Note 9 - 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) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Trust Preferred Securities [Member]
Beginning balance				$ 7,191
Ending balance		$ 1,083		1,083
Fair Value, Inputs, Level 3 [Member] | Trust Preferred Securities [Member]
Beginning balance		7,444	$ 7,167	7,361	$ 7,212
Security call		(6,300)		(6,300)
Net gain from fair value adjustment of financial assets	[1]	28	23	108	(23)
Net loss from fair value adjustment of financial liabilities	[1]
Decrease in accrued interest receivable		(89)		(88)
Increase in accrued interest payable					1
Change in unrealized gains included in other comprehensive income			1	2	1
Ending balance		1,083	7,191	1,083	7,191
Changes in unrealized gains held at period end			1		1
Fair Value, Inputs, Level 3 [Member] | Junior Subordinated Debentures [Member]
Beginning balance		35,137	27,485	33,959	29,018
Security call
Net gain from fair value adjustment of financial assets	[1]
Net loss from fair value adjustment of financial liabilities	[1]	925	296	2,090	(1,250)
Decrease in accrued interest receivable
Increase in accrued interest payable		9	10	22	23
Change in unrealized gains included in other comprehensive income
Ending balance		36,071	27,791	36,071	27,791
Changes in unrealized gains held at period end

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