Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Proceeds from Federal Reserve $ 1,300 $ 1,300    
Loans Still Classified as Non-accrual Status, Period of Past Due   90 days    
Financing Receivable Performance Period Under Loan Terms for Reclassification from Non-accrual Status   180 days    
Outstanding Loans Balances That Are Considered to Be Within Homogeneous Pools and Not Individually Evaluated for Impairment, Maximum   $ 100    
Minimum Balance of Impaired Loan Relationships That Are Individually Evaluated for Impairment   100    
Proceeds from the Sale of SBA Guarantees   $ 1,315 $ 0 $ 0
Core Deposits [Member]        
Finite-Lived Intangible Asset, Useful Life   10 years    
Finite-Lived Intangible Assets, Net     137  
Other Assets [Member]        
Federal Reserve Bank Stock 1,300 $ 1,300 1,300  
Other Liabilities [Member] | Guaranteed Minimum Death Benefit [Member]        
Net Amount at Risk by Product and Guarantee, Net Amount at Risk $ 105 $ 105 $ 101