Basis of Presentation and Significant Accounting Policies [Text Block] | Note 1. Nature of Business and Significant Accounting Policies STG Group, Inc. (formerly, Global Defense & National Security Systems, Inc. or GDEF) and its subsidiaries (collectively, the Company) was originally incorporated in Delaware on July 3, 2013 as a blank check company, with Global Defense & National Security Holdings LLC (”Global Defense LLC” or the “Sponsor”) as Sponsor, formed for the purpose of effecting a merger, capital stock exchange, asset acquisition, stock purchase, reorganization, exchangeable share transaction or other similar business combination. On November 23, 2015, the Company consummated its business combination with STG Group Holdings, Inc. (formerly, STG Group, Inc. or “STG Group”) pursuant to the stock purchase agreement, dated as of June 8, 2015, which provided for the purchase of all the capital stock of STG Group by the Company (the “Business Combination”). In connection with the closing of the Business Combination, the Company ceased to be a shell company in accordance with its Amended and Restated Certificate of Incorporation. The Company also changed its name from Global Defense & National Security Systems, Inc. to STG Group, Inc., and the Company’s securities were delisted from The NASDAQ Capital Market. The Company recommenced trading of its common stock under the symbol “STGG” on the OTC Pink Current Information tier of the over-the counter market. The Company’s common stock now trades over-the-counter on the OTCQB. See Note 2 for a further discussion of the Business Combination. The Company provides enterprise engineering, telecommunications, information management and security products and services to the federal government and commercial businesses. Segment information is not presented since all of the Company’s revenue is attributed to a single reportable segment. The accompanying unaudited condensed consolidated financial statements of the Company have been prepared in accordance with generally accepted accounting principles for interim financial reporting and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. For additional information, including the Company’s significant accounting policies, refer to the condensed consolidated financial statements and related footnotes in the Company’s condensed consolidated financial statements for the period from January 1, 2015 through November 23, 2015 and for the period from November 24, 2015 through December 31, 2015 included in the Company’s Annual Report on Form 10K for the year ended December 31, 2015. As a result of the Business Combination, the Company was identified as the acquirer for accounting purposes, and STG Group is the acquiree and accounting predecessor. This determination was based upon an evaluation of facts which included, but was not limited to, consideration of the following: 1) the relative voting rights of the stockholders in the combined entity after the Business Combination; 2) the composition of the board of directors of the combined entity; 3) the composition of the senior management team of the combined entity; 4) and the cash consideration that was transferred by the Company to the acquiree’s stockholders. Based upon this evaluation, the preponderance of facts supported the conclusion that the Company was the accounting acquirer. The Company’s financial statement presentation distinguishes a “Predecessor” for STG Group for the periods up to and prior to November 23, 2015 (the “Closing Date”). The Company was subsequently re-named as STG Group, Inc. and is the “Successor” for periods after the Closing Date, which includes the consolidation of STG Group subsequent to the Business Combination. The acquisition was accounted for as a business combination using the acquisition method of accounting, and Successor financial statements reflect a new basis of accounting that is based on the fair value of the net assets acquired. As a result of the application of the acquisition method of accounting as of the effective date of the acquisition, the financial statements for the Predecessor period and for the Successor period are presented on a different basis and, therefore, are not comparable. In the opinion of management, all adjustments considered necessary for a fair statement of financial results have been made. Such adjustments consist of only those of a normal recurring nature. Operating results for the three and nine months ended September 30, 2016 and 2015, are not necessarily indicative of the results that may be expected for the entire fiscal year. Figures are expressed in thousands of dollars unless otherwise indicated. The preparation of financial statements requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements. Actual results could differ from those estimates. Significant estimates embedded in the condensed consolidated financial statements for the periods presented include revenue recognition on fixed-price contracts, the allowance for doubtful accounts, the valuation and useful lives of intangible assets, the length of certain customer relationships, useful lives of property, plant and equipment, valuation of a Rabbi Trust and related deferred compensation liability. Estimates and assumptions are also used when determining the allocation of the purchase price in a business combination to the fair value of assets and liabilities and determining related useful lives. Revenue is recognized when persuasive evidence of an arrangement exists, services have been rendered or goods delivered, the contract price is fixed or determinable and collectability is reasonably assured. Revenue associated with work performed prior to the completion and signing of contract documents is recognized