Goldfield 10-K 14 Mar 18 2017 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Mar. 09, 2018	Jun. 30, 2017
Document And Entity Information [Abstract] [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Entity Registrant Name	GOLDFIELD CORP
Entity Central Index Key	42,316
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Accelerated Filer
Entity Common Stock, Shares Outstanding		25,451,354
Entity Well-known Seasoned Issuer	No
Entity Public Float			$ 127.6
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 18,529,757	$ 20,599,648
Accounts receivable and accrued billings	21,566,842	19,094,407
Costs and estimated earnings in excess of billings on uncompleted contracts	6,074,346	7,313,099
Income taxes receivable	619,552	533,837
Residential properties under construction	2,412,202	1,552,131
Prepaid expenses	993,668	1,037,715
Other current assets	1,532,110	1,298,044
Total current assets	51,728,477	51,428,881
Property, buildings and equipment, at cost, net of accumulated depreciation of $38,927,654 in 2017 and $33,140,214 in 2016	36,072,300	33,245,947
Deferred charges and other assets
Land and land development costs	4,326,728	4,930,331
Cash surrender value of life insurance	550,335	550,672
Restricted cash	102,027	173,041
Goodwill	101,407	101,407
Intangibles, net of accumulated amortization of $263,134 in 2017 and $201,634 in 2016	750,666	812,166
Other assets	0	59,712
Total deferred charges and other assets	5,831,163	6,627,329
Total assets	93,631,940	91,302,157
Current liabilities
Accounts payable and accrued liabilities	9,379,535	11,386,119
Billings in excess of costs and estimated earnings on uncompleted contracts	166,268	845,057
Current portion of notes payable, net	6,099,787	6,101,855
Accrued remediation costs	87,553	102,526
Total current liabilities	15,733,143	18,435,557
Deferred income taxes	4,698,720	8,204,324
Accrued remediation costs, less current portion	434,164	112,380
Notes payable, less current portion, net	16,151,567	16,231,373
Other accrued liabilities	66,033	67,961
Total liabilities	37,083,627	43,051,595
Commitments and contingencies (notes 4 and 8)	0	0
Stockholders’ equity
Preferred stock, $1 par value, 5,000,000 shares authorized, none issued
Common stock, $.10 par value, 40,000,000 shares authorized; 27,813,772 shares issued and 25,451,354 shares outstanding	2,781,377	2,781,377
Additional paid-in capital	18,481,683	18,481,683
Retained earnings	36,593,440	28,295,689
Treasury stock, 2,362,418 shares, at cost	(1,308,187)	(1,308,187)
Total stockholders’ equity	56,548,313	48,250,562
Total liabilities and stockholders’ equity	$ 93,631,940	$ 91,302,157

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Property, buildings and equipment, accumulated depreciation	$ 38,927,654	$ 33,140,214
Finite-lived intangible assets, accumulated amortization	$ 263,134	$ 201,634
Preferred stock, par value (usd per share)	$ 1	$ 1
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Common stock, par value (usd per share)	$ 0.1	$ 0.1
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	27,813,772	27,813,772
Common stock, shares outstanding	25,451,354	25,451,354
Treasury stock, shares	2,362,418	2,362,418

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Revenue
Electrical construction	$ 109,154,476	$ 125,771,361
Other	4,799,043	4,652,102
Total revenue	113,953,519	130,423,463
Costs and expenses
Electrical construction	86,714,412	93,566,045
Other	3,147,791	3,242,887
Selling, general and administrative	6,611,315	5,913,132
Depreciation and amortization	7,217,901	6,312,164
Loss (gain) on sale of property and equipment	76,810	(17,535)
Total costs and expenses	103,768,229	109,016,693
Total operating income	10,185,290	21,406,770
Other income (expense), net
Interest income	31,696	33,465
Interest expense, net of amount capitalized	(665,268)	(591,176)
Other income, net	57,654	68,465
Total other expense, net	(575,918)	(489,246)
Income from continuing operations before income taxes	9,609,372	20,917,524
Income tax provision	1,035,997	7,809,768
Income from continuing operations	8,573,375	13,107,756
Loss from discontinued operations, net of income tax benefit of $164,235 and $66,077, respectively	(275,624)	(108,007)
Net income	$ 8,297,751	$ 12,999,749
Net income (loss) per share of common stock — basic and diluted
Continuing operations (usd per share)	$ 0.34	$ 0.52
Discontinued operations (usd per share)	(0.01)	0
Net (loss) income (usd per share)	$ 0.33	$ 0.51
Weighted average shares outstanding - basic and diluted (shares)	25,451,354	25,451,354

Consolidated Statements of Inc5

Consolidated Statements of Income (Parenthetical) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Loss from discontinued operations, net of income tax benefit of $164,235 and $66,077, respectively	$ 164,235	$ 66,077

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities
Net income	$ 8,297,751	$ 12,999,749
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	7,217,901	6,312,164
Amortization of debt issuance costs	23,506	23,418
Deferred income taxes	(3,505,604)	649,077
Loss (gain) on sale of property and equipment	76,810	(17,535)
Other losses (gains)	337	(1,072)
Changes in operating assets and liabilities
Accounts receivable and accrued billings	(2,472,435)	(1,844,340)
Costs and estimated earnings in excess of billings on uncompleted contracts	1,238,753	2,979,100
Residential properties under construction	(860,071)	(1,406,681)
Income taxes receivable	(85,715)	(533,837)
Prepaid expenses and other assets	(130,307)	(43,912)
Land and land development costs	603,603	(2,513,242)
Restricted cash	71,014	134,051
Income taxes payable	0	(483,763)
Accounts payable and accrued liabilities	(1,900,088)	1,221,487
Billings in excess of costs and estimated earnings on uncompleted contracts	(678,789)	610,896
Accrued remediation costs	306,811	(28,309)
Net cash provided by operating activities	8,203,477	18,057,251
Cash flows from investing activities
Proceeds from disposal of property and equipment	133,733	263,876
Proceeds from notes receivable	0	56,048
Purchases of property, buildings and equipment	(10,301,721)	(4,989,663)
Net cash used in investing activities	(10,167,988)	(4,669,739)
Cash flows from financing activities
Proceeds from notes payable	22,600,000	4,700,000
Repayments on notes payable	(22,697,255)	(8,840,137)
Debt issuance costs	(8,125)	(21,965)
Net cash used in financing activities	(105,380)	(4,162,102)
Net (decrease) increase in cash and cash equivalents	(2,069,891)	9,225,410
Cash and cash equivalents at beginning of year	20,599,648	11,374,238
Cash and cash equivalents at end of year	18,529,757	20,599,648
Supplemental disclosure of cash flow information
Interest paid, net of amounts capitalized	621,797	548,959
Income taxes paid, net	4,463,081	8,112,214
Supplemental disclosure of non-cash investing
Liability for equipment acquired	$ 57,279	$ 165,703

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($)	Total	Common stock [Member]	Additional paid-in capital [Member]	Retained earnings [Member]	Treasury stock [Member]
Balance (shares) at Dec. 31, 2015		27,813,772
Balance at Dec. 31, 2015	$ 35,250,813	$ 2,781,377	$ 18,481,683	$ 15,295,940	$ (1,308,187)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 12,999,749	$ 0	0	12,999,749	0
Balance (shares) at Dec. 31, 2016	25,451,354	27,813,772
Balance at Dec. 31, 2016	$ 48,250,562	$ 2,781,377	18,481,683	28,295,689	(1,308,187)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 8,297,751	$ 0	0	8,297,751	0
Balance (shares) at Dec. 31, 2017	25,451,354	27,813,772
Balance at Dec. 31, 2017	$ 56,548,313	$ 2,781,377	$ 18,481,683	$ 36,593,440	$ (1,308,187)

