Note 18 - 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		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015
Trust Preferred Securities [Member]
Beginning balance		$ 7,212
Ending balance		7,361	$ 7,212
Fair Value, Inputs, Level 3 [Member] | Trust Preferred Securities [Member]
Beginning balance		7,212	7,090
Net gain from fair value adjustment of financial assets	[1]	149	117
Net loss from fair value adjustment of financial liabilities	[1]
Increase in accrued interest payable
Change in unrealized gains included in other comprehensive income			5
Ending balance		7,361	7,212
Changes in unrealized held at period end			5
Transfers to held-to-maturity
Purchases
Principal repayments
Maturities
Sales
Fair Value, Inputs, Level 3 [Member] | Municipal Debt Securities [Member]
Beginning balance			15,519
Net gain from fair value adjustment of financial assets	[1]
Net loss from fair value adjustment of financial liabilities	[1]
Increase in accrued interest payable
Change in unrealized gains included in other comprehensive income
Ending balance
Changes in unrealized held at period end
Transfers to held-to-maturity			(4,510)
Purchases			1,000
Principal repayments			(8,009)
Maturities			(4,000)
Sales
Fair Value, Inputs, Level 3 [Member] | Junior Subordinated Debentures [Member]
Beginning balance		29,018	28,771
Net gain from fair value adjustment of financial assets	[1]
Net loss from fair value adjustment of financial liabilities	[1]	4,908	238
Increase in accrued interest payable		33	9
Change in unrealized gains included in other comprehensive income
Ending balance		33,959	29,018
Changes in unrealized held at period end
Transfers to held-to-maturity
Purchases
Principal repayments
Maturities
Sales

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