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Note 7 - Investment and Equity Securities - Gross Unrealized Losses and Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Less than Twelve Months, Fair Value	$ 32,647	$ 7,264
Less than Twelve Months, Gross Unrealized Losses	(793)	(81)
Twelve Months or Greater, Fair Value	15,049	15,554
Twelve Months or Greater, Gross Unrealized Losses	(634)	(315)
Total, Fair Value	47,696	22,818
Total, Gross Unrealized Losses	(1,427)	(396)
US Government Agencies Debt Securities [Member]
Less than Twelve Months, Fair Value	495	557
Less than Twelve Months, Gross Unrealized Losses	(13)	(4)
Twelve Months or Greater, Fair Value	3,816	4,036
Twelve Months or Greater, Gross Unrealized Losses	(94)	(67)
Total, Fair Value	4,311	4,593
Total, Gross Unrealized Losses	(107)	(71)
Nontaxable Municipal Bonds [Member]
Less than Twelve Months, Fair Value	27,247	1,009
Less than Twelve Months, Gross Unrealized Losses	(571)	(6)
Twelve Months or Greater, Fair Value	2,713	2,784
Twelve Months or Greater, Gross Unrealized Losses	(99)	(32)
Total, Fair Value	29,960	3,793
Total, Gross Unrealized Losses	(670)	(38)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Less than Twelve Months, Fair Value	4,905	5,698
Less than Twelve Months, Gross Unrealized Losses	(209)	(71)
Twelve Months or Greater, Fair Value	8,520	8,734
Twelve Months or Greater, Gross Unrealized Losses	(441)	(216)
Total, Fair Value	13,425	14,432
Total, Gross Unrealized Losses	$ (650)	$ (287)

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=82897076&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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