Organization and Summary of Sig

Organization and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Summary of Significant Accounting Policies	Organization and Summary of Significant Accounting Policies Overview The Goldfield Corporation (the “Company”) was incorporated in Wyoming in 1906 and subsequently reincorporated in Delaware in 1968. The Company’s principal line of business is the construction of electrical infrastructure for the utility industry and industrial customers. The principal market for the Company’s electrical construction operation is primarily in the Southeast and mid-Atlantic regions of the United States and Texas. Basis of Financial Statement Presentation The accompanying consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation. The Company adopted Accounting Standards Updates (“ASU”) ASU 2011-05 and ASU 2011-12, which require comprehensive income to be reported in either a single statement or in two consecutive statements reporting net income and other comprehensive income. The amendment eliminates the option to report other comprehensive income and its components in the statement of changes in stockholders’ equity. However, comprehensive income is equivalent to net income for the Company, and therefore, the Company’s accompanying financial statements do not include a Statement of Other Comprehensive Income. Cash and Cash Equivalents The Company considers highly liquid investments with maturities of three months or less when purchased to be cash equivalents. Allowance for Doubtful Accounts The allowance for doubtful accounts is the Company’s best estimate of the amount of probable credit losses in the Company’s existing accounts receivable. The Company determines the allowance based on customer specific information and historical write-off experience. The Company reviews its allowance for doubtful accounts quarterly. Account balances are charged off against the allowance after reasonable means of collection have been exhausted and the potential for recovery is considered remote. As of both December 31, 2017 and 2016 , upon its review, management determined it was not necessary to record an allowance for doubtful accounts due to the majority of accounts receivable being generated by electrical utility customers who the Company considers creditworthy based on timely collection history and other considerations. Property, Buildings, Equipment and Depreciation Property, buildings and equipment are stated at cost. Depreciation on property, buildings and equipment is calculated on the straight-line method over the estimated useful lives of the assets. Leasehold improvements are depreciated on a straight-line basis over the shorter of the lease term, including renewals that are deemed to be reasonably assured, or the estimated useful life of the improvement. In accordance with Accounting Standard Codification (“ASC”) ASC Topic 360-10-05, Accounting for the Impairment or Disposal of Long-Lived Assets , the Company assesses the need to record impairment losses on long-lived assets when events and circumstances indicate that the carrying amount of an asset may not be recoverable. An impairment loss would be recognized when future estimated undiscounted cash flows expected to result from use of the asset are less than the asset’s carrying value. Any resulting loss would be measured at fair value based on discounted expected cash flows. Electrical Construction Revenue The Company accepts contracts on a fixed-price, unit-price and service agreement basis. Revenue from fixed-price construction contracts are recognized on the percentage-of-completion method, measured by the ratio of costs incurred to date, to the estimated total costs to be incurred for each contract. Revenue from unit-price contracts is recognized on either the percentage-of-completion method or a man-hour or man-hour plus equipment basis. Revenue from service agreements are recognized as services are performed. Revenue from service agreements are billed on either a man-hour or man-hour plus equipment basis. Terms of the Company’s service agreements may extend for periods beyond one year. The Company’s contracts allow it to bill additional amounts for change orders and claims. The Company considers a claim to be for additional work performed outside the scope of the contract and contested by the customer. Historically, claims relating to electrical construction work have not been significant. A change order is a modification to a contract that changes the provisions of the contract, typically resulting from changes in scope, specifications, design, manner of performance, facilities, equipment, materials, sites, or period of completion of the work under the contract. It is the Company’s policy to include revenue from change orders in contract value only when they can be reliably estimated and realization is considered probable, in accordance with ASC Topic 605-35-25-30 and ASC Topic 605-35-25-31, Revenue Recognition for Construction Type Contracts . The asset, “costs and estimated earnings in excess of billings on uncompleted contracts” represents revenue recognized in excess of amounts billed. The liability, “billings in excess of costs and estimated earnings on uncompleted contracts” represents billings in excess of revenue recognized. Contract costs include all direct material, direct labor, subcontractor costs and indirect costs related to contract performance, such as supplies, tools and equipment maintenance. General and administrative costs are charged to expense as incurred. Provisions for estimated losses on uncompleted contracts are made in the period in which such losses are determined. Changes in job performance, job conditions, estimated profitability and final contract settlements may result in revisions to costs and income and are recognized in the period in which the revisions are determined. Land and Land Development Costs and Residential Properties Under Construction The costs of a land purchase and any development expenses up to the initial construction phase of any residential property development project are recorded under the asset “land and land development costs.” Once construction commences, both the land development costs and construction costs are recorded under the asset “residential properties under construction.” The assets “land and land development costs” and “residential properties under construction” relating to specific projects are recorded as current assets when the estimated project completion date is less than one year from the date of the consolidated financial statements, or as non-current assets when the estimated project completion date is one year or more from the date of the consolidated financial statements. In accordance with ASC Topic 360-10, Accounting for the Impairment or Disposal of Long-lived Assets , land and residential properties under construction are reviewed by the Company for impairment whenever events or changes in circumstances indicate that the carrying value may not be recoverable. If the carrying amount or basis is not expected to be recovered, impairment losses are recorded and the related assets are adjusted to their estimated fair value. The fair value of an asset is the amount at which that asset could be bought or sold in a current transaction between willing parties, that is, other than in a forced or liquidation sale. The Company also complies with ASC Topic 820, Fair Value Measurement , which defines fair value, establishes a framework for measuring fair value, and expands disclosures about fair value measurements. The Company did not record an impairment write-down to either of its land carrying value or residential properties under construction carrying value for either the years ended December 31, 2017 or 2016 . Income Taxes The Company accounts for income taxes in accordance with ASC Topic 740, Income Taxes, which establishes the recognition requirements. Deferred tax assets and liabilities are recognized for the future tax effects attributable to temporary differences and carryforwards between the financial statement carrying amounts of existing assets and liabilities and the respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. The Company recognizes the effect of income tax positions only if those positions are more likely than not of being sustained. Recognized income tax positions are measured at the largest amount that is greater than 50% likely of being realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs. The Company records interest and penalties related to unrecognized tax benefits as interest expense and other general and administrative expenses, respectively, and not as a component of income taxes. Executive Long-term Incentive Plan The Company has not issued shares pursuant to The Goldfield Corporation 2013 Long-term Incentive Plan (the “2013 Plan”) in either 2017 or 2016 . Therefore, the Company has no compensation expense for shares pursuant to the 2013 Plan for either of the years ended December 31, 2017 or 2016 . Use of Estimates Management of the Company has made a number of estimates and assumptions relating to the reporting of assets and liabilities and the disclosure of contingent assets and liabilities to prepare these consolidated financial statements in conformity with U.S. generally accepted accounting principles (“GAAP”). Actual results could differ from those estimates. Management considers the most significant estimates in preparing these consolidated financial statements to be the estimated cost to complete electrical construction contracts in progress, the adequacy of the accrued remediation costs and the realizability of deferred tax assets. Fair Value of Financial Instruments The Company’s financial instruments include cash and cash equivalents, accounts receivable and accrued billings, restricted cash collateral deposited with insurance carriers, cash surrender value of life insurance policies, accounts payable, notes payable, and other current liabilities. Fair value is the price that would be received to sell an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The fair value guidance establishes a valuation hierarchy, which requires maximizing the use of observable inputs when measuring fair value. The three levels of inputs that may be used are: Level 1 - Quoted market prices in active markets for identical assets or liabilities. Level 2 - Observable market based inputs or other observable inputs. Level 3 - Significant unobservable inputs that cannot be corroborated by observable market data. These values are generally determined using valuation models incorporating management’s estimates of market participant assumptions. Fair values of financial instruments are estimated through the use of public market prices, quotes from financial institutions, and other available information. Management considers the carrying amounts reported on the consolidated balance sheets for cash and cash equivalents, accounts receivable and accrued billings, accounts payable and accrued liabilities, to approximate fair value due to the immediate or short-term maturity of these financial instruments. The Company’s carrying value of long-term notes payable are estimated by management to approximate fair value since the interest rates prescribed by Branch Banking and Trust Company (the “Bank”) are variable market interest rates and are adjusted periodically, and as such, are classified as Level 2. Restricted cash is considered by management to approximate fair value due to the nature of the asset held in a secured interest bearing bank account. The carrying value of cash surrender value of life insurance is also considered by management to approximate fair value as the carrying value is based on the current settlement value under the contract, as provided by the carrier and as such, is classified as Level 2. Restricted Cash The Company’s restricted cash includes cash deposited in a secured interest bearing bank account, as required by the Collateral Trust Agreement in connection with the Company’s workers’ compensation insurance policies, as described in note 12. Goodwill and Intangible Assets Intangible assets with finite useful lives recorded in connection with a historical acquisition are amortized over the term of the related contract or useful life, as applicable. Intangible assets held by the Company with finite useful lives include customer relationships and trademarks. The Company reviews the values recorded for intangible assets and goodwill to assess recoverability from future operations annually or whenever events or changes in circumstances indicate that their carrying amounts may not be recoverable. As of December 31, 2017 , the Company assessed the recoverability of its long-lived assets and goodwill, and believed that there were no events or circumstances present that would require a test of recoverability on those assets. As a result, there was no impairment of the carrying amounts of such assets. Segment Reporting The Company operates as a single reportable segment, electrical construction, under ASC Topic 280-10-50 Disclosures about Segments of an Enterprise and Related Information . The Company’s real estate development operations are not significant for reporting purposes and, accordingly, results of the ongoing real estate development operations are included in the income statement under the caption “Other.” Certain corporate costs are not allocated to the electrical construction segment. Reclassifications Certain amounts previously reflected on the prior year cash flows from operating activities include amounts under contract loss accruals now included under Accounts payable and accrued liabilities. This reclassification had no effect on the previously reported total of cash flows from operating activities. Recent Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (the “FASB”) issued ASU 2014-09, which will replace most existing revenue recognition guidance in U.S. generally accepted accounting principles. The amendments under this pronouncement will change when and how an entity recognizes revenue from contracts it enters to transfer goods, services or non-financial assets to its customers. The new guidance creates a comprehensive framework for all entities in all industries to apply when determining when and how to recognize revenue. This new guidance supersedes virtually all existing revenue recognition requirements and guidance. This framework is expected to result in less complex guidance in application while providing a consistent and comparable methodology for revenue recognition. The core principle of ASU 2014-09 is that an entity should recognize revenue for the transfer of goods or services equal to the amount that it expects to be entitled to receive for those goods or services. ASU 2014-09 also requires additional disclosures about the nature, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments. ASU 2014-09 allows for either retrospective or cumulative effect transition methods of adoption and is effective for periods beginning after December 15, 2016. In August 2015, the FASB issued ASU 2015-14 which provides a one-year deferral of the revenue recognition standard’s effective date. Public business entities are required to apply the revenue recognition standard to annual reporting periods beginning after December 15, 2017, and interim periods within those annual periods. Under the new standard ASC Topic 606 Revenue from Contracts from Customers , electrical construction fixed-price contracts, currently accounted for under ASC Topic 605-35, will be recognized over time as services are performed and the underlying obligation to the customer is fulfilled. Generally, this will result in the use of input measures on a cost to cost basis, similar to the practices currently in place for contracts accounted for under ASC Topic 605-35. The Company has assessed that under the new guidance the primary impact will be on the timing of when and how contract modifications and change orders are recognized. Currently, contract modifications, change orders and variable consideration are generally included in total contract value when executed by the customer as compared to the new guidance, when legally enforceable and estimable. This may result in timing differences on the recognition of revenue and profit when compared to the Company’s current practices. Additionally, under ASC Topic 605-35 the Company’s contract modifications, change orders and variable consideration have historically been accounted for on a cumulative catch up basis. While this methodology is still applicable under the new standard, modifications, change orders and variable consideration need to be evaluated to determine whether distinct goods and services are being added to the contract or if they are distinct from the goods already transferred. The treatment of contract modifications, change orders and variable consideration on a contract by contract basis under the new standard could be different and have an impact on the timing of individual project revenue and profit. The Company has also determined there will not be material changes in the pattern of revenue recognition for electrical construction contracts, which are currently accounted for on a time and materials basis. These contracts will be treated as a series of distinct services transferred over time and will generally result in a similar revenue pattern when compared to our current accounting policies. The Company estimates that there will not be material changes in the pattern of revenue recognition for real estate development operations, which are presented under the caption “Other” in the consolidated financial statements. The Company will continue to recognize revenue upon the transfer of control of the promised real estate properties, generally at time of closing. When this pronouncement is adopted in 2018, the Company will adopt all amendments under this ASU using the cumulative effect transition method. The Company will apply this guidance to contracts with customers that were not substantially complete as of January 1, 2018 and will be effective for the quarter ending March 31, 2018. The Company’s financial results for reporting periods after January 1, 2018 will be presented under the new guidance, while financial results from prior periods will continue to be reported in accordance with the prior guidance and the Company's historical accounting policies. The Company has substantially completed its evaluation of the impact of the new guidance on its contracts with customers, including the identification of differences that may result from the new requirements, the most significant of which are discussed above. The Company does not expect this update to have a material effect on the Company’s results of operations, financial position or cash flows. This conclusion is based on the Company’s continued evaluation of on-going contracts, its understanding of historical contracts with its customers and its evaluation of contracts under the cumulative effect transition method. The Company expects its disclosures related to revenue recognition will expand to address new quantitative and qualitative requirements regarding the nature, amount and timing of revenue from contracts with customers and additional information related to contract assets and liabilities. The Company has identified and is in the final stages of implementing changes to its processes and internal controls to meet the reporting and disclosure requirements of this update. In May 2016, the FASB issued ASU 2016-12, which improves guidance on assessing collectability, presentation of sales taxes, non-cash consideration, and completed contracts and contract modifications at transition. The FASB has also issued the following standards which clarify ASU 2014-09 and have the same effective date as the original standard: ASU 2016-20, ASU 2016-10 and ASU 2016-08. These updates are effective concurrently with ASU 2014-09 and the Company does not expect the adoption of this new guidance to have a material impact on the Company’s consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, to increase transparency and comparability among organizations by recognizing all lease transactions (with terms in excess of 12 months) on the balance sheet as a lease liability and a right-of-use asset (as defined). ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, with earlier application permitted. Upon adoption, the lessee will apply the new standard retrospectively to all periods presented or retrospectively using a cumulative effect adjustment in the year of adoption. The Company expects this new guidance to cause a material increase to the assets and liabilities on the Company’s consolidated balance sheets. The Company is currently assessing the effect the adoption will have on its consolidated financial statements of income. The impact of this ASU is non-cash in nature, therefore the Company does not expect the adoption of this new guidance to have a material impact on the Company’s cash flows or liquidity. In August 2016, the FASB issued ASU 2016-15, which provides clarification regarding how certain cash receipts and cash payments are presented and classified in the statement of cash flows. This update addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice. In addition, in November 2016, the FASB issued ASU 2016-18, which requires that amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. Both updates are effective for annual and interim periods beginning after December 15, 2017, with early adoption permitted. The Company will adopt this guidance as of January 1, 2018 and does not expect the adoption will have a material impact on its consolidated financial statements. In October 2016, the FASB issued ASU 2016-16, which eliminates the requirement to defer the recognition of current and deferred income taxes for an intra-entity asset transfer until the asset has been sold to an outside party. Under the new guidance, an entity should recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. This update is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years; early adoption is permitted and is to be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings at the time of adoption. The Company will adopt this guidance as of January 1, 2018 and does not expect the adoption of this guidance to have a material impact on its consolidated financial statements. In January 2017, the FASB issued ASU 2017-04, which eliminates Step 2 of the current goodwill impairment test. A goodwill impairment loss will instead be measured at the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the recorded amount of goodwill allocated to that reporting unit. The provisions of this ASU are effective for years beginning after December 15, 2019, with early adoption permitted for any impairment test performed on testing dates after January 1, 2017. The Company is currently assessing the impact that adoption will have on its consolidated financial statements, however, the Company does not expect this ASU to have a significant impact on its consolidated financial statements or disclosures.

