Note 2 - Earnings Per Share - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Net income (loss)	$ 1,058	$ (186)	[1]
Weighted average shares outstanding (in shares)	6,617,507	6,612,500	[1]
Weighted average unallocated Employee Stock Ownership Plan Shares (in shares)	(249,783)	(257,245)	[1]
Basic weighted average shares outstanding (in shares)	6,367,724	6,355,255	[1]
Dilutive potential common shares (in shares)			[1]
Diluted weighted average shares outstanding (in shares)	6,367,724	6,355,255
Basic earnings (loss) per share (in dollars per share)	$ 0.17	$ (0.03)	[1]
Diluted earnings (loss) per share (in dollars per share)	$ 0.17	$ (0.03)	[1]

[1] Loss per shares for the year ended December 31, 2017, includes income attributed to the period prior to the initial public offering for the common shares issued.