Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2018
Accounts Payable and Accrued Expenses
Accounts payable, trade	$ 221	$ 582
Accrued payroll, vacation and other employee expenses	56	31
Unrecognized income from research and development tax credits	35	130
Accrued income taxes	0	87
Dividends payable	1	1
Other accrued expenses	347	458
Total accounts payable and accrued expenses	$ 660	$ 1,289