Significant Accounting Policies (Cash and Cash Equivalents) (Details) - USD ($)	3 Months Ended
	Sep. 30, 2021	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Accounting Policies [Abstract]
Restricted Cash	$ 256,000	$ 256,102	$ 255,920	$ 255,668	$ 255,281
Maximum maturity of highly liquid investments, period	90 days