Costs and Estimated Earnings on

Costs and Estimated Earnings on Uncompleted Contracts	12 Months Ended
	Dec. 31, 2017
Contractors [Abstract]
Costs and Estimated Earnings on Uncompleted Contracts	Costs and Estimated Earnings on Uncompleted Contracts Long-term fixed-price electrical construction contracts in progress accounted for using the percentage-of-completion method as of December 31 for the years as indicated: 2017 2016 Costs incurred on uncompleted contracts $ 48,681,608 $ 47,282,570 Estimated earnings 16,076,125 18,644,216 64,757,733 65,926,786 Less billings to date 58,849,655 59,458,744 Total $ 5,908,078 $ 6,468,042 Included in the consolidated balance sheets under the following captions Costs and estimated earnings in excess of billings on uncompleted contracts $ 6,074,346 $ 7,313,099 Billings in excess of costs and estimated earnings on uncompleted contracts (166,268 ) (845,057 ) Total $ 5,908,078 $ 6,468,042 The amounts billed but not paid by customers pursuant to retention provisions of long-term electrical construction contracts were $3.3 million and $3.2 million as of December 31, 2017 and 2016 , respectively, and are included in the accompanying consolidated balance sheets in accounts receivable and accrued billings. Retainage is expected to be collected within the next twelve months.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes On December 22, 2017, the President signed into law the Tax Cuts and Jobs Act (the “Tax Act”). The Tax Act significantly revises the U.S. tax code by, among other items, reducing the federal corporate tax rate from its highest rate of 35% to a single rate of 21%, providing for the full expensing of certain depreciable property, limiting the deductibility of interest expense, further limiting the deductibility of certain executive compensation, and limiting the use of net operating loss carryforwards created in tax years beginning after December 31, 2017. Generally accepted accounting principles require companies to record the impact of the Tax Act in their financial statements for the period during which the Tax Act becomes law, even if provisions of the Tax Act become effective at a future date. The Securities and Exchange Commission (“SEC”) staff recently issued Staff Accounting Bulletin (“SAB”) 118, Income Tax Accounting Implications of the Tax Cuts and Jobs Act, which provides guidance on accounting for the effects and includes a measurement period that ends when a company has obtained, prepared and analyzed the information necessary to finalize its accounting of the Tax Act which cannot extend beyond one year. In accordance with SAB 118, a company must reflect the income tax effects of those aspects of the Tax Act for which the accounting under ASC 740, Income Taxes, is complete. To the extent that a company’s accounting for certain income tax effects of the Tax Act is incomplete, but it is able to determine a reasonable estimate, it must record a provisional estimate in the financial statements. If a company cannot determine a provisional estimate to be included in the financial statements, it should continue to apply ASC 740 on the basis of the provisions of the tax laws that were in effect immediately before the enactment of the Tax Act. The Company’s accounting for the following elements of the Tax Act are complete. However, these estimates may be affected by additional analysis and are subject to change due to a variety of factors, including, among others: (i) management’s further assessment of the Tax Act and related regulatory guidance; (ii) further guidance that may be issued by the Treasury, Financial Accounting Standards Board, SEC, Internal Revenue Service, or state, local or other taxing authorities; and (iii) actions the Company may take as a result of the Tax Act. Re-measurement of Net Deferred Tax Liability: As a result of the Company’s net deferred tax liability position, a one-time income tax benefit of $2.5 million for the year ended December 31, 2017 was recorded as a result of the reduction in the federal corporate tax rate. Cost Recovery: The Company has completed a full analysis of its 2017 capital expenditures that qualify for immediate expensing and has recorded a benefit for bonus depreciation that resulted in a decrease of approximately $140,000 to current income taxes and a corresponding increase in our deferred tax liabilities (after considering the effects of the reduction in the federal corporate tax rate). The full expensing was only effective for certain depreciable property placed in service after September 27, 2017. The Company believes the impact of certain provisions in the Tax Act, such as the limitation on interest expense deductibility, the limitation on the deductibility of certain executive compensation and net operating loss carryforwards will be immaterial. The following table presents the income tax provision from continuing operations for the years ended December 31 as indicated: 2017 2016 Current Federal $ 3,863,151 $ 6,157,900 State 558,993 1,014,213 4,422,144 7,172,113 Deferred Federal (3,270,928 ) 570,770 State (115,219 ) 66,885 (3,386,147 ) 637,655 Total $ 1,035,997 $ 7,809,768 The following table presents the total income tax provision for the years ended December 31 as indicated: 2017 2016 Income tax provision $ 1,035,997 $ 7,809,768 Discontinued operations (164,235 ) (66,077 ) Total $ 871,762 $ 7,743,691 The following table presents the temporary differences and carryforwards, which give rise to deferred tax assets and liabilities as of December 31 as indicated: 2017 2016 Deferred tax assets Accrued vacation $ 113,893 $ 146,215 Acquisition costs capitalized 58,886 98,484 Accrued remediation costs 130,168 80,100 Accrued payables 174,674 122,235 Percentage completed contract method for tax 276,413 — Accrued workers’ compensation 159,237 127,033 Capitalized bidding costs 121,227 8,846 Inventory adjustments 139,565 133,991 Accrued lease expense 17,902 32,683 Accrued contract losses 50,220 89 Other 4,103 5,214 Total deferred tax assets 1,246,288 754,890 Deferred tax liabilities Tax amortization in excess of financial statement amortization (10,850 ) (12,156 ) Tax depreciation in excess of financial statement depreciation (5,934,158 ) (8,947,058 ) Total deferred tax liabilities (5,945,008 ) (8,959,214 ) Total net deferred tax liabilities $ (4,698,720 ) $ (8,204,324 ) As of December 31, 2017 , the non-current deferred tax liabilities decreased to $4.7 million from $8.2 million as of December 31, 2016 due to the re-measurement of the Company’s net deferred tax liability position at the new tax rate of 21% under the Tax Act. The carrying amounts of deferred tax assets are reduced by a valuation allowance, if based on the available evidence, it is more likely than not such assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which the deferred tax assets are expected to be recovered or settled. In the assessment for a valuation allowance, appropriate consideration is given to all positive and negative evidence related to the realization of the deferred tax assets. This assessment considers, among other matters, the nature, frequency and severity of current and cumulative losses, forecasts of future profitability and tax planning alternatives. If the Company determines it will not be able to realize all or part of the deferred tax assets, a valuation allowance would be recorded to reduce deferred tax assets to the amount that is more likely than not to be realized. Based on assumptions with respect to forecasts of future taxable income and tax planning strategies, among others, the Company anticipates being able to generate sufficient taxable income to utilize the deferred tax assets. Therefore, the Company has not recorded a valuation allowance against deferred tax assets. The minimum amount of future taxable income required to be generated to fully realize the deferred tax assets, applying the new Tax Act federal rate of 21%, as of December 31, 2017 is approximately $5.0 million . The following table presents the differences between the Company’s effective income tax rate and the federal statutory rate on income from continuing operations for the years ended December 31 as indicated: 2017 2016 Federal statutory rate 34.0% 35.0% State tax rate, net of federal tax 3.1 3.3 Nondeductible expenses 3.6 1.6 Domestic production activities deduction (4.0) (3.2) Tax Act rate change (26.0) — Other 0.1 0.6 Total 10.8% 37.3% The Company had gross unrecognized tax benefits of $5,000 as of both December 31, 2017 and 2016 . The Company believes that it is reasonably possible that the liability for unrecognized tax benefits related to certain state income tax matters may be settled within the next twelve months. The federal statute of limitation has expired for tax years prior to 2014 and relevant state statutes vary. The Company is currently not under any income tax audits or examinations and does not expect the assessment of any significant additional tax in excess of amounts provided. The following table presents a reconciliation of the beginning and ending amounts of unrecognized tax benefits for the years as indicated: 2017 2016 Balance as of January 1 $ 4,723 $ 4,723 Increase from current year tax positions — — Decrease from settlements with taxing authority — — Balance as of December 31 $ 4,723 $ 4,723 The Company accrues interest and penalties related to unrecognized tax benefits as interest expense and other general and administrative expenses, respectively, and not as a component of income taxes. Decreases in interest and penalties are due to settlements with taxing authorities and expiration of statutes of limitation. During the years ended December 31, 2017 and 2016 , the Company recognized $1,000 each year in interest and penalties. The Company had accrued as a current liability $9,000 and $8,000 for the future payment of interest and penalties as of December 31, 2017 and 2016 , respectively.

Discontinued Operations

Discontinued Operations	12 Months Ended
	Dec. 31, 2017
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	Discontinued Operations Commitments and Contingencies Related to Discontinued Operations Discontinued operations represent former mining activities, the last of which ended in 2002. Pursuant to an agreement with the United States Environmental Protection Agency (the “EPA”), the Company performed certain remediation actions at a property sold over fifty years ago. This remediation work was completed by September 30, 2015. The Company has established a contingency provision related to discontinued operations, which was $522,000 and $215,000 , respectively, including an increase of $440,000 and $174,000 ( $276,000 and $108,000 , net of tax benefit of $164,000 and $66,000 , respectively) recognized for the years ended December 31, 2017 and 2016 , respectively. The increase for both the years ended December 31, 2017 and 2016 , resulted mainly from changes in the scope of the project as required by the EPA and the state of Washington. The remaining balance of the accrued remediation costs as of December 31, 2017 , mainly represents estimated future charges for EPA response costs and monitoring and provisions for potential future remediation efforts of the property as required by the state of Washington. The total costs to be incurred in future periods may vary from this estimate. The provision will be reviewed periodically based upon facts and circumstances available at the time. The costs provisioned for future expenditures related to this environmental obligation are not discounted to present value.

