PROPERTY, PLANT AND EQUIPMENT (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Land	$ 2,268,039us-gaap_Land	$ 2,268,039us-gaap_Land
Buildings	4,847,778us-gaap_BuildingsAndImprovementsGross	4,847,778us-gaap_BuildingsAndImprovementsGross
Buildings - Superior Auto Body	2,213,729sdpi_BuildingsSuperiorAutoBody	2,213,729sdpi_BuildingsSuperiorAutoBody
Leasehold improvements	717,232us-gaap_LeaseholdImprovementsGross	710,232us-gaap_LeaseholdImprovementsGross
Machinery and equipment	6,412,303us-gaap_MachineryAndEquipmentGross	6,338,521us-gaap_MachineryAndEquipmentGross
Machinery under capital lease	2,322,340us-gaap_CapitalLeasedAssetsGross	2,322,340us-gaap_CapitalLeasedAssetsGross
Furniture and fixtures	504,451us-gaap_FurnitureAndFixturesGross	466,213us-gaap_FurnitureAndFixturesGross
Transportation assets	1,343,349sdpi_TransportationEquipmentGross	1,343,349sdpi_TransportationEquipmentGross
Property, Plant and Equipment, Gross	20,629,221us-gaap_PropertyPlantAndEquipmentGross	20,510,201us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation	(5,034,189)	(4,546,572)
Property, Plant and Equipment, Net	$ 15,595,032us-gaap_PropertyPlantAndEquipmentNet	$ 15,963,629us-gaap_PropertyPlantAndEquipmentNet

Amount before accumulated depreciation of superior auto body buildings.

No definition available.

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- Definition

Amount before accumulated depreciation of transportation equipment.

+ References

No definition available.

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- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

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-Topic 210

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.14)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 14

-Article 5

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- Definition

Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing.

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-Section 45

-Paragraph 4

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- Definition

Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 30

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- Definition

Amount before accumulated depreciation of equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utilities. Examples include, but are not limited to, desks, chairs, tables, and bookcases.

+ References

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- Definition

Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

+ References

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-Publisher FASB

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-Topic 210

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-Paragraph 1

-Subparagraph (SX 210.5-02.13)

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- Definition

Amount before accumulated depreciation of additions or improvements to assets held under a lease arrangement.

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- Definition

Amount before accumulated depreciation of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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