Note 6 - Investment Securities - The Amortized Costs and Estimated Fair Value of the Securities Portfolio (Details) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
US Government-sponsored Enterprises Debt Securities [Member]
Available for Sale Securities - Amortized Cost	$ 127,090,000	$ 107,135,000
Available for Sale Securities - Gross Unrealized Gains	1,098,000	309,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	1,000	538,000
Available-for-sale Securities	128,187,000	106,906,000
US States and Political Subdivisions Debt Securities [Member]
Available for Sale Securities - Amortized Cost	129,594,000	147,875,000
Available for Sale Securities - Gross Unrealized Gains	3,314,000	2,604,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	25,000	213,000
Available-for-sale Securities	132,883,000	150,266,000
Held to Maturity Securities - Amortized Cost	3,585,000	3,611,000
Held to Maturity Securities - Gross Unrealized Gains	246,000	198,000
Held to Maturity Securities - Gross Unrealized Losses	0	0
Held to Maturity Securities - Estimated Fair Value	3,831,000	3,809,000
Residential Mortgage Backed Securities [Member]
Available for Sale Securities - Amortized Cost	279,691,000	294,140,000
Available for Sale Securities - Gross Unrealized Gains	7,788,000	5,210,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	88,000	1,489,000
Available-for-sale Securities	287,391,000	297,861,000
Commercial Mortgage Backed Securities [Member]
Available for Sale Securities - Amortized Cost	24,890,000	20,655,000
Available for Sale Securities - Gross Unrealized Gains	433,000	52,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	123,000
Available-for-sale Securities	25,323,000	20,584,000
Corporate Debt Securities [Member]
Available for Sale Securities - Amortized Cost	6,815,000	6,629,000
Available for Sale Securities - Gross Unrealized Gains	13,000	11,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	963,000	800,000
Available-for-sale Securities	5,865,000	5,840,000
Mutual Funds and Equity Securities [Member]
Available for Sale Securities - Amortized Cost	804,000	814,000
Available for Sale Securities - Gross Unrealized Gains	8,000	0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	14,000	69,000
Available-for-sale Securities	798,000	745,000
Available for Sale Securities - Amortized Cost	568,884,000	577,248,000
Available for Sale Securities - Gross Unrealized Gains	12,654,000	8,186,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	1,091,000	3,232,000
Available-for-sale Securities	580,447,000	582,202,000
Held to Maturity Securities - Amortized Cost	3,585,000	3,611,000
Held to Maturity Securities - Estimated Fair Value	$ 3,831,000	$ 3,809,000

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Subparagraph (c)
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Section 25
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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-Section S99
-Paragraph 1
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Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity.

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

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