Note 4 - Investments - Available-for-sale Securities in Unrealized Loss Positions (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
US Government Agencies Debt Securities [Member]
Less than 12 months, fair value	$ 126
Less than 12 months, unrealized losses	(1)
Greater than 12 months, fair value	1,330	$ 1,319
Greater than 12 months, unrealized losses	(4)	(16)
Fair value	1,456	1,319
Unrealized losses	(5)	(16)
US States and Political Subdivisions Debt Securities [Member]
Less than 12 months, fair value	8,435	552
Less than 12 months, unrealized losses	$ (173)	(1)
Greater than 12 months, fair value		825
Greater than 12 months, unrealized losses		(3)
Fair value	$ 8,435	1,377
Unrealized losses	(173)	(4)
Corporate Debt Securities [Member]
Less than 12 months, fair value	14,865	18,835
Less than 12 months, unrealized losses	(94)	(98)
Greater than 12 months, fair value	862	489
Greater than 12 months, unrealized losses	(11)	(8)
Fair value	15,727	19,324
Unrealized losses	(105)	(106)
Commercial Mortgage and Asset-backed [Member]
Less than 12 months, fair value	21,143	12,060
Less than 12 months, unrealized losses	(231)	(34)
Greater than 12 months, fair value	1,074	4,999
Greater than 12 months, unrealized losses	(45)	(83)
Fair value	22,217	17,059
Unrealized losses	(276)	(117)
Debt Securities [Member]
Less than 12 months, fair value	44,569	31,447
Less than 12 months, unrealized losses	(499)	(133)
Greater than 12 months, fair value	3,266	7,632
Greater than 12 months, unrealized losses	(60)	(110)
Fair value	47,835	39,079
Unrealized losses	(559)	(243)
Common Stock [Member]
Less than 12 months, fair value	659	347
Less than 12 months, unrealized losses	$ (57)	$ (39)
Greater than 12 months, fair value
Greater than 12 months, unrealized losses
Fair value	$ 659	$ 347
Unrealized losses	(57)	(39)
Less than 12 months, fair value	45,228	31,794
Less than 12 months, unrealized losses	(556)	(172)
Greater than 12 months, fair value	3,266	7,632
Greater than 12 months, unrealized losses	(60)	(110)
Fair value	48,494	39,426
Unrealized losses	$ (616)	$ (282)

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 6

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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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://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

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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.

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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.

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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-Section 50

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-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

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