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Note 18 - Regulatory Restrictions (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Jun. 15, 2018
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2018
Jan. 01, 2017
Jan. 01, 2016
Retained Earnings, Unappropriated   $ 7,000     $ 7,000        
Common Stock, Dividends, Per Share, Cash Paid $ 0.04       $ 0.04        
Dividends Payable, Date to be Paid Jun. 15, 2018       Jun. 15, 2018        
Dividends Payable, Date of Record         May 31, 2018        
Common Stock, Dividends, Per Share, Declared   $ 0.04 $ 0.04 $ 0.04 $ 0.12        
Dividends, Cash, Total           $ 0      
Capital Conservation Buffer Required for Capital Adequacy                 2.50%
Common Equity Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets   6.375%     6.375% 5.75% 6.375% 5.75%  
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets   7.875%     7.875% 7.25% 7.875% 7.25%  
Capital Required for Capital Adequacy to Risk Weighted Assets   9.875%     9.875% 9.25% 9.875% 9.25%  
Tier One Leverage Capital Required for Capital Adequacy to Average Assets   4.00%     4.00% 4.00% 4.00% 4.00%