Income Taxes - Unrecognized Roll Forward (Details) - USD ($)	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020
Reconciliation of unrecognized tax benefits:
Gross unrecognized, ending	$ 678,000	$ 678,000	$ 866,000
Increase (Decrease) In unrecognized tax benefits from deemed dividends for investments in US property	0	(3,000)	682,000
Increases to unrecognized tax benefits resulting from the generation of additional R&D credits			59,000
Decrease to unrecognized tax benefits resulting from settled IRS audit		(185,000)
Gross unrecognized, beginning	678,000	866,000	125,000
Interest
Unrecognized interest, beginning	63,000	83,000	0
Unrecognized benefits interest accrual, increase from deemed dividends	25,000		83,000
Unrecognized benefits interest accrual, decrease from deemed dividends		(20,000)
Unrecognized interest, ending	88,000	63,000	83,000
Total
Total unrecognized benefits and accrued interest, beginning	741,000	949,000	125,000
Increase (decrease) to unrecognized tax benefits and accrued interest for deemed dividends	(25,000)	(23,000)	765,000
Increases to unrecognized tax benefits resulting from the generation of additional R&D credits			59,000
Decrease to unrecognized tax benefits resulting from settled IRS audit		(185,000)
Total unrecognized benefits and accrued interest, ending	$ 766,000	$ 741,000	$ 949,000