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Note 6 - Debt and Equity Securities (Details)	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Note 6 - Debt and Equity Securities (Details) [Line Items]
Trading Securities	$ 0	$ 0
Held-to-maturity Securities	6,180,000	$ 0
	4,510,000
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities			$ 1,419,000
REMIC and CMO [Member]
Note 6 - Debt and Equity Securities (Details) [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions		1
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities	$ 0	$ 0
REMIC and CMO [Member] | FHLMC [Member]
Note 6 - Debt and Equity Securities (Details) [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	6	7
REMIC and CMO [Member] | FNMA [Member]
Note 6 - Debt and Equity Securities (Details) [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	12	14
REMIC and CMO [Member] | GNMA [Member]
Note 6 - Debt and Equity Securities (Details) [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	15	8
Corporate Debt Securities [Member]
Note 6 - Debt and Equity Securities (Details) [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	12	5
Collateralized Debt Obligations [Member]
Note 6 - Debt and Equity Securities (Details) [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	7
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities	$ 0
Municipal Debt Securities [Member]
Note 6 - Debt and Equity Securities (Details) [Line Items]
Held-to-maturity Securities	$ 6,180,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions		3
Municipal [Member]
Note 6 - Debt and Equity Securities (Details) [Line Items]
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities		$ 0
Single Issuer Trust Preferred Security [Member]
Note 6 - Debt and Equity Securities (Details) [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	1	1
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities	$ 0	$ 0
Pooled Trust Preferred Securities [Member]
Note 6 - Debt and Equity Securities (Details) [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions		3
Proceeds from Sale of Available-for-sale Securities		$ 11,100,000
Available-for-sale Securities, Gross Realized Losses		$ 2,300,000
GNMA [Member]
Note 6 - Debt and Equity Securities (Details) [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	1	1
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities	$ 0	$ 0
FNMA [Member]
Note 6 - Debt and Equity Securities (Details) [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	20	13
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities	$ 0	$ 0
FHLMC [Member]
Note 6 - Debt and Equity Securities (Details) [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	3	1
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities	$ 0	$ 0
Collateralized Mortgage Backed Securities [Member]
Note 6 - Debt and Equity Securities (Details) [Line Items]
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities	0
Commercial Mortgage Backed Securities [Member]
Note 6 - Debt and Equity Securities (Details) [Line Items]
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities		0
Collateralized Mortgage Obligations [Member]
Note 6 - Debt and Equity Securities (Details) [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions			4
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities			$ 1,400,000
Proceeds from Sale of Available-for-sale Securities			18,300,000
Available-for-sale Securities, Gross Realized Losses			$ 1,700,000
Municipal Bonds [Member]
Note 6 - Debt and Equity Securities (Details) [Line Items]
	$ 4,500,000
Municipal Bonds [Member] | REMIC and CMO [Member] | FHLMC [Member]
Note 6 - Debt and Equity Securities (Details) [Line Items]
Held-to-maturity Securities, Maturity Term	7 months
Non-Qualified Deferred Compensation Plan [Member]
Note 6 - Debt and Equity Securities (Details) [Line Items]
Defined Benefit Plan, Assets for Plan Benefits	$ 10,600,000	10,000,000
Non-Qualified Deferred Compensation Plan [Member] | Other Assets [Member]
Note 6 - Debt and Equity Securities (Details) [Line Items]
Defined Benefit Plan, Assets for Plan Benefits	$ 14,800,000	$ 14,000,000
Collateralized Mortgage Obligations [Member] | Collateralized by Commercial Real Estate [Member]
Note 6 - Debt and Equity Securities (Details) [Line Items]
Private Issue Collateralized Mortgage Obligations, Number	1	3
Mortgage Backed Securities Available for Sale, Amortized Cost	$ 7,700,000	$ 12,400,000

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