Defined Benefit Pension Plan - Funded status (Details) - USD ($)	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Change in projected benefit obligation
Projected benefit obligation at beginning of year	$ 9,453,322	$ 9,732,735
Interest cost	398,439	287,227
Benefits paid	(144,765)	(93,032)
Actuarial (gain) loss	894,036	(473,608)
Projected benefit obligation at end of year	10,601,032	9,453,322
Change in plan assets
Fair value of plan assets at beginning of year	9,691,252	9,131,715
Actual return on assets	223,683	652,520
Employer contributions		4,603
Expenses paid from trust		(4,554)
Benefits paid	(144,765)	(93,032)
Fair value of plan assets at end of year	9,770,170	9,691,252
Funded status at end of year	$ (830,862)	$ 237,930