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Note 12 - Term Debt (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Dec. 11, 2015
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Proceeds from Issuance of Senior Long-term Debt   $ 10,000    
Proceeds from Issuance of Subordinated Long-term Debt $ 10,000 10,000    
Senior Notes [Member]        
Debt Instrument, Periodic Payment   83    
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid   5,000    
Debt Issuance Costs, Gross   $ 15    
Senior Notes [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument, Basis Spread on Variable Rate   4.00%    
Subordinated Debt [Member]        
Debt Instrument, Interest Rate, Stated Percentage 6.88%      
Subordinated Debt [Member] | Fixed to Floating Interest Rate [Member]        
Debt Issuance Costs, Gross   $ 210    
Debt Instrument, Interest Rate, Stated Percentage   6.88%    
Debt Fixed Interest Term   5 years    
Subordinated Debt [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument, Basis Spread on Variable Rate 4.00%      
Subordinated Debt [Member] | London Interbank Offered Rate (LIBOR) [Member] | Fixed to Floating Interest Rate [Member]        
Debt Instrument, Basis Spread on Variable Rate   5.26%    
Federal Home Loan Bank of San Francisco [Member]        
Federal Home Loan Bank, Advances, Activity for Year, Average Balance of Agreements Outstanding     $ 302 $ 18,000
Federal Home Loan Bank, Advances, Activity for Year, Maximum Outstanding at any Month End     10,000 80,000
Advances from Federal Home Loan Banks     $ 0 $ 0