Note 10 - Borrowed Funds - Federal Home Loan Bank Advances (Details) (Parentheticals)	Dec. 31, 2019	Dec. 31, 2018
Fixed Rate Federal Home Loan Bank Advances [Member] | Maximum [Member]
Advances rate	2.11%	2.76%
Fixed Rate Federal Home Loan Bank Advances [Member] | Weighted Average [Member]
Advances rate	2.62%	2.29%
Variable Rate Federal Home Loan Bank Advances [Member] | Weighted Average [Member]
Advances rate		2.87%