Note 6 - Loans (Details) - Composition of Troubled Debt Restructurings Impaired Loans - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Note 6 - Loans (Details) - Composition of Troubled Debt Restructurings Impaired Loans [Line Items]
Impaired loans	$ 31,108	$ 31,562
Trouble Debt Restructed Loans [Member]
Note 6 - Loans (Details) - Composition of Troubled Debt Restructurings Impaired Loans [Line Items]
Troubled debt restructurings	21,769	19,871
Accrual Loan [Member] | Trouble Debt Restructed Loans [Member]
Note 6 - Loans (Details) - Composition of Troubled Debt Restructurings Impaired Loans [Line Items]
Troubled debt restructurings	17,071	15,585
Accrual Loan [Member] | Impaired Loans Other Than Trouble Debt Restructured Loans [Member]
Note 6 - Loans (Details) - Composition of Troubled Debt Restructurings Impaired Loans [Line Items]
Impaired loans	17,071	15,585
Nonaccrual Loan [Member] | Trouble Debt Restructed Loans [Member]
Note 6 - Loans (Details) - Composition of Troubled Debt Restructurings Impaired Loans [Line Items]
Troubled debt restructurings	4,698	4,286
Nonaccrual Loan [Member] | Impaired Loans Other Than Trouble Debt Restructured Loans [Member]
Note 6 - Loans (Details) - Composition of Troubled Debt Restructurings Impaired Loans [Line Items]
Impaired loans	4,698	4,286
Accrual Other Loans [Member] | Impaired Loans Other Than Trouble Debt Restructured Loans [Member]
Note 6 - Loans (Details) - Composition of Troubled Debt Restructurings Impaired Loans [Line Items]
Impaired loans	7,705	7,955
Nonaccrual Other Loans [Member] | Impaired Loans Other Than Trouble Debt Restructured Loans [Member]
Note 6 - Loans (Details) - Composition of Troubled Debt Restructurings Impaired Loans [Line Items]
Impaired loans	$ 1,634	$ 3,736