Property, Buildings and Equipme

Property, Buildings and Equipment	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Property, Buildings and Equipment	Property, Buildings and Equipment The following table presents the balances of major classes of properties as of December 31 as indicated: Estimated useful lives in years 2017 2016 Land — $ 530,221 $ 371,228 Land improvements 7 - 15 495,484 470,754 Buildings and improvements 5 - 40 2,588,053 2,155,578 Leasehold improvements 7 - 39 252,646 252,646 Machinery and equipment 2 - 10 70,892,181 62,955,883 Construction in progress — 241,369 180,072 Total 74,999,954 66,386,161 Less accumulated depreciation 38,927,654 33,140,214 Net properties, buildings and equipment $ 36,072,300 $ 33,245,947 Management reviews the net carrying value of all properties, buildings and equipment on a regular basis to assess and determine whether trigger events of impairment exist and the need for possible impairments. As a result of such review, no impairment write-down was considered necessary for the years ended December 31, 2017 and 2016 .

401 (k) Employee Benefits Plan

401 (k) Employee Benefits Plan	12 Months Ended
	Dec. 31, 2017
Retirement Benefits [Abstract]
401 (k) Employee Benefits Plan	401(k) Employee Benefits Plan Effective January 1, 1995, the Company adopted The Goldfield Corporation and Subsidiaries Employee Savings and Retirement Plan, a defined contribution plan that qualifies under Section 401(k) of the Internal Revenue Code. The plan provides retirement benefits to all employees who meet eligibility requirements and elect to participate. Under the plan, participating employees may defer up to 75% of their pre-tax compensation per calendar year subject to Internal Revenue Code limits. The Company’s contributions to the plan are discretionary and amounted to approximately $297,000 and $286,000 for the years ended December 31, 2017 and 2016 , respectively.

Notes Payable

Notes Payable	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Notes Payable	Notes Payable The following table presents the balances of our notes payables as of December 31 as indicated: Branch Banking and Trust Company Maturity Date 2017 2016 Interest Rates 2017 2016 Working Capital Loan November 28, 2019 $ 2,750,000 $ 3,950,000 3.38 % 2.44 % $22.6 Million Equipment Loan March 9, 2021 $ 19,540,000 $ — 3.25 % — % $10.0 Million Equipment Loan July 28, 2020 — 7,579,630 — % 2.81 % $17.0 Million Equipment Loan March 6, 2020 — 9,601,000 — % 2.50 % $2.0 Million Equipment Loan March 6, 2020 — 1,256,625 — % 2.50 % Total notes payable 22,290,000 22,387,255 Less unamortized debt issuance costs 38,646 54,027 Total notes payable, net 22,251,354 22,333,228 Less current portion of notes payable, net 6,099,787 6,101,855 Notes payable net, less current portion $ 16,151,567 $ 16,231,373 As of December 31, 2017 , the Company, and the Company’s wholly owned subsidiaries Southeast Power, Pineapple House of Brevard, Inc. (“Pineapple House”), Bayswater Development Corporation (“Bayswater”), Power Corporation of America (“PCA”) Precision Foundations, Inc. (“PFI”) and C and C Power Line, Inc. (“C&C”), collectively (the “Debtors,”) were parties to a Master Loan Agreement, dated June 9, 2017 (the “2017 Master Loan Agreement”), with Branch Banking and Trust Company (the “Bank”). On June 9, 2017, the Company and the Debtors entered into the $22.6 Million Equipment Loan agreement. Borrowings of $15.6 million from the $22.6 Million Equipment Loan were used to pay in full all the outstanding Bank equipment loans, with the exception of the Working Capital Loan, plus accrued interest and loan closing costs. As of December 31, 2017 , the Company had a loan agreement and a series of related ancillary agreements with the Bank providing for a revolving line of credit loan for a maximum principal amount of $18.0 million , to be used as a “ Working Capital Loan .” As of December 31, 2017 and December 31, 2016 , borrowings under the Working Capital Loan were $2.8 million and $4.0 million , respectively. As a credit guaranty to the Bank, the Company is contingently liable for the guaranty of a subsidiary obligation under an irrevocable letter of credit related to workers’ compensation. As of both December 31, 2017 and December 31, 2016 , the Company had $420,000 for this irrevocable letter of credit related to workers’ compensation. As of December 31, 2017 , the Debtors had a loan agreement with the Bank for the $22.6 Million Equipment Loan , which is guaranteed by the Debtors and include the grant of a continuing security interest in all now owned and after acquired and wherever located personal property of the Debtors. The Working Capital Loan and the $22.6 Million Equipment Loan bear interest at a rate per annum equal to one month LIBOR (as defined in the documentation related to each loan) plus 1.80% , which will be adjusted monthly and subject to a maximum rate of 24.00% . The Company’s debt arrangements contain various financial and other covenants including, but not limited to: minimum tangible net worth, maximum debt to tangible net worth ratio and fixed charge coverage ratio. Other loan covenants prohibit, among other things, a change in legal form of the Company, and entering into a merger or consolidation. The loans also have cross-default provisions whereby any default under any loans of the Company (or its subsidiaries) with the Bank, will constitute a default under all of the other loans of the Company (and its subsidiaries) with the Bank. The schedule of payments of the notes payable as of December 31, 2017 is as follows: 2018 $ 6,120,000 2019 8,870,000 2020 6,120,000 2021 1,180,000 Total payments of debt $ 22,290,000

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Operating Leases The Company leases its principal office space under a nine -year operating lease. Within the provisions of the office lease, there are escalations in payments over the base lease term, as well as renewal periods and cancellation provisions. The effects of the escalations have been reflected in rent expense on a straight-line basis over the expected lease term. In addition, the Company leases other office spaces as principal offices for our subsidiaries PCA and C&C. The Company also leases office equipment under operating leases that expire over the next four years. The Company’s leases require payments of property taxes, insurance and maintenance costs in addition to the rent payments. Additionally, the Company leases several off-site storage facilities, used to store equipment and materials, under a month to month lease arrangement. Lastly, the Company has several lease agreements to lease certain equipment from time to time over a 60 -month term. The leased equipment is used in our electrical construction operations. The Company recognizes rent expense on a straight-line basis over the expected lease term. Future minimum lease payments under operating leases having initial or remaining non-cancelable lease terms in excess of one year as of December 31, 2017 are as follows: 2018 $ 4,636,362 2019 3,570,048 2020 837,971 2021 and beyond 7,999 Total minimum operating lease payments $ 9,052,380 Total expense for the operating leases were $4.7 million and $4.8 million for the years ended December 31, 2017 and 2016 , respectively. Performance Bonds In certain circumstances, the Company is required to provide performance bonds to secure its contractual commitments. Management is not aware of any performance bonds issued for the Company that have ever been called by a customer. As of December 31, 2017 , outstanding performance bonds issued on behalf of the Company’s electrical construction subsidiaries amounted to approximately $58.2 million . Collective Bargaining Agreements C&C, one of the Company’s electrical construction subsidiaries, is party to collective bargaining agreements with unions representing workers performing field construction operations. The collective bargaining agreements expire at various times and have typically been renegotiated and renewed on terms similar to the ones contained in the expiring agreements. The agreements require the subsidiary to pay specified wages, provide certain benefits to their respective union employees and contribute certain amounts to multi-employer pension plans and employee benefit trusts. The subsidiary’s multi-employer pension plan contribution rates generally are specified in the collective bargaining agreements (usually on an annual basis), and contributions are made to the plans on a “pay-as-you-go” basis based on such subsidiary’s union employee payrolls, which cannot be determined for future periods because contributions depend on, among other things, the number of union employees that such subsidiary employs at any given time; the plans in which it may participate vary depending on the projects it has ongoing at any time; and the need for union resources in connection with those projects. If the subsidiary withdraws from, or otherwise terminates its participation in, one or more multi-employer pension plans, or if the plans were to otherwise become substantially underfunded, such subsidiary could be assessed liabilities for additional contributions related to the underfunding of these plans. The Company is not aware of any amounts of withdrawal liability that have been incurred as a result of a withdrawal by C&C from any multi-employer defined benefit pension plans. Multi-employer Pension Plans The Company contributes to a multi-employer pension plan on behalf of employees covered by collective bargaining agreements. These plans are administered jointly by management and union representatives and cover substantially all full-time and certain part-time union employees who are not covered by other plans. The risks of participating in multi-employer plans are different from single-employer plans in the following aspects: (1) assets contributed to the multi-employer plan by one employer may be used to provide benefits to employees of other participating employers, (2) if a participating employer stops contributing to the plan, the unfunded obligations of the plan may be borne by the remaining participating employers, and (3) if the Company chooses to stop participating in a multi-employer plan, we could, under certain circumstances, be liable for unfunded vested benefits or other expenses of jointly administered union/management plans. At this time, we have not established any liabilities because withdrawal from these plans is not probable. For the years ended December 31, 2017 and 2016 , the contributions to these plans were $180,000 and $176,000 , respectively. The Company’s participation in multi-employer pension plans is outlined in the table below. The EIN column provides the Employer Identification Number (“EIN”) of the plan. Unless otherwise noted, the most recent Pension Protection Act zone status available in 2017 and 2016 is for the plan’s year ended December 31, 2017 , and 2016 , respectively. The zone status is based on information that the Company received from the plan, and is certified by the plan’s actuary. Among other factors, plans in the red zone are generally less than 65% funded, plans in the yellow zone are less than 80% funded, and plans in the green zone are at least 80% funded. The “FIP” column indicates plans for which a financial improvement plan (“FIP”) is either pending or has been implemented. The last column lists the expiration date(s) of the collective-bargaining agreement(s) to which the plans are subject. There have been no significant changes in the number of Company employees covered by the multi-employer plans or other significant events that would impact the comparability of contributions to the plans. Information about the Plan is publicly available on Form 5500, Annual Return / Report of Employee Benefit Plan. The Plan year-end is December 31st and no single employer contributes 5% or more of total plan contributions. Certified Zone Status Plan Name: EIN Number Plan Number 2017 2016 FIP Implemented Surcharge Imposed Expiration Date of Collective Bargaining Agreement National Electrical Benefit Fund 53-0181657 001 Green Green Not applicable (green-zone plan) Not applicable (green-zone plan) August 31, 2019 Committed Expenditures The Company from time to time commits to various contractual agreements that secure future rights to goods, services and other items to be used in the normal course of operations. These commitments include capital equipment purchases, sub-contractor services for the construction of residential properties and land purchases for the future construction of residential properties. The following table presents the Company’s committed expenditures as of December 31, 2017 : 2018 $ 2,871,492 2019 369,069 2020 128,244 2021 and beyond 64,122 Total committed expenditures $ 3,432,927 Legal Proceedings The Company is involved in various legal claims arising in the ordinary course of business. The Company has concluded that the ultimate disposition of these matters should not have a material adverse effect on the Company’s consolidated financial position, results of operations, or liquidity.

Income Per Share of Common Stoc

Income Per Share of Common Stock	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Income Per Share of Common Stock	Income Per Share of Common Stock Basic income per common share is computed by dividing net income by the weighted average number of common stock shares outstanding during the period. Diluted income per share reflects the potential dilution that could occur if common stock equivalents, such as stock options outstanding, were exercised into common stock that subsequently shared in the earnings of the Company. As of December 31, 2017 and 2016 , the Company had no common stock equivalents. The computation of the weighted average number of common stock shares outstanding excludes 2,362,418 shares of Treasury Stock for each of the years ended December 31, 2017 and 2016 .

Common Stock Repurchase Plan

Common Stock Repurchase Plan	12 Months Ended
	Dec. 31, 2017
Common Stock Repurchase Plan [Abstract]
Common Stock Repurchase Plan	Common Stock Repurchase Plan The Company has had a stock repurchase plan since September 17, 2002 , when the Board of Directors approval was announced. As last amended by the Board of Directors on September 21, 2017 , this plan permits the purchase of up to 3,500,000 shares. There is currently available for purchase through September 30, 2018 , a maximum of 1,154,940 shares. The Company may repurchase its shares either in the open market or through private transactions. The volume of the shares to be repurchased is contingent upon market conditions and other factors. No shares were repurchased during the years ended December 31, 2017 and December 31, 2016 . As of December 31, 2017 , the total number of shares repurchased under the Repurchase Plan was 2,345,060 at a cost of $1,289,467 (average cost of $0.55 per share). The Company currently holds the repurchased stock as Treasury Stock, reported at cost. Prior to September 17, 2002 , the Company had 17,358 shares of Treasury Stock that it had purchased at a cost of $18,720 .

Business Concentration and Cred

Business Concentration and Credit Risks	12 Months Ended
	Dec. 31, 2017
Risks and Uncertainties [Abstract]
Business Concentration and Credit Risks	Business Concentration and Credit Risks Credit Risks Financial instruments, mainly within the electrical construction operations, which potentially subject the Company to concentrations of credit risk, consist principally of accounts receivable and accrued billings in the amounts of $21.6 million and $19.1 million as of December 31, 2017 and 2016 , respectively, which management reviews to assess the need to establish an allowance for doubtful accounts. Cash and Cash Equivalents The Company holds cash on deposit in U.S. banks, in excess of Federal Deposit Insurance Corporation insurance limits. The Company has not experienced and does not anticipate any losses in any such accounts. The Company mitigates this risk by doing business with well capitalized, quality financial institutions. Customer Concentration Revenue (in thousands of dollars) to customers exceeding 10% of the Company’s total revenue for the years ended December 31 as indicated are as follows: 2017 2016 Amount % of Total revenue Amount % of Total revenue Electrical construction operations Customer A $ 38,306 34 $ 23,669 18 Customer B — — 18,630 14 Customer C 16,912 15 33,770 26 Customer D 11,681 10 — — Revenue by service/product (in thousands of dollars) for the years ended December 31 as indicated are as follows: 2017 2016 Amount % of Total revenue Amount % of Total revenue Electrical construction operations Principal electrical construction operations (1) $ 100,305 88 $ 118,748 91 Other electrical construction (2) 8,850 8 7,023 5 Total 109,154 96 125,771 96 All other 4,799 4 4,652 4 Total revenue $ 113,954 100 $ 130,423 100 ___________ (1) Principal electrical construction operations includes revenue from transmission lines, distribution systems, substations and drilled pier foundations. (2) Other electrical construction includes revenue from storm work, fiber optics and other miscellaneous electrical construction items. The total of the above categories may differ from the sum of the components due to rounding.

Restricted Cash

Restricted Cash	12 Months Ended
	Dec. 31, 2017
Restricted Cash and Investments [Abstract]
Restricted Cash	Restricted Cash Restricted cash, reported under “Deferred charges and other assets” on the Company’s balance sheet, represents amounts deposited in a trust account to secure the Company’s obligations in connection with the Company’s workers’ compensation insurance policies.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets Associated with the Acquisition of C&C	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets Associated with the Acquisition of C&C	Goodwill and Other Intangible Assets Associated with the Acquisition of C&C The Company performed an annual impairment assessment on its goodwill and intangible assets on December 31, 2017 . Based upon this analysis, the Company determined that there were no impairments. The following table presents the gross and net balances of our goodwill and intangible assets as of the dates indicated: December 31, 2017 December 31, 2016 Useful Life Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Indefinite-lived and non-amortizable acquired intangible assets Goodwill Indefinite $ 101,407 $ — $ 101,407 $ 101,407 $ — $ 101,407 Definite-lived and amortizable acquired intangible assets Trademarks/Names 15 $ 640,000 $ (170,670 ) $ 469,330 $ 640,000 $ (128,002 ) $ 511,998 Customer relationships 20 350,000 (70,000 ) 280,000 350,000 (52,500 ) 297,500 Non-competition agreement 5 10,000 (8,664 ) 1,336 10,000 (7,332 ) 2,668 Other 1 13,800 (13,800 ) — 13,800 (13,800 ) — Total $ 1,013,800 $ (263,134 ) $ 750,666 $ 1,013,800 $ (201,634 ) $ 812,166 Amortization of definite-lived intangible assets will be approximately $60,000 annually for 2018 through 2022 .

