Consolidated Statements of Shareholders' Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
Jun. 30, 2019	Jun. 30, 2018
Minimum pension liabilities net adjustment tax	$ 0	$ 103
Accumulated Other Comprehensive Loss [Member]
Minimum pension liabilities net adjustment tax	$ 0	$ 103

Other comprehensive income minimum pension liabilities net adjustment tax.

No definition available.

Name:	ssy_OtherComprehensiveIncomeMinimumPensionLiabilitiesNetAdjustmentTax
Namespace Prefix:	ssy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration