Interim Financial Reporting (Policies)	9 Months Ended
Interim Financial Reporting (Policies)	Sep. 30, 2016
INTERIM FINANCIAL REPORTING [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements were prepared in accordance with accounting principles generally accepted in the United States of America (GAAP) for interim financial information, and with the instructions to Form 10-Q and Article 10 and Regulation S-X. Accordingly, we have condensed or omitted certain information and footnote disclosures that are included in our annual financial statements. These condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the related notes included in our Annual Report on Form 10-K for the year ended December 31, 2015. The condensed consolidated December 31, 2015 balance sheet was derived from audited financial statements included in the Form 10-K. In the opinion of management, these condensed consolidated financial statements reflect all adjustments (which consist of normal, recurring adjustments) necessary for a fair presentation of the financial position and results of operations and cash flows for the periods presented. The results disclosed in the condensed consolidated statements of operations are not necessarily indicative of the results to be expected in any future periods.
Recent Accounting Pronouncements	Recent Accounting Pronouncements
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Revenue Recognition	Revenue Recognition Smith-Midland Corporation (the "Company") primarily recognizes revenue on the sale of its standard precast concrete products at shipment date, including revenue derived from any projects to be completed under short-term contracts. Installation of the Company’s standard products is typically performed by the customer; however, in some circumstances, the Company will install certain products which are accomplished at the time of delivery. The installation activities of smaller buildings are usually performed at the Company's site and shipped completed to the customers site. In larger utility building sales, the buildings are erected on the customers site within one or two days, depending on style and size. The value assigned to each component is determined by an estimate provided to the customer at the time of the sale. We use our best estimate to determine the sales price, which is consistent with our pricing strategy of the business and considers product configuration, geography and other market specific factors. Leasing fees from barrier rental agreements are paid at the beginning of the operating lease agreement and recorded to a deferred revenue account. As the revenue is earned each month during the contract, the amount earned is recorded as lease income and an equivalent amount is debited to deferred revenue. Royalties are recognized as a percent of sales of the licensed product sold by the licensee on a monthly basis. The Company licenses certain other precast companies to produce its licensed products to meet engineering specifications under licensing agreements. The agreements are typically for five year terms and require royalty payments to be made to the Company ranging from 4% to 6% which are paid on a monthly basis. With respect to certain sales of Soundwall panels, architectural precast panels and Slenderwall™ precast panels, revenue is recognized using the percentage-of-completion method for recording revenues on long term contracts pursuant to ASC 605-35-25 using the units-of-production as the basis to measure progress toward completing the contract. The contracts are executed by both parties and clearly stipulate the requirements for progress payments and a schedule of delivery dates. Provisions for estimated losses on contracts are made in the period in which such losses are determined. Shipping revenue and costs are recognized in the period the shipping services are provided to the customer. Smith-Midland products are typically sold pursuant to an implicit warranty as to merchantability only. Warranty claims are reviewed and resolved on a case by case method. Although the Company does incur costs for these types of expenses, historically the amount of expense is immaterial.

Disclosure of accounting policy for revenue recognition. If the entity has different policies for different types of revenue transactions, the policy for each material type of transaction is generally disclosed. If a sales transaction has multiple element arrangements (for example, delivery of multiple products, services or the rights to use assets) the disclosure may indicate the accounting policy for each unit of accounting as well as how units of accounting are determined and valued. The disclosure may encompass important judgment as to appropriateness of principles related to recognition of revenue. The disclosure also may indicate the entity's treatment of any unearned or deferred revenue that arises from the transaction.