Note 11 - Fair Value of Financial Instruments - Financial Assets and Liabilities Reported Under the Fair Value Option (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Financial Assets at Fair Value Option		$ 14,000		$ 13,800
Net loss from fair value adjustments		(2,080)	$ (100)
Collateralized Mortgage Backed Securities [Member]
Financial Assets at Fair Value Option		934		967
Net loss from fair value adjustments		1	(11)
Other Securities [Member]
Financial Assets at Fair Value Option		13,091		12,843
Net loss from fair value adjustments		179	(138)
Junior Subordinated Debentures [Member]
Financial Assets at Fair Value Option		42,941		$ 41,849
Net loss from fair value adjustments		(1,210)	(1,681)
Financial Assets and Liabilities, Excluding Interest Rate Caps / Swaps [Member]
Net loss from fair value adjustments	[1]	$ (1,030)	$ (1,830)

[1] The net loss from fair value adjustments presented in the above table does not include net (losses) gains of ($1.1) million and $1.7 million for the three months ended March 31, 2019 and 2018, respectively, from the change in the fair value of interest rate swaps.