Employee Retirement Benefits (Details Textual) - USD ($)	12 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Schedule Of Employee Retirement Benefits [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 197,999	$ 204,951	$ 228,854
Percentage Of Eligible Salaried Employees Annual Income	2.00%
Percentage Of Annual Income To Plan	25.00%
Percentage Of Employee Deferrals	8.00%

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Name:	us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration