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Note 3 - Securities (Details) - Debt Securities by Maturity
Dec. 31, 2015
USD ($)
Note 3 - Securities (Details) - Debt Securities by Maturity [Line Items]  
Due in one year or less 0.89%
Due in one year or less $ 40,382,000
Due in one year or less $ 40,399,000
Due from one to five years 1.67%
Due from one to five years $ 110,364,000
Due from one to five years $ 110,552,000
Due from five to ten years 3.09%
Due from five to ten years $ 54,022,000
Due from five to ten years $ 54,868,000
Due after ten years 3.55%
Due after ten years $ 71,412,000
Due after ten years $ 72,158,000
2.22%
$ 344,796,000
$ 346,992,000
Collateralized Mortgage Backed Securities [Member]  
Note 3 - Securities (Details) - Debt Securities by Maturity [Line Items]  
No single maturity, weighted average yield 1.75%
No single maturity, amortized cost $ 66,670,000
No single maturity, fair value $ 67,074,000
Other Debt Obligations [Member]  
Note 3 - Securities (Details) - Debt Securities by Maturity [Line Items]  
No single maturity, weighted average yield 2.51%
No single maturity, amortized cost $ 1,946,000
No single maturity, fair value $ 1,941,000