulations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 505
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The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

+ References

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-Publisher FASB
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