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v3.22.1

Summary of Significant Accounting Policies (Details) | 12 Months Ended
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Dec. 31, 2021
Buildings | Minimum |
Useful life | 10 years
Shop Machinery and Equipment [Member] | Maximum |
Useful life | 10 years
Shop Machinery and Equipment [Member] | Minimum |
Useful life | 3 years
Land Improvements | Minimum |
Useful life | 10 years
Land Improvements | Maximum |
Useful life | 15 years
Office Equipment | Minimum |
Useful life | 3 years
Office Equipment | Maximum |
Useful life | 10 years
Trucks and Automotive Equipment | Minimum |
Useful life | 3 years
Trucks and Automotive Equipment | Maximum |
Useful life | 10 years
Rental Equipment | Minimum |
Useful life | 5 years
Rental Equipment | Maximum |
Useful life | 10 years

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=smid_ShopMachinerAndEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_VehiclesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=smid_RentalEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |