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Note 11 - Term Debt (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2015
Mar. 31, 2016
Dec. 31, 2015
Note 11 - Term Debt (Details) [Line Items]      
Debt, Weighted Average Interest Rate   0.33%  
Mortgage Loans on Real Estate, Commercial and Consumer, Net   $ 349,600  
Proceeds from Issuance of Senior Long-term Debt     $ 10,000
Proceeds from Issuance of Subordinated Long-term Debt $ 10,000    
Senior Notes [Member]      
Note 11 - Term Debt (Details) [Line Items]      
Debt Instrument, Periodic Payment     83
Debt Issuance Costs, Gross 15   $ 15
Senior Notes [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Note 11 - Term Debt (Details) [Line Items]      
Debt Instrument, Basis Spread on Variable Rate     4.00%
Bank of America Branches [Member]      
Note 11 - Term Debt (Details) [Line Items]      
Capital Lease Obligations   $ 172  
Bank of America Branches [Member] | Capital Lease Obligations [Member]      
Note 11 - Term Debt (Details) [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   6.00%  
Debt Instrument, Term   4 years  
Fixed to Floating Interest Rate [Member] | Subordinated Debt [Member]      
Note 11 - Term Debt (Details) [Line Items]      
Debt Issuance Costs, Gross $ 210   $ 210
Debt Instrument, Interest Rate, Stated Percentage 6.88%   6.88%
Debt, Fixed Interest Term 5 years    
Fixed to Floating Interest Rate [Member] | Subordinated Debt [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Note 11 - Term Debt (Details) [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 5.26%    
Federal Home Loan Bank of San Francisco [Member]      
Note 11 - Term Debt (Details) [Line Items]      
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available $ 120,000 $ 80,000 $ 120,000
Federal Home Loan Bank, Advances, Activity for Year, Average Balance of Agreements Outstanding   71,800 $ 87,600
Federal Home Loan Bank Stock   4,500  
Pledged Financial Instruments, Not Separately Reported, Securities for Federal Home Loan Bank   $ 19,000