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Note 14 - Derivatives (Details)
3 Months Ended 12 Months Ended
Mar. 14, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Note 14 - Derivatives (Details) [Line Items]      
Gain (Loss) on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net   $ (2,325,000)  
Obligation to Return Securities Received as Collateral     $ 2,400,000
Number of Mortgage Backed Securities Pledged     3
Pledge On One Mortgage Backed Securities     $ 3,800,000
Fair Value, Estimate Not Practicable, Mortgage-backed Securities Held-to-maturity     $ 4,000,000
Interest Rate Swap [Member]      
Note 14 - Derivatives (Details) [Line Items]      
Derivative, Number of Instruments Held     1
Derivative Asset, Fair Value, Amount Not Offset Against Collateral   0 $ 0
Forward Starting Interest Rate Swap One [Member]      
Note 14 - Derivatives (Details) [Line Items]      
Derivative, Number of Instruments Held     1
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]      
Note 14 - Derivatives (Details) [Line Items]      
Gain (Loss) on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net   2,300,000  
Federal Home Loan Bank of San Francisco [Member]      
Note 14 - Derivatives (Details) [Line Items]      
Repayments of Federal Home Loan Bank Borrowings $ 75,000,000    
Federal Home Loan Bank of San Francisco [Member] | Designated as Hedging Instrument [Member]      
Note 14 - Derivatives (Details) [Line Items]      
Repayments of Federal Home Loan Bank Borrowings   $ 75,000,000