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v2.4.1.9

Employee Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract] |  |
Maximum annual contributions per employee, percent | 10.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent |
Employer matching contribution, percent of match | 50.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch |
Employer matching contribution, percent of employees' gross pay | 4.00%smid_DefinedContributionPlanEmployerMatchingContributionPercentOfEmployeesGrossPay |
Cost recognized | $ 89 us-gaap_DefinedContributionPlanCostRecognized | $ 79 us-gaap_DefinedContributionPlanCostRecognized

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- Definition Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay + References No definition available. + Details
Name: | smid_DefinedContributionPlanEmployerMatchingContributionPercentOfEmployeesGrossPay
Namespace Prefix: | smid_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DefinedBenefitPensionPlansAndDefinedBenefitPostretirementPlansDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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=6414718&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- 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