Organization and Summary of S21

Organization and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Overview and Basis of Financial Statement Presentation	Overview The Goldfield Corporation (the “Company”) was incorporated in Wyoming in 1906 and subsequently reincorporated in Delaware in 1968. The Company’s principal line of business is the construction of electrical infrastructure for the utility industry and industrial customers. The principal market for the Company’s electrical construction operation is primarily in the Southeast and mid-Atlantic regions of the United States and Texas. Basis of Financial Statement Presentation The accompanying consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation. The Company adopted Accounting Standards Updates (“ASU”) ASU 2011-05 and ASU 2011-12, which require comprehensive income to be reported in either a single statement or in two consecutive statements reporting net income and other comprehensive income. The amendment eliminates the option to report other comprehensive income and its components in the statement of changes in stockholders’ equity. However, comprehensive income is equivalent to net income for the Company, and therefore, the Company’s accompanying financial statements do not include a Statement of Other Comprehensive Income.
Cash and Cash Equivalents	Cash and Cash Equivalents The Company considers highly liquid investments with maturities of three months or less when purchased to be cash equivalents.
Allowance for Doubtful Accounts	Allowance for Doubtful Accounts The allowance for doubtful accounts is the Company’s best estimate of the amount of probable credit losses in the Company’s existing accounts receivable. The Company determines the allowance based on customer specific information and historical write-off experience. The Company reviews its allowance for doubtful accounts quarterly. Account balances are charged off against the allowance after reasonable means of collection have been exhausted and the potential for recovery is considered remote. As of both December 31, 2017 and 2016 , upon its review, management determined it was not necessary to record an allowance for doubtful accounts due to the majority of accounts receivable being generated by electrical utility customers who the Company considers creditworthy based on timely collection history and other considerations.
Property, Buildings, Equipment and Depreciation	Property, Buildings, Equipment and Depreciation Property, buildings and equipment are stated at cost. Depreciation on property, buildings and equipment is calculated on the straight-line method over the estimated useful lives of the assets. Leasehold improvements are depreciated on a straight-line basis over the shorter of the lease term, including renewals that are deemed to be reasonably assured, or the estimated useful life of the improvement. In accordance with Accounting Standard Codification (“ASC”) ASC Topic 360-10-05, Accounting for the Impairment or Disposal of Long-Lived Assets , the Company assesses the need to record impairment losses on long-lived assets when events and circumstances indicate that the carrying amount of an asset may not be recoverable. An impairment loss would be recognized when future estimated undiscounted cash flows expected to result from use of the asset are less than the asset’s carrying value. Any resulting loss would be measured at fair value based on discounted expected cash flows.
Electrical Construction Revenue	Electrical Construction Revenue The Company accepts contracts on a fixed-price, unit-price and service agreement basis. Revenue from fixed-price construction contracts are recognized on the percentage-of-completion method, measured by the ratio of costs incurred to date, to the estimated total costs to be incurred for each contract. Revenue from unit-price contracts is recognized on either the percentage-of-completion method or a man-hour or man-hour plus equipment basis. Revenue from service agreements are recognized as services are performed. Revenue from service agreements are billed on either a man-hour or man-hour plus equipment basis. Terms of the Company’s service agreements may extend for periods beyond one year. The Company’s contracts allow it to bill additional amounts for change orders and claims. The Company considers a claim to be for additional work performed outside the scope of the contract and contested by the customer. Historically, claims relating to electrical construction work have not been significant. A change order is a modification to a contract that changes the provisions of the contract, typically resulting from changes in scope, specifications, design, manner of performance, facilities, equipment, materials, sites, or period of completion of the work under the contract. It is the Company’s policy to include revenue from change orders in contract value only when they can be reliably estimated and realization is considered probable, in accordance with ASC Topic 605-35-25-30 and ASC Topic 605-35-25-31, Revenue Recognition for Construction Type Contracts . The asset, “costs and estimated earnings in excess of billings on uncompleted contracts” represents revenue recognized in excess of amounts billed. The liability, “billings in excess of costs and estimated earnings on uncompleted contracts” represents billings in excess of revenue recognized. Contract costs include all direct material, direct labor, subcontractor costs and indirect costs related to contract performance, such as supplies, tools and equipment maintenance. General and administrative costs are charged to expense as incurred. Provisions for estimated losses on uncompleted contracts are made in the period in which such losses are determined. Changes in job performance, job conditions, estimated profitability and final contract settlements may result in revisions to costs and income and are recognized in the period in which the revisions are determined.
Land and Land Development Costs and Residential Properties Under Construction	Land and Land Development Costs and Residential Properties Under Construction The costs of a land purchase and any development expenses up to the initial construction phase of any residential property development project are recorded under the asset “land and land development costs.” Once construction commences, both the land development costs and construction costs are recorded under the asset “residential properties under construction.” The assets “land and land development costs” and “residential properties under construction” relating to specific projects are recorded as current assets when the estimated project completion date is less than one year from the date of the consolidated financial statements, or as non-current assets when the estimated project completion date is one year or more from the date of the consolidated financial statements. In accordance with ASC Topic 360-10, Accounting for the Impairment or Disposal of Long-lived Assets , land and residential properties under construction are reviewed by the Company for impairment whenever events or changes in circumstances indicate that the carrying value may not be recoverable. If the carrying amount or basis is not expected to be recovered, impairment losses are recorded and the related assets are adjusted to their estimated fair value. The fair value of an asset is the amount at which that asset could be bought or sold in a current transaction between willing parties, that is, other than in a forced or liquidation sale. The Company also complies with ASC Topic 820, Fair Value Measurement , which defines fair value, establishes a framework for measuring fair value, and expands disclosures about fair value measurements. The Company did not record an impairment write-down to either of its land carrying value or residential properties under construction carrying value for either the years ended December 31, 2017 or 2016 .
Income Taxes	Income Taxes The Company accounts for income taxes in accordance with ASC Topic 740, Income Taxes, which establishes the recognition requirements. Deferred tax assets and liabilities are recognized for the future tax effects attributable to temporary differences and carryforwards between the financial statement carrying amounts of existing assets and liabilities and the respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. The Company recognizes the effect of income tax positions only if those positions are more likely than not of being sustained. Recognized income tax positions are measured at the largest amount that is greater than 50% likely of being realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs. The Company records interest and penalties related to unrecognized tax benefits as interest expense and other general and administrative expenses, respectively, and not as a component of income taxes.
Executive Long-term Incentive Plan	Executive Long-term Incentive Plan The Company has not issued shares pursuant to The Goldfield Corporation 2013 Long-term Incentive Plan (the “2013 Plan”) in either 2017 or 2016 . Therefore, the Company has no compensation expense for shares pursuant to the 2013 Plan for either of the years ended December 31, 2017 or 2016 .
Use of Estimates	Use of Estimates Management of the Company has made a number of estimates and assumptions relating to the reporting of assets and liabilities and the disclosure of contingent assets and liabilities to prepare these consolidated financial statements in conformity with U.S. generally accepted accounting principles (“GAAP”). Actual results could differ from those estimates. Management considers the most significant estimates in preparing these consolidated financial statements to be the estimated cost to complete electrical construction contracts in progress, the adequacy of the accrued remediation costs and the realizability of deferred tax assets.
Fair Value of Financial Instruments	Fair Value of Financial Instruments The Company’s financial instruments include cash and cash equivalents, accounts receivable and accrued billings, restricted cash collateral deposited with insurance carriers, cash surrender value of life insurance policies, accounts payable, notes payable, and other current liabilities. Fair value is the price that would be received to sell an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The fair value guidance establishes a valuation hierarchy, which requires maximizing the use of observable inputs when measuring fair value. The three levels of inputs that may be used are: Level 1 - Quoted market prices in active markets for identical assets or liabilities. Level 2 - Observable market based inputs or other observable inputs. Level 3 - Significant unobservable inputs that cannot be corroborated by observable market data. These values are generally determined using valuation models incorporating management’s estimates of market participant assumptions. Fair values of financial instruments are estimated through the use of public market prices, quotes from financial institutions, and other available information. Management considers the carrying amounts reported on the consolidated balance sheets for cash and cash equivalents, accounts receivable and accrued billings, accounts payable and accrued liabilities, to approximate fair value due to the immediate or short-term maturity of these financial instruments. The Company’s carrying value of long-term notes payable are estimated by management to approximate fair value since the interest rates prescribed by Branch Banking and Trust Company (the “Bank”) are variable market interest rates and are adjusted periodically, and as such, are classified as Level 2. Restricted cash is considered by management to approximate fair value due to the nature of the asset held in a secured interest bearing bank account. The carrying value of cash surrender value of life insurance is also considered by management to approximate fair value as the carrying value is based on the current settlement value under the contract, as provided by the carrier and as such, is classified as Level 2.
Goodwill and Intangible Assets	Goodwill and Intangible Assets Intangible assets with finite useful lives recorded in connection with a historical acquisition are amortized over the term of the related contract or useful life, as applicable. Intangible assets held by the Company with finite useful lives include customer relationships and trademarks. The Company reviews the values recorded for intangible assets and goodwill to assess recoverability from future operations annually or whenever events or changes in circumstances indicate that their carrying amounts may not be recoverable. As of December 31, 2017 , the Company assessed the recoverability of its long-lived assets and goodwill, and believed that there were no events or circumstances present that would require a test of recoverability on those assets. As a result, there was no impairment of the carrying amounts of such assets.
Segment Reporting	Segment Reporting The Company operates as a single reportable segment, electrical construction, under ASC Topic 280-10-50 Disclosures about Segments of an Enterprise and Related Information . The Company’s real estate development operations are not significant for reporting purposes and, accordingly, results of the ongoing real estate development operations are included in the income statement under the caption “Other.” Certain corporate costs are not allocated to the electrical construction segment.
Reclassifications	Reclassifications Certain amounts previously reflected on the prior year cash flows from operating activities include amounts under contract loss accruals now included under Accounts payable and accrued liabilities. This reclassification had no effect on the previously reported total of cash flows from operating activities.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (the “FASB”) issued ASU 2014-09, which will replace most existing revenue recognition guidance in U.S. generally accepted accounting principles. The amendments under this pronouncement will change when and how an entity recognizes revenue from contracts it enters to transfer goods, services or non-financial assets to its customers. The new guidance creates a comprehensive framework for all entities in all industries to apply when determining when and how to recognize revenue. This new guidance supersedes virtually all existing revenue recognition requirements and guidance. This framework is expected to result in less complex guidance in application while providing a consistent and comparable methodology for revenue recognition. The core principle of ASU 2014-09 is that an entity should recognize revenue for the transfer of goods or services equal to the amount that it expects to be entitled to receive for those goods or services. ASU 2014-09 also requires additional disclosures about the nature, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments. ASU 2014-09 allows for either retrospective or cumulative effect transition methods of adoption and is effective for periods beginning after December 15, 2016. In August 2015, the FASB issued ASU 2015-14 which provides a one-year deferral of the revenue recognition standard’s effective date. Public business entities are required to apply the revenue recognition standard to annual reporting periods beginning after December 15, 2017, and interim periods within those annual periods. Under the new standard ASC Topic 606 Revenue from Contracts from Customers , electrical construction fixed-price contracts, currently accounted for under ASC Topic 605-35, will be recognized over time as services are performed and the underlying obligation to the customer is fulfilled. Generally, this will result in the use of input measures on a cost to cost basis, similar to the practices currently in place for contracts accounted for under ASC Topic 605-35. The Company has assessed that under the new guidance the primary impact will be on the timing of when and how contract modifications and change orders are recognized. Currently, contract modifications, change orders and variable consideration are generally included in total contract value when executed by the customer as compared to the new guidance, when legally enforceable and estimable. This may result in timing differences on the recognition of revenue and profit when compared to the Company’s current practices. Additionally, under ASC Topic 605-35 the Company’s contract modifications, change orders and variable consideration have historically been accounted for on a cumulative catch up basis. While this methodology is still applicable under the new standard, modifications, change orders and variable consideration need to be evaluated to determine whether distinct goods and services are being added to the contract or if they are distinct from the goods already transferred. The treatment of contract modifications, change orders and variable consideration on a contract by contract basis under the new standard could be different and have an impact on the timing of individual project revenue and profit. The Company has also determined there will not be material changes in the pattern of revenue recognition for electrical construction contracts, which are currently accounted for on a time and materials basis. These contracts will be treated as a series of distinct services transferred over time and will generally result in a similar revenue pattern when compared to our current accounting policies. The Company estimates that there will not be material changes in the pattern of revenue recognition for real estate development operations, which are presented under the caption “Other” in the consolidated financial statements. The Company will continue to recognize revenue upon the transfer of control of the promised real estate properties, generally at time of closing. When this pronouncement is adopted in 2018, the Company will adopt all amendments under this ASU using the cumulative effect transition method. The Company will apply this guidance to contracts with customers that were not substantially complete as of January 1, 2018 and will be effective for the quarter ending March 31, 2018. The Company’s financial results for reporting periods after January 1, 2018 will be presented under the new guidance, while financial results from prior periods will continue to be reported in accordance with the prior guidance and the Company's historical accounting policies. The Company has substantially completed its evaluation of the impact of the new guidance on its contracts with customers, including the identification of differences that may result from the new requirements, the most significant of which are discussed above. The Company does not expect this update to have a material effect on the Company’s results of operations, financial position or cash flows. This conclusion is based on the Company’s continued evaluation of on-going contracts, its understanding of historical contracts with its customers and its evaluation of contracts under the cumulative effect transition method. The Company expects its disclosures related to revenue recognition will expand to address new quantitative and qualitative requirements regarding the nature, amount and timing of revenue from contracts with customers and additional information related to contract assets and liabilities. The Company has identified and is in the final stages of implementing changes to its processes and internal controls to meet the reporting and disclosure requirements of this update. In May 2016, the FASB issued ASU 2016-12, which improves guidance on assessing collectability, presentation of sales taxes, non-cash consideration, and completed contracts and contract modifications at transition. The FASB has also issued the following standards which clarify ASU 2014-09 and have the same effective date as the original standard: ASU 2016-20, ASU 2016-10 and ASU 2016-08. These updates are effective concurrently with ASU 2014-09 and the Company does not expect the adoption of this new guidance to have a material impact on the Company’s consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, to increase transparency and comparability among organizations by recognizing all lease transactions (with terms in excess of 12 months) on the balance sheet as a lease liability and a right-of-use asset (as defined). ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, with earlier application permitted. Upon adoption, the lessee will apply the new standard retrospectively to all periods presented or retrospectively using a cumulative effect adjustment in the year of adoption. The Company expects this new guidance to cause a material increase to the assets and liabilities on the Company’s consolidated balance sheets. The Company is currently assessing the effect the adoption will have on its consolidated financial statements of income. The impact of this ASU is non-cash in nature, therefore the Company does not expect the adoption of this new guidance to have a material impact on the Company’s cash flows or liquidity. In August 2016, the FASB issued ASU 2016-15, which provides clarification regarding how certain cash receipts and cash payments are presented and classified in the statement of cash flows. This update addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice. In addition, in November 2016, the FASB issued ASU 2016-18, which requires that amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. Both updates are effective for annual and interim periods beginning after December 15, 2017, with early adoption permitted. The Company will adopt this guidance as of January 1, 2018 and does not expect the adoption will have a material impact on its consolidated financial statements. In October 2016, the FASB issued ASU 2016-16, which eliminates the requirement to defer the recognition of current and deferred income taxes for an intra-entity asset transfer until the asset has been sold to an outside party. Under the new guidance, an entity should recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. This update is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years; early adoption is permitted and is to be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings at the time of adoption. The Company will adopt this guidance as of January 1, 2018 and does not expect the adoption of this guidance to have a material impact on its consolidated financial statements. In January 2017, the FASB issued ASU 2017-04, which eliminates Step 2 of the current goodwill impairment test. A goodwill impairment loss will instead be measured at the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the recorded amount of goodwill allocated to that reporting unit. The provisions of this ASU are effective for years beginning after December 15, 2019, with early adoption permitted for any impairment test performed on testing dates after January 1, 2017. The Company is currently assessing the impact that adoption will have on its consolidated financial statements, however, the Company does not expect this ASU to have a significant impact on its consolidated financial statements or disclosures.

