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Note 10 - Fair Value of Financial Instruments - Financial Assets and Liabilities Reported Under the Fair Value Option (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Financial Assets at Fair Value Option		$ 14,100		$ 14,300
Net loss from fair value adjustments		(100)	$ (378)
Collateralized Mortgage Backed Securities [Member]
Financial Assets at Fair Value Option		1,505		1,590
Net loss from fair value adjustments		(11)	(7)
Other Securities [Member]
Financial Assets at Fair Value Option		12,612		12,685
Net loss from fair value adjustments		(138)	32
Junior Subordinated Debentures [Member]
Financial Assets at Fair Value Option		38,692		$ 36,986
Net loss from fair value adjustments		(1,681)	(570)
Financial Assets and Liabilities, Excluding Interest Rate Caps / Swaps [Member]
Net loss from fair value adjustments	[1]	$ (1,830)	$ (545)
[1] The net loss from fair value adjustments presented in the above table does not include net gains of $1.7 million and $0.2 million for the three months ended March 31, 2018 and 2017, respectively, from the change in the fair value of interest rate swaps.

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- Definition

The fair value option of financial assets.

+ References

No definition available.

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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

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