only when it can be reliably estimated and realization is probable. The Company bases its estimates on previous experiences with the customer, communications with the customer regarding funding status and its knowledge of available funding for the contract. Revenue on cost-plus-fee contracts is recognized to the extent of costs incurred plus a proportionate amount of the fee earned. The Company considers fixed fees under cost-plus-fee contracts to be earned in proportion to the allowable costs incurred in performance of the contract. The Company considers performance-based fees, including award fees, under any contract type to be earned when it can demonstrate satisfaction of performance goals, based upon historical experience, or when the Company receives contractual notification from the customer that the fee has been earned. Revenue on time-and-materials contracts is recognized based on the hours incurred at the negotiated contract billing rates, plus the cost of any allowable material costs and out-of-pocket expenses. Revenue on fixed-price contracts is primarily recognized using the proportional performance method of contract accounting. Unless it is determined as part of the Company’s regular contract performance review that overall progress on a contract is not consistent with costs expended to date, the Company determines the percentage completed based on the percentage of costs incurred to date in relation to total estimated costs expected upon completion of the contract. Revenue on other fixed-price service contracts is generally recognized on a straight-line basis over the contractual service period, unless the revenue is earned, or obligations fulfilled, in a different manner. Provisions for estimated losses on uncompleted contracts are made in the period in which such losses are determined and are recorded as forward loss liabilities in the condensed consolidated financial statements. Changes in job performance, job conditions and estimated profitability may result in revisions to costs and revenue and are recognized in the period in which the revisions are determined. Multiple agencies of the federal government directly or indirectly provided the majority of the Company's contract revenue during the nine months ended September 30, 2016 and 2015. For the nine months ended September 30, 2016 and 2015, there were two federal agency customers that each provided revenue in excess of 10 79 76 Federal government contract costs, including indirect costs, are subject to audit and adjustment by the Defense Contract Audit Agency. Contract revenue has been recorded in amounts that are expected to be realized upon final settlement. Costs of revenue include all direct contract costs, as well as indirect overhead costs and selling, general and administrative expenses that are allowable and allocable to contracts under federal procurement standards. Costs of revenue also include costs and expenses that are unallowable under applicable procurement standards and are not allocable to contracts for billing purposes. Such costs and expenses do not directly generate revenue, but are necessary for business operations. For the three and nine months ended September 30, 2016 and 2015, there was one vendor that comprised approximately 10 11 11 The Company has investments in mutual funds held in a Rabbi Trust that are classified as trading securities. Management determines the appropriate classification of the securities at the time they are acquired and evaluates the appropriateness of such classifications at each balance sheet date. The securities are classified as trading securities because they are held for resale in anticipation of short-term (generally 90 days or less) fluctuations in market prices. The trading securities are stated at fair value. Realized and unrealized gains and losses and other investment income are included in other income in the accompanying consolidated statements of operations. Contract receivables are generated primarily from prime and subcontracting arrangements with federal governmental agencies. Billed contract receivables represent invoices that have been prepared based on contract terms and sent to the customer. Billed accounts receivable are considered past due if the invoice has been outstanding more than 30 days. The Company does not charge interest on accounts receivable; however, federal governmental agencies may pay interest on invoices outstanding more than 30 days. The Company records interest income from federal governmental agencies when received. All contract receivables are on an unsecured basis. Unbilled amounts represent costs and anticipated profits awaiting milestones to bill, contract retainages, award fees and fee withholdings, as well as amounts currently billable. In accordance with industry practice, contract receivables relating to long-term contracts are classified as current, even though portions of these amounts may not be realized within one year. Management determines the allowance for doubtful accounts by regularly evaluating individual customer receivables and considering a customer’s financial condition, credit history and current economic conditions. Management has recorded an allowance for contract receivables that are considered to be uncollectible. Both billed and unbilled receivables are written off when deemed uncollectible. Recoveries of receivables previously written off are recorded when received. The Company accounts for the valuation of long-lived assets, including amortizable intangible assets, under authoritative guidance issued by the Financial Accounting Standards Board (FASB), which requires that long-lived assets and certain intangible assets be reviewed for impairment whenever events or circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of the long-lived assets is measured by a comparison of the carrying amount of the asset to future undiscounted net cash flows expected to be generated by the assets. If such assets are considered to be impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the assets exceeds the estimated fair value of the assets. No indicators of impairment were identified for the nine month period ended September 30, 2016. No impairment losses were recorded during the nine month period ending September 30, 2016. Intangible assets of the Company are comprised of customer relationships and a trade name acquired as a result of the Business Combination described further in Note 2. The Company determined that the customer relationships and trade name represent finite-lived intangible assets with useful lives of eight to fifteen years, respectively. The assets are being amortized proportionately over the term of their useful lives based on the estimated economic benefit derived over the course of the asset life. The Company records the excess of the purchase price of an acquired company over the fair value of the identifiable net assets acquired as goodwill. In accordance with authoritative guidance issued by the FASB, entities can elect to use a qualitative approach to test goodwill for impairment. Under this approach, the Company performs a qualitative assessment (Step zero) to determine whether it is more-likely-than-not that the fair value of the reporting unit is less than the carrying value. If the fair value of the reporting unit is less than the carrying value of the reporting unit, the Company is required to perform a goodwill impairment test using a two-step approach, which is performed at the reporting unit level. In the second step, the implied value of the goodwill is estimated at the fair value of the reporting unit, less the fair value of all other tangible and identifiable intangible assets of the reporting unit. If the carrying amount of the goodwill exceeds the implied fair value of the goodwill, an impairment loss is recognized in the amount equal to that excess, not to exceed the carrying amount of the goodwill. If the fair value of the reporting unit is not less than the carrying value of the reporting unit, the two-step goodwill test is not required. Application of the goodwill impairment test requires judgment, including the identification of reporting units, assignment of assets and liabilities to reporting units, assignment of goodwill to reporting units and determination of the fair value of each reporting unit. The fair value of each reporting unit is estimated using a discounted cash flow methodology. This analysis requires significant judgments, including estimation of future cash flows, which is dependent on internal forecasts, estimation of the long-term rate of growth for the business, estimation of the useful life over which cash flows will occur and determination of the weighted-average cost of capital. This discounted cash flow analysis is corroborated by top-down analysis, including a market assessment of enterprise value. The Company has elected to perform its annual analysis on October 1 each year at the reporting unit level. As of the Closing Date of the Business Combination, the Company determined that there was one reporting unit and as a result of acquisition accounting for the Business Combination, the carrying value of the reporting unit was equal to its fair value on the Closing Date. No triggering events occurred during the nine month period ending September 30, 2016 requiring an interim impairment test. material. Income taxes: In connection with the Business Combination, STG Group (Predecessor) converted from a Subchapter S Corporation to a C Corporation. Prior to this, STG Group, excluding STG Netherlands and STG Doha, was treated as an S corporation under Subchapter S of the Internal Revenue Code. Therefore, in lieu of corporate income taxes, the Predecessor stockholder separately accounted for his pro-rata share of STG Group’s income, deductions, losses and credits. The Company accounts for income taxes under FASB ASC Topic 740, Income Taxes In accordance with authoritative guidance on accounting for uncertainty in income taxes issued by the FASB, management has evaluated the Company’s tax positions and has concluded that the Company has taken no uncertain tax positions that require adjustment to the quarterly condensed consolidated financial statements to comply with the provisions of this guidance. Interest and penalties related to tax matters are recognized in expense. There was no accrued interest or penalties recorded during the three and nine months ended September 30, 2016 and 2015. The carrying value of the Company’s cash and cash equivalents, contract receivables, line-of-credit, accounts payable and other short-term liabilities are believed to approximate fair value as of September 30, 2016 and December 31, 2015, respectively, because of the relatively short duration of these instruments. The Company also assessed long-term debt and determined that such amounts approximated fair value primarily since its terms and interest approximate current market terms and was negotiated with an unrelated third party lender. The Company considers the inputs related to these estimates to be Level 2 fair value measurements. Certain assets and liabilities are recorded at fair value. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability between market participants in an orderly transaction on the measurement date. The market in which the reporting entity would sell the asset or transfer the liability with the greatest volume and level of activity for the asset or liability is known as the principal market. When no principal market exists, the most advantageous market is used. This is the market in which the reporting entity would sell the asset or transfer the liability with the price that maximizes the amount that would be received or minimizes the amount that would be paid. Fair value is based on assumptions market participants would make in pricing the asset or liability. Generally, fair value is based on observable quoted market prices or derived from observable market data when such market prices or data are available. When such prices or inputs are not available, the reporting entity should use valuation models. The Company’s assets recorded at fair value on a recurring basis are categorized based on the priority of the inputs used to measure fair value. Fair value measurement standards require an entity to maximize the use of observable inputs (such as quoted prices in active markets) and minimize the use of unobservable inputs (such as appraisals or other valuation techniques) to determine fair value. The inputs used in measuring fair value are categorized into three levels, as follows: Level 1 Inputs that are based upon quoted prices for identical instruments traded in active markets. Level 2 Inputs that are based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar investments in markets that are not active, or models based on valuation techniques for which all significant assumptions are observable in the market or can be corroborated by observable market data for substantially the full term of the investment. Level 3 Inputs that are generally unobservable and typically reflect management’s estimates of assumptions that market participants would use in pricing the asset or liability. The fair values are therefore determined using model-based techniques that include option pricing models, discounted cash flow models and similar techniques. As of September 30, 2016 and December 31, 2015, the Company has no financial assets or liabilities that are categorized as Level 3. The Company has investments carried at fair value in mutual funds held in a Rabbi Trust, which is included in investments held in Rabbi Trust on the accompanying consolidated balance sheets. The Company does not measure non-financial assets and liabilities at fair value unless there is an event which requires this measurement. The Company’s assets that are exposed to credit risk consist primarily of cash and cash equivalents, investments held in Rabbi Trust and contract receivables. Cash and cash equivalents are deposited with high-credit, quality financial institutions whose balances may, at times, exceed federally insured limits. The Company has not experienced any losses in such amounts and believes that it is not exposed to any significant credit risk on cash and cash equivalents. Investments held in Rabbi Trust are stated at fair value at each reporting period and are subject to market fluctuations. Contract receivables consist primarily of amounts due from various agencies of the federal government or prime contractors doing business with the federal government. Historically, the Company has not experienced significant losses related to contract receivables and, therefore, believes that the credit risk related to contract receivables is minimal. In April 2015, the FASB issued Accounting Standards Update (ASU) 2015-03, Interest Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs 6.36 0.35 0.71 The Company measures compensation expense for stock based equity awards based on the fair value of the awards on the grant date. Compensation is recognized as expense in the accompanying consolidated statements of operations ratably over the required service period or, for performance based awards, when the achievement of the performance targets become probable. Basic net (loss) income per share available to common shareholders of the Company is calculated by dividing the net (loss) income by the weighted average number of common shares outstanding during the year. Common shares issuable upon exercise of the stock options and future vesting of the restricted stock awards (see Note 12) have not been included in the computation because their inclusion would have had an antidilutive effect for all periods presented. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606) In June 2014, the FASB issued ASU 2014-12, CompensationStock Compensation (Topic 718): Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period In August 2014, the FASB issued ASU 2014-15, Presentation of Financial StatementsGoing Concern (Subtopic 205-40): Disclosure of Uncertainties about an Entity's Ability to Continue as a Going Concern In February 2015, the FASB issued ASU 2015-02, Consolidation (Topic 810) Amendments to the Consolidation Analysis In September 2015, the FASB issued ASU 2015-16, Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments In November 2015, the FASB issued ASU 2015-17, Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes 0.6 9.3 8.7 In February 2016, the FASB issued ASU 2016-05, Leases (Topic 842 In March 2016, the FASB issued ASU 2016-08, Revenue from Contracts with Customers (Topic 606) Principal versus Agent Considerations (Reporting Revenue Gross versus Net) (ASU 2016-08) In March 2016, the FASB issued ASU 2016-09, Compensation-Stock Compensation (Topic 718), Improvements to Employee Share-Based Payment Accounting (ASU 2016-09) In April 2016, the FASB issued ASU 2016-10, Revenue from Contracts with Customers (Topic 606), Identifying Performance Obligations and Licensing (ASU 2016-10) In May 2016, the FASB issued ASU 2016-12, Revenue from Contracts with Customers (Topic 606), Narrow-Scope Improvements and Practical Expedients. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments |