Note 12 - Long-term Debt - Summary of Information Concerning Long-term FHLB Advances and Other Borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Long-term debt	$ 0	$ 10,000
Average balance during the year	5,288	11,452
Maximum month-end balance during the year	$ 10,000	$ 15,000
Average rate paid during the year	1.90%	1.55%
Weighted average remaining maturity (in years) (Year)		302 days