Note 11 - Fair Value of Financial Instruments - Assets and Liabilities Carried at Fair Value on a Recurring Basis, Classified Within Level 3 of the Valuation Hierarchy (Details) - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Trust Preferred Securities [Member]
Beginning balance		$ 1,303	$ 1,188	$ 1,256	$ 1,110
Net gain from fair value adjustment of financial assets	[1]	15	17	64	94
Net loss from fair value adjustment of financial liabilities	[1]	0	0	0	0
Decrease (increase) in accrued interest payable		0	0	(2)	0
Change in unrealized gains included in other comprehensive income		0	0	0	0
Ending balance		1,318	1,205	1,318	1,205
Changes in unrealized gains held at period end		0	0	0	0
Increase in accrued interest receivable				0	1
Junior Subordinated Debentures [Member]
Beginning balance		43,414	39,566	41,849	36,986
Net gain from fair value adjustment of financial assets	[1]	0	0	0	0
Net loss from fair value adjustment of financial liabilities	[1]	599	607	2,353	3,155
Decrease (increase) in accrued interest payable		(15)	(9)	(27)	42
Change in unrealized gains included in other comprehensive income		(88)	(13)	(265)	(32)
Ending balance		43,910	40,151	43,910	40,151
Changes in unrealized gains held at period end		$ 1,513	$ 1,164	1,513	1,164
Increase in accrued interest receivable				$ 0	$ 0

[1] Totals in the table above are presented in the Consolidated Statement of Income under net loss from fair value adjustments.