Business Risk and Credit Risk Concentration Involving Cash - Narrative (Details) |
12 Months Ended | ||
---|---|---|---|
Jun. 30, 2018
Customer
|
Jun. 30, 2017
Customer
|
Oct. 31, 2008
USD ($)
|
|
Risks And Uncertainties [Abstract] | |||
Revenue from number of customers | Customer | 2 | 2 | |
FDIC increased insurance amount per depositor | $ | $ 250,000 |