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Note 5 - Investment Securities Available For Sale (Detail) - Gross Unrealized Losses and Fair Value (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
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Securities in Continuous Unrealized Loss Position Less than Twelve Months Fair Value | $ 9,600 | $ 15,313
Securities in Continuous Unrealized Loss Position Less than Twelve Months Gross Unrealized Losses | (44) | (150)
Securities in Continuous Unrealized Loss Position Twelve Months or Greater Fair Value | 647 | 1,317
Securities in Continuous Unrealized Loss Position Twelve Months or Greater Gross Unrealized Losses | (46) | (74)
Securities in Continuous Unrealized Loss Position Fair Value | 10,247 | 16,630
Securities in Continuous Unrealized Loss Position Gross Unrealized Losses | (90) | (224)
US States and Political Subdivisions Debt Securities [Member] |  |
Securities in Continuous Unrealized Loss Position Less than Twelve Months Fair Value | 742 | 2,707
Securities in Continuous Unrealized Loss Position Less than Twelve Months Gross Unrealized Losses | (12) | (40)
Securities in Continuous Unrealized Loss Position Twelve Months or Greater Fair Value | 289 | 919
Securities in Continuous Unrealized Loss Position Twelve Months or Greater Gross Unrealized Losses | (11) | (21)
Securities in Continuous Unrealized Loss Position Fair Value | 1,031 | 3,626
Securities in Continuous Unrealized Loss Position Gross Unrealized Losses | (23) | (61)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Securities in Continuous Unrealized Loss Position Less than Twelve Months Fair Value | 8,523 | 8,992
Securities in Continuous Unrealized Loss Position Less than Twelve Months Gross Unrealized Losses | (26) | (54)
Securities in Continuous Unrealized Loss Position Fair Value | 8,523 | 8,992
Securities in Continuous Unrealized Loss Position Gross Unrealized Losses | (26) | (54)
Mortgage-backed Securities, Issued by Private Enterprises [Member] |  |
Securities in Continuous Unrealized Loss Position Less than Twelve Months Fair Value | 335 | 1,628
Securities in Continuous Unrealized Loss Position Less than Twelve Months Gross Unrealized Losses | (6) | (42)
Securities in Continuous Unrealized Loss Position Twelve Months or Greater Fair Value | 358 | 398
Securities in Continuous Unrealized Loss Position Twelve Months or Greater Gross Unrealized Losses | (35) | (53)
Securities in Continuous Unrealized Loss Position Fair Value | 693 | 2,026
Securities in Continuous Unrealized Loss Position Gross Unrealized Losses | (41) | (95)
US Government Agencies Debt Securities [Member] |  |
Securities in Continuous Unrealized Loss Position Less than Twelve Months Fair Value |  | 1,986
Securities in Continuous Unrealized Loss Position Less than Twelve Months Gross Unrealized Losses |  | (14)
Securities in Continuous Unrealized Loss Position Fair Value |  | 1,986
Securities in Continuous Unrealized Loss Position Gross Unrealized Losses |  | $ (14)

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- Definition Amount of the excess of amortized cost basis over fair value of securities that have been in a loss position for twelve months or longer for securities which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition Amount of the excess of amortized cost basis over fair value of securities in a loss position and categorized neither as held-to-maturity nor trading securities. + References 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=6872113&loc=d3e27290-111563 + Details
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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 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)(1) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Amount of the excess of amortized cost basis over fair value of securities that have been in a loss position for less than twelve months for securities categorized neither as held-to-maturity nor trading securities. + References 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=6872113&loc=d3e27290-111563 Reference 2: 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=6872113&loc=d3e27337-111563 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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=6872113&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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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 twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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=6872113&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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