Note 8 - Federal Home Loan Bank Borrowings - Federal Home Loan Bank of Atlanta Borrowings (Details) - Federal Home Loan Bank of Atlanta [Member] - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Federal Home Loan Bank Borrowings	$ 7,944	$ 11,028
Advance Date January 14, 2015 [Member]
Current rate	1.09%
Federal Home Loan Bank Borrowings		4,000
Advance Date August 19, 2016 [Member]
Current rate	2.535%
Federal Home Loan Bank Borrowings		4,000
Advance Date January 3, 2017 [Member]
Current rate	1.50%
Federal Home Loan Bank Borrowings	$ 361	695
Advance Date February 3, 2017 [Member]
Current rate	1.49%
Federal Home Loan Bank Borrowings	$ 389	722
Advance Date May 3, 2017 [Member]
Current rate	1.58%
Federal Home Loan Bank Borrowings	$ 944	1,611
Advance Date March 15, 2018 [Member]
Current rate	2.65%
Federal Home Loan Bank Borrowings	$ 1,000
Advance Date October 4, 2018 [Member]
Current rate	2.38%
Federal Home Loan Bank Borrowings	$ 3,150
Advance Date December 31, 2018 [Member]
Current rate	2.53%
Federal Home Loan Bank Borrowings	$ 2,100