Note 7 - Advances From Federal Home Loan Bank - Advances From the Federal Home Loan Bank (Details) (Parentheticals)	Dec. 31, 2018	Dec. 31, 2017
Minimum [Member]
Short-term advances from the FHLB, fixed rate	2.47%	2.47%
Long term advances from the FHLB, fixed rate	0.00%	0.00%
Maximum [Member]
Short-term advances from the FHLB, fixed rate	2.52%	2.52%
Long term advances from the FHLB, fixed rate	5.24%	5.24%