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
		Mar. 31, 2019	Mar. 31, 2018
Trust Preferred Securities [Member]
Beginning balance		$ 1,256	$ 1,110
Net gain from fair value adjustment of financial assets	[1]	33	51
Net loss from fair value adjustment of financial liabilities	[1]
Decrease(increase) in accrued interest receivable			1
Increase (decrease) in accrued interest payable
Change in unrealized gains (losses) included in other comprehensive income
Ending balance		1,289	1,162
Changes in unrealized gains (losses) held at period end
Junior Subordinated Debentures [Member]
Beginning balance		41,849	36,986
Net gain from fair value adjustment of financial assets	[1]
Net loss from fair value adjustment of financial liabilities	[1]	1,210	1,681
Decrease(increase) in accrued interest receivable
Increase (decrease) in accrued interest payable		9	25
Change in unrealized gains (losses) included in other comprehensive income		(127)
Ending balance		42,941	38,692
Changes in unrealized gains (losses) 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.