Note 4 - Investment Securities - Maturities of Debt Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Available for sale, amortized cost, within one year	$ 4,371
Available for sale, fair value, within one year	$ 4,372
Available for sale, weighted average rate, within one year	2.04%
Held to maturity, amortized cost, within one year
Held to maturity, fair value, within one year
Held to maturity, weighted average rate, within one year
Available for sale, amortized cost, due from one year to five years	$ 15,925
Available for sale, fair value, due from one year to five years	$ 15,911
Available for sale, weighted average rate, due from one year to five years	2.23%
Held to maturity, amortized cost, due from one year to five years
Held to maturity, fair value, due from one year to five years
Held to maturity, weighted average rate, due from one year to five years
Available for sale, amortized cost, due from five years to ten years	$ 19,145
Available for sale, fair value, due from five years to ten years	$ 19,517
Available for sale, weighted average rate, due from five years to ten years	3.51%
Held to maturity, amortized cost, due from five years to ten years	$ 6,506
Held to maturity, fair value, due from five years to ten years	$ 6,548
Held to maturity, weighted average rate, due from five years to ten years	2.20%
Available for sale, amortized cost, due after ten years	$ 60,616
Available for sale, fair value, due after ten years	$ 61,328
Available for sale, weighted average rate, due after ten years	2.91%
Held to maturity, amortized cost, due after ten years	$ 36,269
Held to maturity, fair value, due after ten years	$ 36,301
Held to maturity, weighted average rate, due after ten years	2.80%
Available for sale, amortized cost, with maturity dates	$ 100,057
Available for sale, fair value, with maturity dates	$ 101,128
Available for sale, weighted average rate, with maturity dates	2.88%
Held to maturity, amortized cost, with maturity dates	$ 42,775
Held to maturity, fair value, with maturity dates	$ 42,849
Held to maturity, weighted average rate, with maturity dates	2.71%
Available for sale, amortized cost	$ 196,510
Available for sale securities, at fair value	$ 196,806	$ 188,476
Available for sale, weighted average rate	2.65%
Held to maturity securities, at amortized cost (fair value of $42,849 and $25,090, respectively)	$ 42,775	26,977
Held to maturity securities, fair value	$ 42,849	25,090
Held to maturity, weighted average rate	2.71%
Collateralized Mortgage Backed Securities [Member]
Available for sale, amortized cost, without maturity dates	$ 96,453
Available for sale, fair value, without maturity dates	$ 95,678
Available for sale, weighted average rate, without maturity dates	2.41%
Held to maturity, amortized cost, without maturity dates
Held to maturity, fair value, without maturity dates
Held to maturity, weighted average rate, without maturity dates
Available for sale securities, at fair value	$ 95,678	$ 95,795

The weighted average rate of available-for-sale securities which are due after ten years.

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The weighted average rate of available-for-sale securities which are due from one year to five years.

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No definition available.

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The weighted average rate of available for sale securities which are due within one year.

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The weighted average rate of available-for-sale securities which are due after ten years.

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The weighted average rate of available-for-sale securities which are due from five years to ten years.

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The total weighted average rate of available-for-sale securities.

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This item represents the cost of debt 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.

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

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing after the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing after the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of investment in available-for-sale debt securities with a single maturity date.

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Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, maturing after the tenth fiscal year following the latest fiscal year.

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- Definition

Amount of investment in held-to-maturity debt securities with a single maturity date, after other than temporary impairment (OTTI) accretion.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

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Fair value of investment in held-to-maturity debt securities with a single maturity date.

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- Definition

Fair value of held-to-maturity debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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- Definition

Amount of held-to-maturity debt securities at fair value that do not have a single maturity date and which the entity has decided to disclose separately rather than allocating the fair value over several maturity groupings.

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- Definition

Fair value of investments in debt securities classified as held-to-maturity.

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