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Note 18 - Fair Value of Financial Instruments - Financial Assets and Liabilities Reported Under the Fair Value Option (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Financial Assets at Fair Value Option |  | $ 13,800 | $ 14,300 |
Net loss from fair value adjustments |  | (4,122) | (3,465) | $ (3,434)
Collateralized Mortgage Backed Securities [Member] |  |  |  |
Financial Assets at Fair Value Option |  | 967 | 1,590 |
Net loss from fair value adjustments |  | (19) | (26) | (25)
Other Securities [Member] |  |  |  |
Financial Assets at Fair Value Option |  | 12,843 | 12,685 |
Net loss from fair value adjustments |  | (109) | 134 | (38)
Junior Subordinated Debentures [Member] |  |  |  |
Financial Assets at Fair Value Option |  | 41,849 | 36,986 |
Net loss from fair value adjustments |  | (4,913) | (2,993) | (4,908)
Financial Assets and Liabilities, Excluding Interest Rate Caps / Swaps [Member] |  |  |  |
Net loss from fair value adjustments | [1] | $ (5,041) | $ (2,885) | $ (4,971)
[1] | The net loss from fair value adjustments presented in the above table does not include net gains (losses) of $0.9 million, ($0.6) million and $1.5 million from the change in fair value of derivative instruments during the years ended December 31, 2018, 2017 and 2016, respectively.

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- Definition The fair value option of financial assets. + References No definition available. + Details
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- Definition For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 + Details
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