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Note 7 - Investment and Equity Securities - Gross Unrealized Losses and Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Less than Twelve Months, Fair Value		$ 22,519
Less than Twelve Months, Gross Unrealized Losses		(295)
Twelve Months or Greater, Fair Value	11,274	27,415
Twelve Months or Greater, Gross Unrealized Losses	(119)	(754)
Total, Fair Value	11,274	49,934
Total, Gross Unrealized Losses	(119)	(1,049)
US Government Agencies Debt Securities [Member]
Less than Twelve Months, Fair Value
Less than Twelve Months, Gross Unrealized Losses
Twelve Months or Greater, Fair Value	1,999	4,105
Twelve Months or Greater, Gross Unrealized Losses	(1)	(61)
Total, Fair Value	1,999	4,105
Total, Gross Unrealized Losses	(1)	(61)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Less than Twelve Months, Fair Value		2,068
Less than Twelve Months, Gross Unrealized Losses		(9)
Twelve Months or Greater, Fair Value	9,275	12,257
Twelve Months or Greater, Gross Unrealized Losses	(118)	(506)
Total, Fair Value	9,275	14,325
Total, Gross Unrealized Losses	$ (118)	(515)
Nontaxable Municipal Bonds [Member]
Less than Twelve Months, Fair Value		20,451
Less than Twelve Months, Gross Unrealized Losses		(286)
Twelve Months or Greater, Fair Value		11,053
Twelve Months or Greater, Gross Unrealized Losses		(187)
Total, Fair Value		31,504
Total, Gross Unrealized Losses		$ (473)

X

- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

+ References

No definition available.

+ Details

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X

- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563

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- Definition

This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

+ References

No definition available.

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- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months.

+ References

No definition available.

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- Definition

This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.

+ References

No definition available.

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- Definition

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+ References

No definition available.

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