Note 9 - Fair Value of Financial Instruments - Financial Assets and Liabilities Reported Under the Fair Value Option (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Financial Assets at Fair Value Option		$ 21,400		$ 21,400		$ 30,400
Net loss from fair value adjustments		(1,297)	$ (823)	(2,834)	$ (2,925)
Collateralized Mortgage Backed Securities [Member]
Financial Assets at Fair Value Option		1,696		1,696		2,016
Net loss from fair value adjustments		(5)	(6)	(15)	(4)
Other Securities [Member]
Financial Assets at Fair Value Option		19,712		19,712		28,429
Net loss from fair value adjustments		40	(30)	184	156
Junior Subordinated Debentures [Member]
Financial Assets at Fair Value Option		36,071		36,071		$ 33,959
Net loss from fair value adjustments		(925)	(296)	(2,090)	1,250
Financial Assets and Liabilities, Excluding Interest Rate Caps / Swaps [Member]
Net loss from fair value adjustments	[1],[2]	$ (890)	$ (332)	$ (1,921)	$ 1,402

[1] The net gain (loss) from fair value adjustments presented in the above table does not include net losses of $0.4 million and $0.5 million for the three months ended September 30, 2017 and 2016, respectively, from the change in the fair value of interest rate swaps.

[2] The net gain (loss) from fair value adjustments presented in the above table does not include net losses of $0.9 million and $4.3 million for the nine months ended September 30, 2017 and 2016, respectively, from the change in the fair value of interest rate swaps.