Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings (Non Accruing Troubled Debt Restructuring [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	$ 41,618,000	$ 38,769,000
Interest Deferral [Member] | Commercial Loans [Member]
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	1,184,000
Interest Deferral [Member] | Commercial Mortgage Loans [Member]
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs		1,443,000
Interest Deferral [Member] | Residential Mortgage Loans [Member]
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs		241,000
Interest Deferral [Member]
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	1,184,000	1,684,000
Principal Deferral [Member] | Commercial Loans [Member]
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	239,000	2,866,000
Principal Deferral [Member] | Real Estate Construction Loans [Member]
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs		16,009,000
Principal Deferral [Member] | Commercial Mortgage Loans [Member]
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	15,917,000	2,168,000
Principal Deferral [Member] | Residential Mortgage Loans [Member]
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	1,026,000	2,206,000
Principal Deferral [Member]
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	17,182,000	23,249,000
Rate Reduction [Member] | Commercial Loans [Member]
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	860,000	1,352,000
Rate Reduction [Member]
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	860,000	1,352,000
Rate Reduction and Payment Deferral [Member] | Commercial Loans [Member]
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	1,269,000
Rate Reduction and Payment Deferral [Member] | Real Estate Construction Loans [Member]
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	19,462,000	9,263,000
Rate Reduction and Payment Deferral [Member] | Commercial Mortgage Loans [Member]
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	973,000	1,843,000
Rate Reduction and Payment Deferral [Member] | Residential Mortgage Loans [Member]
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	688,000	1,378,000
Rate Reduction and Payment Deferral [Member]
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	22,392,000	12,484,000
Commercial Loans [Member]
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	3,552,000	4,218,000
Real Estate Construction Loans [Member]
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	19,462,000	25,272,000
Commercial Mortgage Loans [Member]
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	16,890,000	5,454,000
Residential Mortgage Loans [Member]
Note 5 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]
Non-accrual TDRs	$ 1,714,000	$ 3,825,000