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Note 4 - Debt and Equity Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Corporate Debt Securities [Member] |  |
Amortized Cost | $ 110,000,000 | $ 115,976,000
Fair Value | 104,011,000 | 111,674,000
Gross Unrealized Gains | 191,000 | 134,000
Gross Unrealized Losses | 6,180,000 | 4,436,000
Municipal Debt Securities [Member] |  |
Amortized Cost | 33,274,000 | 6,180,000
Fair Value | 33,410,000 | 6,180,000
Gross Unrealized Gains | 136,000 |
Gross Unrealized Losses |  |
Amortized Cost | 125,667,000 | 127,696,000
Fair Value | 130,380,000 | 131,583,000
Gross Unrealized Gains | 4,713,000 | 3,887,000
Gross Unrealized Losses |  |
Mutual Fund Debt Securities [Member] |  |
Amortized Cost | 21,658,000 | 21,290,000
Fair Value | 21,658,000 | 21,290,000
Gross Unrealized Gains |  |
Gross Unrealized Losses |  |
Collateralized Debt Obligations [Member] |  |
Amortized Cost | 101,660,000 | 53,225,000
Fair Value | 102,572,000 | 52,898,000
Gross Unrealized Gains | 920,000 |
Gross Unrealized Losses | 8,000 | 327,000
Other Debt Obligations [Member] |  |
Amortized Cost | 7,193,000 | 7,214,000
Fair Value | 7,191,000 | 7,212,000
Gross Unrealized Gains |  |
Gross Unrealized Losses | 2,000 | 2,000
Available for Sale Securities Excluding Mortgage Backed Securities [Member] |  |
Amortized Cost | 366,178,000 | 325,401,000
Fair Value | 365,812,000 | 324,657,000
Gross Unrealized Gains | 5,824,000 | 4,021,000
Gross Unrealized Losses | 6,190,000 | 4,765,000
REMIC and CMO [Member] |  |
Amortized Cost | 383,912,000 | 469,987,000
Fair Value | 389,426,000 | 469,936,000
Gross Unrealized Gains | 6,144,000 | 3,096,000
Gross Unrealized Losses | 630,000 | 3,147,000
GNMA [Member] |  |
Amortized Cost | 7,520,000 | 11,635,000
Fair Value | 7,700,000 | 11,798,000
Gross Unrealized Gains | 180,000 | 302,000
Gross Unrealized Losses |  | 139,000
FNMA [Member] |  |
Amortized Cost | 129,791,000 | 170,327,000
Fair Value | 132,831,000 | 170,057,000
Gross Unrealized Gains | 3,085,000 | 1,492,000
Gross Unrealized Losses | 45,000 | 1,762,000
FHLMC [Member] |  |
Amortized Cost | 14,802,000 | 16,961,000
Fair Value | 15,110,000 | 16,949,000
Gross Unrealized Gains | 308,000 | 87,000
Gross Unrealized Losses |  | 99,000
Collateralized Mortgage Backed Securities [Member] |  |
Amortized Cost | 536,025,000 | 668,910,000
Fair Value | 545,067,000 | 668,740,000
Gross Unrealized Gains | 9,717,000 | 4,977,000
Gross Unrealized Losses | 675,000 | 5,147,000
Amortized Cost | 33,274,000 | 6,180,000
Fair Value | 33,410,000 | 6,180,000
Gross Unrealized Gains | 136,000 |
Gross Unrealized Losses |  |
Amortized Cost | 902,203,000 | 994,311,000
Fair Value | 910,879,000 | 993,397,000
Gross Unrealized Gains | 15,541,000 | 8,998,000
Gross Unrealized Losses | $ 6,865,000 | $ 9,912,000

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- Definition 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 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + 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 + Details
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