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Note 3 - Debt Securities (Details Textual) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Proceeds from (Payments for) in Securities Sold under Agreements to Repurchase		$ (27,769)	$ (716)	$ (67,919)
Number of Securities in Unrealized Loss Position		17	90
Percentage of Combined Depreciation of Combined Reported Value of Aggregate Securities Portfolio		0.10%	0.74%
Number of Securities in Unrealized Loss Position, Greater than or Equal to One Year		10
Security Owned and Pledged as Collateral, Fair Value, Total		$ 27,870	$ 38,250
Wholesale Repurchase Agreements [Member]
Proceeds from (Payments for) in Securities Sold under Agreements to Repurchase	$ 25,000

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- Definition

Represents the number of securities in unrealized loss position.

+ References

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Number of investment positions that have been in a continuous unrealized loss position for greater than or equal to a year.

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- Definition

Represents the percentage of combined depreciation of combined reported value of aggregate securities portfolio.

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- Definition

The cash flow from investments sold under the agreement to repurchase such investment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 9
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- Definition

Fair value of financial instrument held by the entity for its own account (proprietary securities) for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
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