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Note 7 - Investment and Equity Securities - Amortized Cost and Fair Values of Securities Available for Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Amortized cost	$ 97,302	$ 98,516
Gross unrealized gains	1,288	855
Gross unrealized losses	(476)	(1,049)
Investment securities available for sale, at fair value	98,114	98,322
US Government Agencies Debt Securities [Member]
Amortized cost	7,120	7,442
Gross unrealized gains	111	90
Gross unrealized losses	(49)	(61)
Investment securities available for sale, at fair value	7,182	7,471
Taxable Municipal Bonds [Member]
Amortized cost	501	502
Gross unrealized gains	8	10
Gross unrealized losses
Investment securities available for sale, at fair value	509	512
Nontaxable Municipal Bonds [Member]
Amortized cost	69,233	72,387
Gross unrealized gains	1,057	667
Gross unrealized losses	(64)	(473)
Investment securities available for sale, at fair value	70,226	72,581
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Amortized cost	20,448	18,185
Gross unrealized gains	112	88
Gross unrealized losses	(363)	(515)
Investment securities available for sale, at fair value	$ 20,197	$ 17,758

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563

+ Details

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Balance Type:	credit
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X

- Definition

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

No definition available.

+ Details

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X

- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

No definition available.

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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