Note 10 - 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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Trust Preferred Securities [Member]
Beginning balance		$ 1,188	$ 7,444	$ 1,110	$ 7,361
Security Call			(6,300)		(6,300)
Net gain from fair value adjustment of financial assets	[1]	17	28	94	108
Net loss from fair value adjustment of financial liabilities	[1]
Decrease in accrued interest receivable			(89)	1	(88)
Increase (decrease) in accrued interest payable
Change in unrealized gains (losses) included in other comprehensive income					2
Ending balance		1,205	1,083	1,205	1,083
Changes in unrealized gains (losses) held at period end					2
Junior Subordinated Debentures [Member]
Beginning balance		39,566	35,137	36,986	33,959
Security Call
Net gain from fair value adjustment of financial assets	[1]
Net loss from fair value adjustment of financial liabilities	[1]	607	925	3,155	2,090
Decrease in accrued interest receivable
Increase (decrease) in accrued interest payable		(9)	9	42	22
Change in unrealized gains (losses) included in other comprehensive income		(13)		(32)
Ending balance		40,151	36,071	40,151	36,071
Changes in unrealized gains (losses) held at period end		$ (13)		$ (32)

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