Earnings Per Share - Computation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019
Composition of the weighted average common shares used in the basic and diluted earnings per share computation
Weighted-average common shares outstanding	4,667,304		4,158,113		4,667,304	4,158,113
Average treasury stock shares	(177,959)		(177,959)		(177,959)	(177,959)
Weighted-average common shares and common stock equivalents used to calculate basic and diluted earnings per share	4,489,345		3,980,154		4,489,345	3,980,154
Net Income	$ 1,376	$ 670	$ 929	$ 854	$ 2,046	$ 1,783
Basic and diluted earnings per share (in dollars per share)	$ 0.31		$ 0.23		$ 0.46	$ 0.45