No definition available.

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Namespace Prefix:	sts_
Data Type:	xbrli:stringItemType
Balance Type:	na
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- Definition

Represents the period of credited service for which the employees are required to work in order to be eligible under the defined contribution plan.

+ References

No definition available.

+ Details

Name:	sts_DefinedContributionPlanEligibilityRequisiteCreditedServicePeriod
Namespace Prefix:	sts_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the specified age required for eligibility under the defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	sts_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the percentage of annual compensation that can be contributed by eligible employees to the defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	sts_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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RETIREMENT PLAN. (Details) - USD ($)	12 Months Ended
RETIREMENT PLAN. (Details) - USD ($)	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Retirement plan
Age requirement for employees to be covered under the defined contribution plan	21 years
Credited service period requirement for employees to be covered under the defined contribution plan	30 days
Employer's matching contribution (as a percent)	50.00%
Percentage of maximum employee's compensation matched by employer	4.00%
Expense	$ 438,329	$ 411,756	$ 414,739
Maximum
Retirement plan
Employee's contribution as a percentage of annual compensation	15.00%
Minimum
Retirement plan
Employee's contribution as a percentage of annual compensation	1.00%