Note 11 - Fair Value of Financial Instruments - Financial Assets and Liabilities Reported Under the Fair Value Option (Details) - USD ($)		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Financial Assets at Fair Value Option		$ 14,200,000		$ 14,200,000		$ 13,800,000
Net loss from fair value adjustments		(1,956,000)	$ (267,000)	(4,036,000)	$ (367,000)
Collateralized Mortgage Backed Securities [Member]
Financial Assets at Fair Value Option		848,000		848,000		967,000
Net loss from fair value adjustments		1,000	0	2,000	(11,000)
Other Securities [Member]
Financial Assets at Fair Value Option		13,346,000		13,346,000		12,843,000
Net loss from fair value adjustments		184,000	(62,000)	363,000	(200,000)
Junior Subordinated Debentures [Member]
Financial Assets at Fair Value Option		43,414,000		43,414,000		$ 41,849,000
Net loss from fair value adjustments		(544,000)	(867,000)	(1,754,000)	(2,548,000)
Financial Assets and Liabilities, Excluding Interest Rate Caps / Swaps [Member]
Net loss from fair value adjustments	[1],[2]	$ (359,000)	$ (929,000)	$ (1,389,000)	$ (2,759,000)

[1] The net loss from fair value adjustments presented in the above table does not include net (losses) gains of ($1.6) million and $0.7 million for the three months ended June 30, 2019 and 2018, respectively, from the change in the fair value of interest rate swaps.

[2] The net loss from fair value adjustments presented in the above table does not include net (losses) gains of ($2.6) million and $2.4 million for the six months ended June 30, 2019 and 2018, respectively, from the change in the fair value of interest rate swaps.