Costs and Estimated Earnings 22

Costs and Estimated Earnings on Uncompleted Contracts (Tables)	12 Months Ended
	Dec. 31, 2017
Contractors [Abstract]
Costs in Excess of Billings and Billings in Excess of Costs	Long-term fixed-price electrical construction contracts in progress accounted for using the percentage-of-completion method as of December 31 for the years as indicated: 2017 2016 Costs incurred on uncompleted contracts $ 48,681,608 $ 47,282,570 Estimated earnings 16,076,125 18,644,216 64,757,733 65,926,786 Less billings to date 58,849,655 59,458,744 Total $ 5,908,078 $ 6,468,042 Included in the consolidated balance sheets under the following captions Costs and estimated earnings in excess of billings on uncompleted contracts $ 6,074,346 $ 7,313,099 Billings in excess of costs and estimated earnings on uncompleted contracts (166,268 ) (845,057 ) Total $ 5,908,078 $ 6,468,042

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Schedule of income tax provision	The following table presents the income tax provision from continuing operations for the years ended December 31 as indicated: 2017 2016 Current Federal $ 3,863,151 $ 6,157,900 State 558,993 1,014,213 4,422,144 7,172,113 Deferred Federal (3,270,928 ) 570,770 State (115,219 ) 66,885 (3,386,147 ) 637,655 Total $ 1,035,997 $ 7,809,768 The following table presents the total income tax provision for the years ended December 31 as indicated: 2017 2016 Income tax provision $ 1,035,997 $ 7,809,768 Discontinued operations (164,235 ) (66,077 ) Total $ 871,762 $ 7,743,691
Schedule of deferred tax assets and liabilities	The following table presents the temporary differences and carryforwards, which give rise to deferred tax assets and liabilities as of December 31 as indicated: 2017 2016 Deferred tax assets Accrued vacation $ 113,893 $ 146,215 Acquisition costs capitalized 58,886 98,484 Accrued remediation costs 130,168 80,100 Accrued payables 174,674 122,235 Percentage completed contract method for tax 276,413 — Accrued workers’ compensation 159,237 127,033 Capitalized bidding costs 121,227 8,846 Inventory adjustments 139,565 133,991 Accrued lease expense 17,902 32,683 Accrued contract losses 50,220 89 Other 4,103 5,214 Total deferred tax assets 1,246,288 754,890 Deferred tax liabilities Tax amortization in excess of financial statement amortization (10,850 ) (12,156 ) Tax depreciation in excess of financial statement depreciation (5,934,158 ) (8,947,058 ) Total deferred tax liabilities (5,945,008 ) (8,959,214 ) Total net deferred tax liabilities $ (4,698,720 ) $ (8,204,324 )
Reconciliation of effective and statutory tax rates from continuing operations	The following table presents the differences between the Company’s effective income tax rate and the federal statutory rate on income from continuing operations for the years ended December 31 as indicated: 2017 2016 Federal statutory rate 34.0% 35.0% State tax rate, net of federal tax 3.1 3.3 Nondeductible expenses 3.6 1.6 Domestic production activities deduction (4.0) (3.2) Tax Act rate change (26.0) — Other 0.1 0.6 Total 10.8% 37.3%
Reconciliation of beginning and ending unrecognized tax benefits	The following table presents a reconciliation of the beginning and ending amounts of unrecognized tax benefits for the years as indicated: 2017 2016 Balance as of January 1 $ 4,723 $ 4,723 Increase from current year tax positions — — Decrease from settlements with taxing authority — — Balance as of December 31 $ 4,723 $ 4,723

Property, Buildings and Equip24

Property, Buildings and Equipment (Tables)	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Property, Buildings and Equipment	The following table presents the balances of major classes of properties as of December 31 as indicated: Estimated useful lives in years 2017 2016 Land — $ 530,221 $ 371,228 Land improvements 7 - 15 495,484 470,754 Buildings and improvements 5 - 40 2,588,053 2,155,578 Leasehold improvements 7 - 39 252,646 252,646 Machinery and equipment 2 - 10 70,892,181 62,955,883 Construction in progress — 241,369 180,072 Total 74,999,954 66,386,161 Less accumulated depreciation 38,927,654 33,140,214 Net properties, buildings and equipment $ 36,072,300 $ 33,245,947

Notes Payable (Tables)

Notes Payable (Tables)	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Schedule of long-term debt	The following table presents the balances of our notes payables as of December 31 as indicated: Branch Banking and Trust Company Maturity Date 2017 2016 Interest Rates 2017 2016 Working Capital Loan November 28, 2019 $ 2,750,000 $ 3,950,000 3.38 % 2.44 % $22.6 Million Equipment Loan March 9, 2021 $ 19,540,000 $ — 3.25 % — % $10.0 Million Equipment Loan July 28, 2020 — 7,579,630 — % 2.81 % $17.0 Million Equipment Loan March 6, 2020 — 9,601,000 — % 2.50 % $2.0 Million Equipment Loan March 6, 2020 — 1,256,625 — % 2.50 % Total notes payable 22,290,000 22,387,255 Less unamortized debt issuance costs 38,646 54,027 Total notes payable, net 22,251,354 22,333,228 Less current portion of notes payable, net 6,099,787 6,101,855 Notes payable net, less current portion $ 16,151,567 $ 16,231,373
Schedule of payments of notes payable	The schedule of payments of the notes payable as of December 31, 2017 is as follows: 2018 $ 6,120,000 2019 8,870,000 2020 6,120,000 2021 1,180,000 Total payments of debt $ 22,290,000

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Future minimum lease payments under operating leases	Future minimum lease payments under operating leases having initial or remaining non-cancelable lease terms in excess of one year as of December 31, 2017 are as follows: 2018 $ 4,636,362 2019 3,570,048 2020 837,971 2021 and beyond 7,999 Total minimum operating lease payments $ 9,052,380
Schedule of multi-employer pension plans	Certified Zone Status Plan Name: EIN Number Plan Number 2017 2016 FIP Implemented Surcharge Imposed Expiration Date of Collective Bargaining Agreement National Electrical Benefit Fund 53-0181657 001 Green Green Not applicable (green-zone plan) Not applicable (green-zone plan) August 31, 2019
Summary of committed expenditures	The following table presents the Company’s committed expenditures as of December 31, 2017 : 2018 $ 2,871,492 2019 369,069 2020 128,244 2021 and beyond 64,122 Total committed expenditures $ 3,432,927

Business Concentration and Cr27

Business Concentration and Credit Risks (Tables)	12 Months Ended
	Dec. 31, 2017
Major customers [Member]
Concentration Risk [Line Items]
Schedule of concentration risk	Revenue (in thousands of dollars) to customers exceeding 10% of the Company’s total revenue for the years ended December 31 as indicated are as follows: 2017 2016 Amount % of Total revenue Amount % of Total revenue Electrical construction operations Customer A $ 38,306 34 $ 23,669 18 Customer B — — 18,630 14 Customer C 16,912 15 33,770 26 Customer D 11,681 10 — —
Service/product [Member]
Concentration Risk [Line Items]
Schedule of concentration risk	Revenue by service/product (in thousands of dollars) for the years ended December 31 as indicated are as follows: 2017 2016 Amount % of Total revenue Amount % of Total revenue Electrical construction operations Principal electrical construction operations (1) $ 100,305 88 $ 118,748 91 Other electrical construction (2) 8,850 8 7,023 5 Total 109,154 96 125,771 96 All other 4,799 4 4,652 4 Total revenue $ 113,954 100 $ 130,423 100 ___________ (1) Principal electrical construction operations includes revenue from transmission lines, distribution systems, substations and drilled pier foundations. (2) Other electrical construction includes revenue from storm work, fiber optics and other miscellaneous electrical construction items.

Goodwill and Other Intangible28

Goodwill and Other Intangible Assets Associated with the Acquisition of C&C (Tables)	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Finite-Lived Intangible Assets	The following table presents the gross and net balances of our goodwill and intangible assets as of the dates indicated: December 31, 2017 December 31, 2016 Useful Life Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Indefinite-lived and non-amortizable acquired intangible assets Goodwill Indefinite $ 101,407 $ — $ 101,407 $ 101,407 $ — $ 101,407 Definite-lived and amortizable acquired intangible assets Trademarks/Names 15 $ 640,000 $ (170,670 ) $ 469,330 $ 640,000 $ (128,002 ) $ 511,998 Customer relationships 20 350,000 (70,000 ) 280,000 350,000 (52,500 ) 297,500 Non-competition agreement 5 10,000 (8,664 ) 1,336 10,000 (7,332 ) 2,668 Other 1 13,800 (13,800 ) — 13,800 (13,800 ) — Total $ 1,013,800 $ (263,134 ) $ 750,666 $ 1,013,800 $ (201,634 ) $ 812,166

Organization and Summary of S29

Organization and Summary of Significant Accounting Policies (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Maximum service period term (in years)	1 year
Long-term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 0	$ 0

Costs and Estimated Earnings 30

Costs and Estimated Earnings on Uncompleted Contracts (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Contractors [Abstract]
Costs incurred on uncompleted contracts	$ 48,681,608	$ 47,282,570
Estimated earnings	16,076,125	18,644,216
Total estimated contract revenue	64,757,733	65,926,786
Less billings to date	58,849,655	59,458,744
Total	5,908,078	6,468,042
Costs and estimated earnings in excess of billings on uncompleted contracts	6,074,346	7,313,099
Billings in excess of costs and estimated earnings on uncompleted contracts	(166,268)	(845,057)
Contract receivable	$ 3,300,000	$ 3,200,000

Income Taxes (Details)

Income Taxes (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Current
Federal	$ 3,863,151	$ 6,157,900
State	558,993	1,014,213
Current Total	4,422,144	7,172,113
Deferred
Federal	(3,270,928)	570,770
State	(115,219)	66,885
Deferred Total	(3,386,147)	637,655
Total	1,035,997	7,809,768
Income tax provision	1,035,997	7,809,768
Discontinued operations	(164,235)	(66,077)
Total	871,762	7,743,691
Deferred tax assets
Accrued vacation	113,893	146,215
Acquisition costs capitalized	58,886	98,484
Accrued remediation costs	130,168	80,100
Accrued payables	174,674	122,235
Percentage completed contract method for tax	276,413	0
Accrued workers’ compensation	159,237	127,033
Capitalized bidding costs	121,227	8,846
Inventory adjustments	139,565	133,991
Accrued lease expense	17,902	32,683
Accrued contract losses	50,220	89
Other	4,103	5,214
Total deferred tax assets	1,246,288	754,890
Deferred tax liabilities
Tax amortization in excess of financial statement amortization	(10,850)	(12,156)
Tax depreciation in excess of financial statement depreciation	(5,934,158)	(8,947,058)
Total deferred tax liabilities	(5,945,008)	(8,959,214)
Total net deferred tax liabilities	(4,698,720)	(8,204,324)
Non-current deferred tax liability	4,698,720	$ 8,204,324
One-time income tax benefit	2,500,000
Capital expenditures qualifying for immediate expensing	140,000
Minimum amount of future taxable income required to realize deferred tax assets	$ 5,000,000
Schedule of differences between effective income tax rate and federal statutory rate
Federal statutory rate	34.00%	35.00%
State tax rate, net of federal tax	3.10%	3.30%
Nondeductible expenses	3.60%	1.60%
Domestic production activities deduction	(4.00%)	(3.20%)
Tax Act rate change	(26.00%)	0.00%
Other	0.10%	0.60%
Total	10.80%	37.30%
Reconciliation of beginning and ending unrecognized tax benefits
Balance as of January 1	$ 4,723	$ 4,723
Increase from current year tax positions	0	0
Decrease from settlements with taxing authority	0	0
Balance as of December 31	5,000	4,723
Income tax interest and penalties expensed during period	1,000	1,000
Accrued income tax interest and penalties	$ 9,000	$ 8,000

Discontinued Operations (Detail

Discontinued Operations (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Discontinued Operations and Disposal Groups [Abstract]
Contingency provision related to discontinued operations	$ 522,000	$ 215,000
Provision for remediation costs	(440,000)	(174,000)
Loss from discontinued operations, net of tax	(275,624)	(108,007)
Income tax benefit, discontinued operations	$ (164,235)	$ (66,077)

