Significant Accounting Policies (Cash and Cash Equivalents) (Details) - USD ($)	3 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Jun. 30, 2018
Accounting Policies [Abstract]
Restricted Cash	$ 253,404	$ 253,135	$ 250,781	$ 250,000
Maximum maturity of highly liquid investments, period	90 days