Note 3 - Earnings Per Share - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018		Jun. 30, 2017
Net income	$ 353	$ 111	$ 476		$ 192
Weighted average shares outstanding (in shares)	6,612,500		6,612,500	[1]
Weighted average unallocated Employee Stock Ownership Plan Shares (in shares)	(250,863)		(252,483)	[1]
Basic weighted average shares outstanding (in shares)	6,361,637		6,360,017	[1]
Dilutive potential common shares (in shares)				[1]
Dilutve weighted average shares outstanding (in shares)	6,361,637		6,360,017	[1]
Basic earnings per share (in dollars per share)	$ 0.06		$ 0.07	[1]
Diluted earnings per share (in dollars per share)	$ 0.06		$ 0.07	[1]

[1] Earnings per share for the three and six months ended June 30, 2017 is not applicable because the public offering was completed in October 2017.