Property, Buildings and Equip33

Property, Buildings and Equipment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property, building and equipment, gross	$ 74,999,954	$ 66,386,161
Less accumulated depreciation	38,927,654	33,140,214
Net properties, buildings and equipment	36,072,300	33,245,947
Land [Member]
Property, Plant and Equipment [Line Items]
Property, building and equipment, gross	530,221	371,228
Land improvements [Member}
Property, Plant and Equipment [Line Items]
Property, building and equipment, gross	$ 495,484	470,754
Land improvements [Member} | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives in years	7 years
Land improvements [Member} | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives in years	15 years
Buildings and improvements [Member}
Property, Plant and Equipment [Line Items]
Property, building and equipment, gross	$ 2,588,053	2,155,578
Buildings and improvements [Member} | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives in years	5 years
Buildings and improvements [Member} | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives in years	40 years
Leasehold improvements [Member}
Property, Plant and Equipment [Line Items]
Property, building and equipment, gross	$ 252,646	252,646
Leasehold improvements [Member} | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives in years	7 years
Leasehold improvements [Member} | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives in years	39 years
Machinery and equipment [Member}
Property, Plant and Equipment [Line Items]
Property, building and equipment, gross	$ 70,892,181	62,955,883
Machinery and equipment [Member} | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives in years	2 years
Machinery and equipment [Member} | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives in years	10 years
Construction in progress [Member}
Property, Plant and Equipment [Line Items]
Property, building and equipment, gross	$ 241,369	$ 180,072

401 (k) Employee Benefits Plan

401 (k) Employee Benefits Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Retirement Benefits [Abstract]
Maximum annual contribution percentage per employee	75.00%
Employer discretionary contributions to the plan	$ 297	$ 286

Notes Payable (Details)

Notes Payable (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Balances of the Company's notes payable
Note payable balance	$ 22,290,000	$ 22,387,255
Less unamortized debt issuance costs	38,646	54,027
Total notes payable, net	22,251,354	22,333,228
Less current portion of notes payable, net	6,099,787	6,101,855
Notes payable net, less current portion	$ 16,151,567	16,231,373
Working Capital Loan [Member]
Balances of the Company's notes payable
Maturity Date	Nov. 28, 2019
Note payable balance	$ 2,750,000	$ 3,950,000
Interest Rate	3.38%	2.44%
$22.6 Million Equipment Loan [Member]
Balances of the Company's notes payable
Loan agreement face amount	$ 22,600,000
Maturity Date	Mar. 9, 2021
Note payable balance	$ 19,540,000	$ 0
Interest Rate	3.25%	0.00%
$10.0 Million Equipment Loan [Member]
Balances of the Company's notes payable
Loan agreement face amount	$ 10,000,000
Maturity Date	Jul. 28, 2020
Note payable balance	$ 0	$ 7,579,630
Interest Rate	0.00%	2.81%
$17.0 Million Equipment Loan [Member]
Balances of the Company's notes payable
Loan agreement face amount	$ 17,000,000
Maturity Date	Mar. 6, 2020
Note payable balance	$ 0	$ 9,601,000
Interest Rate	0.00%	2.50%
$2.0 Million Equipment Loan [Member]
Balances of the Company's notes payable
Loan agreement face amount	$ 2,000,000
Maturity Date	Mar. 6, 2020
Note payable balance	$ 0	$ 1,256,625
Interest Rate	0.00%	2.50%

Notes Payable - Textual (Detail

Notes Payable - Textual (Details) - USD ($)	Jun. 09, 2017	Dec. 31, 2017	Dec. 31, 2016
Notes Payable (Textual) [Abstract]
Repayments on notes payable		$ 22,697,255	$ 8,840,137
Borrowings outstanding		22,290,000	22,387,255
Letter of credit related to workers' compensation		420,000
Working Capital Loan [Member]
Notes Payable (Textual) [Abstract]
Revolving line of credit loan		18,000,000
Borrowings outstanding		$ 2,750,000	$ 3,950,000
Bank Loans [Member]
Notes Payable (Textual) [Abstract]
Repayments on notes payable	$ 15,600,000
2015 Master Loan Agreement [Member]
Notes Payable (Textual) [Abstract]
Interest payable maximum rate		24.00%
London Interbank Offered Rate (LIBOR) [Member] | 2015 Master Loan Agreement [Member]
Notes Payable (Textual) [Abstract]
Basis spread added to monthly LIBOR		1.80%

Notes Payable - Schedule of Rep

Notes Payable - Schedule of Repayments of Notes Payable (Details)	Dec. 31, 2017USD ($)
Debt Disclosure [Abstract]
2,018	$ 6,120,000
2,019	8,870,000
2,020	6,120,000
2,021	1,180,000
Total payments of debt	$ 22,290,000

Commitments and Contingencies38

Commitments and Contingencies (Details)	12 Months Ended
	Dec. 31, 2017USD ($)employer	Dec. 31, 2016USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2,018	$ 4,636,362
2,019	3,570,048
2,020	837,971
2,021	7,999
Total minimum operating lease payments	9,052,380
Total rent expense	4,700,000	$ 4,800,000
Contributions to plan	$ 180,000	$ 176,000
Arrangement Expiring August 31, 2017 [Member] | Multiemployer Plan, Plan Information, Available [Member] | National Electrical Benefit Fund [Member] | Multiemployer Plans, Pension [Member]
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Number of employers responsible for 5% or more of contributions to multiemployer pension plan | employer	0
Percent of employer contribution for multiemployer pension plan (no more than 5%)	5.00%
Office space [Member]
Operating Leased Assets [Line Items]
Non-cancelable operating lease period	9 years
Office equipment [Member]
Operating Leased Assets [Line Items]
Non-cancelable operating lease period	4 years
Electrical construction equipment [Member]
Operating Leased Assets [Line Items]
Non-cancelable operating lease period	60 months

Commitments and Contingencies -

Commitments and Contingencies - Performance Bonds (Details) $ in Millions	Dec. 31, 2017USD ($)
Performance Bond [Member]
Guarantor Obligations [Line Items]
Outstanding performance bonds	$ 58.2

Commitments and Contingencies40

Commitments and Contingencies - Schedule of Multi-employer Pension Plans (Details) - Multiemployer Plan, Plan Information, Available [Member] - National Electrical Benefit Fund [Member] - Multiemployer Plans, Pension [Member] - Arrangement Expiring August 31, 2017 [Member]	12 Months Ended
	Dec. 31, 2017
Multiemployer Plans [Line Items]
EIN Number	530,181,657
Plan Number	1

Commitments and Contingencies41

Commitments and Contingencies - Summary of Committed Expenditures (Details)	Dec. 31, 2017USD ($)
Commitments and Contingencies Disclosure [Abstract]
2,018	$ 2,871,492
2,019	369,069
2,020	128,244
2021 and beyond	64,122
Total committed expenditures	$ 3,432,927

Income Per Share of Common St42

Income Per Share of Common Stock (Details) - shares	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Shares of treasury stock excluded from weighted average number of common stock shares outstanding	2,362,418	2,362,418

Common Stock Repurchase Plan (D

Common Stock Repurchase Plan (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Sep. 21, 2017	Dec. 31, 2016	Sep. 16, 2002
Equity, Class of Treasury Stock [Line Items]
Total number of shares repurchased	2,362,418		2,362,418
Total cost of shares repurchased	$ 1,308,187		$ 1,308,187
2002 Common Stock Repurchase Plan [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchase plan, number of shares permitted		3,500,000
Remaining number of shares available to be repurchased		1,154,940
Total number of shares repurchased	2,345,060
Total cost of shares repurchased	$ 1,289,467
Average cost per share repurchased (usd per share)	$ 0.55
Stock Repurchase Programs Prior to 2002 [Member]
Equity, Class of Treasury Stock [Line Items]
Total number of shares repurchased				17,358
Total cost of shares repurchased				$ 18,720

Business Concentration and Cr44

Business Concentration and Credit Risks (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Concentration Risk [Line Items]
Accounts receivable and accrued billings, net	$ 21,566,842	$ 19,094,407
Revenues	113,953,519	130,423,463
Revenue [Member] | Major customers [Member] | Customer A [Member]
Concentration Risk [Line Items]
Revenues	$ 38,306,000	$ 23,669,000
Concentration risk, percentage	34.00%	18.00%
Revenue [Member] | Major customers [Member] | Customer B [Member]
Concentration Risk [Line Items]
Revenues	$ 0	$ 18,630,000
Concentration risk, percentage	0.00%	14.00%
Revenue [Member] | Major customers [Member] | Customer C [Member]
Concentration Risk [Line Items]
Revenues	$ 16,912,000	$ 33,770,000
Concentration risk, percentage	15.00%	26.00%
Revenue [Member] | Major customers [Member] | Customer D [Member]
Concentration Risk [Line Items]
Revenues	$ 11,681,000	$ 0
Concentration risk, percentage	10.00%	0.00%
Revenue [Member] | Service/product [Member]
Concentration Risk [Line Items]
Revenues	$ 113,954,000	$ 130,423,000
Concentration risk, percentage	100.00%	100.00%
Revenue [Member] | Service/product [Member] | Electrical Construction [Member]
Concentration Risk [Line Items]
Revenues	$ 109,154,000	$ 125,771,000
Concentration risk, percentage	96.00%	96.00%
Revenue [Member] | Service/product [Member] | Principal electrical construction operations [Member]
Concentration Risk [Line Items]
Revenues	$ 100,305,000	$ 118,748,000
Concentration risk, percentage	88.00%	91.00%
Revenue [Member] | Service/product [Member] | Other electrical construction [Member]
Concentration Risk [Line Items]
Revenues	$ 8,850,000	$ 7,023,000
Concentration risk, percentage	8.00%	5.00%
Revenue [Member] | Service/product [Member] | All other [Member]
Concentration Risk [Line Items]
Revenues	$ 4,799,000	$ 4,652,000
Concentration risk, percentage	4.00%	4.00%

Goodwill and Other Intangible45

Goodwill and Other Intangible Assets Associated with the Acquisition of C&C (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 101,407	$ 101,407
Gross Carrying Amount	1,013,800	1,013,800
Accumulated Amortization	(263,134)	(201,634)
Net Carrying Amount	750,666	812,166
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Amortization expense, 2018	60,000
Amortization expense, 2019	60,000
Amortization expense, 2020	60,000
Amortization expense, 2021	60,000
Amortization expense, 2022	$ 60,000
Trademarks/Names [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	15 years
Gross Carrying Amount	$ 640,000	640,000
Accumulated Amortization	(170,670)	(128,002)
Net Carrying Amount	$ 469,330	511,998
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	20 years
Gross Carrying Amount	$ 350,000	350,000
Accumulated Amortization	(70,000)	(52,500)
Net Carrying Amount	$ 280,000	297,500
Non-compete agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	5 years
Gross Carrying Amount	$ 10,000	10,000
Accumulated Amortization	(8,664)	(7,332)
Net Carrying Amount	$ 1,336	2,668
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	1 year
Gross Carrying Amount	$ 13,800	13,800
Accumulated Amortization	(13,800)	(13,800)
Net Carrying Amount	$ 0	$ 0