v3.21.2

Segment Reporting (Details) - USD ($) | 12 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Segment Reporting [Abstract] |  |
Gross revenue | $ 25.8 | $ 25,800,000
Gross cost of revenue | $ 24,300,000 | $ 24,300,000

X
- Definition Gross cost of revenue. + References No definition available. + Details
Name: | sino_GrossCostOfRevenue
Namespace Prefix: | sino_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Gross revenue. + References No definition available. + Details
Name: | sino_GrossRevenue
Namespace Prefix: | sino_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration