Limbach (LMB) 10-Q 15 May 18 2018 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2018	May 14, 2018
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
Entity Registrant Name	Limbach Holdings, Inc.
Entity Central Index Key	1,606,163
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company
Trading Symbol	LMB
Entity Common Stock, Shares Outstanding		7,542,249

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 375	$ 626
Restricted cash	113	113
Accounts receivable, net	126,843	129,343
Costs and estimated earnings in excess of billings on uncompleted contracts	29,969	33,006
Other current assets	4,300	3,172
Total current assets	161,600	166,260
Property and equipment, net of accumulated depreciation of $8.8 million and $7.8 million at March 31, 2018 and December 31, 2017, respectively	18,320	17,918
Intangible assets, net	13,890	14,225
Goodwill	10,488	10,488
Deferred tax asset	4,707	3,664
Other assets	493	465
Total assets	209,498	213,020
Current liabilities
Current portion of long-term debt	7,301	6,358
Accounts payable, including retainage	62,077	67,438
Billings in excess of costs and estimated earnings on uncompleted contracts	31,181	28,543
Accrued income taxes	2,088	2,220
Accrued expenses and other current liabilities	26,528	30,925
Total current liabilities	129,175	135,484
Long-term debt	35,188	20,556
Other long-term liabilities	1,038	861
Total liabilities	165,401	156,901
Commitments and contingencies (Note 14)
Redeemable convertible preferred stock, net, par value $0.0001, 1,000,000 shares authorized, no shares issued and outstanding at March 31, 2018 and 280,000 issued and outstanding at December 31, 2017, respectively ($7,853 redemption value at December 31, 2017)	0	7,959
STOCKHOLDERS’ EQUITY
Common stock, $.0001 par value; 100,000,000 shares authorized, 7,542,249 issued and outstanding at March 31, 2018 and 7,504,133 at December 31, 2017	1	1
Additional paid-in capital	53,099	54,738
Accumulated deficit	(9,003)	(6,579)
Total stockholders’ equity	44,097	48,160
Total liabilities and stockholders’ equity	$ 209,498	$ 213,020

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ 8,800	$ 7,800
Common Stock, Par or Stated Value Per Share	$ 0.0001	$ 0.0001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares, issued	7,542,249	7,504,133
Common stock, shares, outstanding	7,542,249	7,504,133
Redeemable Preferred Stock [Member]
Temporary Equity, Par or Stated Value Per Share	$ 0.0001	$ 0.0001
Temporary Equity, Shares Authorized	1,000,000	1,000,000
Temporary Equity, Shares Issued	0	280,000
Temporary Equity, Shares Outstanding	0	280,000
Temporary Equity, Aggregate Amount of Redemption Requirement		$ 7,853

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue	$ 120,549	$ 115,190
Cost of revenue	107,262	101,421
Gross profit	13,287	13,769
Operating expenses:
Selling, general and administrative expense	15,666	14,567
Amortization of intangibles	335	1,008
Total operating expenses	16,001	15,575
Operating loss	(2,714)	(1,806)
Other income (expenses):
Interest expense, net	(769)	(454)
Gain (loss) on disposition of property and equipment	16	(37)
Total other expenses	(753)	(491)
Loss before income taxes	(3,467)	(2,297)
Income tax benefit	(1,043)	(1,083)
Net loss	(2,424)	(1,214)
Dividends on cumulative redeemable convertible preferred stock	(113)	238
Premium paid on redemption of redeemable convertible preferred stock	2,219	0
Net loss attributable to Limbach Holdings, Inc. common stockholders	$ (4,530)	$ (1,452)
Basic loss per share for common stock:
Net loss attributable to Limbach Holdings, Inc. common stockholders	$ (0.60)	$ (0.19)
Diluted loss per share for common stock:
Net loss attributable to Limbach Holdings, Inc. common stockholders	$ (0.60)	$ (0.19)
Weighted average number of shares outstanding:
Basic	7,541,422	7,454,491
Diluted	7,541,422	7,454,491

Condensed Consolidated Stateme5

Condensed Consolidated Statement of Stockholders’ Equity - 3 months ended Mar. 31, 2018 - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated (Deficit) [Member]
Beginning Balance at Dec. 31, 2017	$ 48,160	$ 1	$ 54,738	$ (6,579)
Beginning Balance (in shares) at Dec. 31, 2017		7,504,133
Dividends on redeemable convertible preferred stock	113		113
Premium paid on redemption of redeemable convertible preferred stock	(2,219)		(2,219)
Stock-based compensation	467		467
Stock-based compensation (in shares)		27,489
Exercise of warrants	0	$ 0	0
Exercise of warrants (in shares)		10,627
Net loss	(2,424)			(2,424)
Ending Balance at Mar. 31, 2018	$ 44,097	$ 1	$ 53,099	$ (9,003)
Ending Balance (in shares) at Mar. 31, 2018		7,542,249

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net loss	$ (2,424)	$ (1,214)
Adjustments to reconcile net loss to cash provided by operating activities:
Depreciation and amortization	1,371	2,646
Allowance for doubtful accounts	20	266
Stock-based compensation expense	467	0
Amortization of debt issuance costs	68	45
Deferred income tax benefit	(1,043)	(1,083)
Accretion of preferred stock discount to redemption value	0	2
(Gain) loss on sale of property and equipment	(16)	37
Changes in operating assets and liabilities:
(Increase) decrease in accounts receivable	2,481	6,231
(Increase) decrease in costs and estimated earnings in excess of billings on uncompleted contracts	3,037	2,237
(Increase) decrease in other current assets	(1,129)	(573)
(Increase) decrease in other assets	(210)	0
Increase (decrease) in accounts payable	(5,362)	(3,197)
Increase (decrease) in billings in excess of costs and estimated earnings on uncompleted contracts	2,639	(5,075)
Increase (decrease) in accrued taxes	(134)	0
Increase (decrease) in accrued expenses and other current liabilities	(16)	(4,955)
Increase (decrease) in other long-term liabilities	177	(94)
Net cash used in operating activities	(74)	(4,727)
Cash flows from investing activities:
Proceeds from sale of property and equipment	71	7
Decrease (increase) in advances to joint ventures	1	0
Purchase of property and equipment	(775)	(630)
Net cash used in investing activities	(703)	(623)
Cash flows from financing activities:
Increase (decrease) in bank overdrafts	(4,299)	0
Payments on Credit Agreement term loan	(750)	(750)
Proceeds from Credit Agreement revolver	41,296	13,034
Payments on Credit Agreement revolver	(34,849)	(7,034)
Payments on term loan	0	(20)
Proceeds from Bridge Term Loan	10,000	0
Payments on Bridge Term Loan	(250)	0
Payments on financed insurance premium	0	(591)
Payments on capital leases	(475)	(404)
Convertible preferred stock redeemed	(9,191)	0
Convertible preferred stock dividends paid	(875)	0
Taxes paid related to net-share settlement of equity awards	(81)	0
Net cash provided by financing activities	526	4,235
Decrease in cash and cash equivalents	(251)	(1,115)
Cash and cash equivalents, beginning of period	626	7,406
Cash and cash equivalents, end of period	375	6,291
Noncash investing and financing transactions:
Property and equipment acquired financed with capital leases	718	393
Interest paid	729	409
Financed insurance premium	$ 0	$ 2,135

Organization and Plan of Busine

Organization and Plan of Business Operations	3 Months Ended
	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	Limbach Holdings, Inc. (the “Company”) is a Delaware corporation headquartered in Pittsburgh, Pennsylvania. The Company’s Condensed Consolidated Financial Statements include the accounts of Limbach Holdings, Inc. and its wholly owned subsidiaries, including Limbach Holdings LLC (“LHLLC”), Limbach Facility Services LLC, Limbach Company LLC, Limbach Company LP, Harper Limbach LLC and Harper Limbach Construction LLC. We operate our business in two segments, (i) Construction, in which we generally manage large construction or renovation projects that involve primarily HVAC, plumbing or electrical services, and (ii) Service, in which we provide maintenance or service primarily on HVAC, plumbing or electrical systems. This work is primarily performed under fixed price, modified fixed price, and time and material contracts over periods of typically less than two years. The Company's customers operate in several different industries, including healthcare, education, government, commercial, manufacturing, mission critical, entertainment, and leisure. The Company operates primarily in the Northeast, Mid-Atlantic, Southeast, Midwest, and Southwestern regions of the United States. The Company was originally incorporated as a special purpose acquisition company, formed for the purpose of effecting a merger, equity interest exchange, asset acquisition, stock purchase, reorganization or similar business combination with one or more businesses. On July 20, 2016, the Company consummated a business combination (“Business Combination”) whereby it acquired all of the outstanding equity of LHLLC. In connection with the closing of the Business Combination, the Company changed its name from 1347 Capital Corp. (“1347 Capital”) to Limbach Holdings, Inc. Emerging Growth Company Section 102(b)(1) of the JOBS Act exempts emerging growth companies from being required to comply with new or revised financial accounting standards until private companies (that is, those that have not had a Securities Act registration statement declared effective or do not have a class of securities registered under the Exchange Act) are required to comply with the new or revised financial accounting standards. The JOBS Act provides that a company can elect to opt out of the extended transition period and comply with the requirements that apply to non-emerging growth companies but any such election to opt out is irrevocable. The Company has elected not to opt out of such extended transition period which means that when a standard is issued or revised and it has different application dates for public or private companies, the Company, as an emerging growth company, can adopt the new or revised standard at the time private companies adopt the new or revised standard. This may make comparison of the Company’s financial statements with another public company which is neither an emerging growth company nor an emerging growth company which has opted out of using the extended transition period difficult or impossible because of the potential differences in accounting standards used.

Significant Accounting Policies

Significant Accounting Policies	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Significant Accounting Policies [Text Block]	Note 2 – Significant Accounting Policies Condensed Financial Statements The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with instructions to the Quarterly Report on Form 10-Q and Rule 8-03 of Regulation S-X for smaller reporting companies. Consequently, certain information and note disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”) have been condensed or omitted pursuant to those rules and regulations, although the Company believes that the disclosures made are adequate to make the information not misleading. Readers of this report should refer to the consolidated financial statements and the notes thereto included in our latest Annual Report on Form 10-K filed with the Securities and Exchange Commission (“SEC”) on April 2, 2018. The accompanying interim Condensed Consolidated Balance Sheets, Condensed Consolidated Statements of Operations, Condensed Consolidated Statement of Stockholders’ Equity and the Condensed Consolidated Statements of Cash Flows for the periods presented are unaudited. Also, within the notes to the Condensed Consolidated Financial Statements, we have included unaudited information for these interim periods. These unaudited interim Condensed Consolidated Financial Statements have been prepared in accordance with GAAP. In our opinion, the accompanying unaudited condensed consolidated financial statements contain all adjustments (consisting only of a normal recurring nature) necessary for a fair statement of the Company’s financial position as of March 31, 2018, and its results of operations and its cash flows for the periods presented. The results for the three months ended March 31, 2018 are not necessarily indicative of the results to be expected for the year ending December 31, 2018. The Condensed Consolidated Balance Sheet as of December 31, 2017 was derived from our audited financial statements filed with the SEC on April 2, 2018, but is presented as condensed and does not contain all of the footnote disclosures from the annual financial statements. Revenues from construction fixed price and modified fixed price contracts are recognized on the percentage-of-completion method, measured by the relationship of total cost incurred to total estimated contract costs (cost-to-cost method). Contract revenue for long-term construction contracts is based upon management's estimate of contract values at completion, including revenue for additional work on which the contract value has not been finalized (claims and unapproved change orders) but is considered probable. Changes in job performance, job conditions, and estimated profitability, including those arising from contract penalty provisions and final contract settlements, may result in revisions to estimated costs and income, and are recognized in the period in which the revisions are determined. There are two basic types of service contracts: fixed price service contracts which are signed in advance for maintenance, repair, and retrofit work over a period of typically one year, and service contracts not signed in advance for similar maintenance, repair, and retrofit work performed on an as-needed basis. Fixed price service contracts are generally performed evenly over the contract period, and accordingly, revenue is recognized on a pro rata basis over the life of the contract. Revenues derived from other service contracts are recognized when the services are performed. Expenses related to all service contracts are recognized as services are provided. Costs and estimated earnings in excess of billings on uncompleted contracts reflected in the Condensed Consolidated Financial Statements arise when revenues have been recognized but the amounts cannot be billed under the terms of the contracts. Also included in costs and estimated earnings on uncompleted contracts are amounts the Company seeks or will seek to collect from customers or others for errors or changes in contract specifications or design, contract change orders in dispute or unapproved as to scope and price, or other customer-related causes of unanticipated additional contract costs (claims and unapproved change orders). Such amounts are recorded at estimated net realizable value when realization is probable and can be reasonably estimated. No profit is recognized on the construction costs incurred in connection with claim amounts. Claims and unapproved change orders made by the Company may involve negotiation and, in rare cases, litigation. Claims and unapproved change orders involve the use of estimates, and it is reasonably possible that revisions to the estimated recoverable amounts of recorded claims and unapproved change orders may be made in the near term. Claims against the Company are recognized when a loss is considered probable and amounts are reasonably determinable. Billings in excess of costs and estimated earnings on uncompleted contracts represent billings in excess of revenues recognized. In accordance with industry practice, we classify as current all assets and liabilities relating to the performance of contracts. The terms of our contracts generally range from six months to two years. Selling, general, and administrative costs are charged to expense as incurred. Bidding and proposal costs are also recognized as an expense in the period in which such amounts are incurred.

Accounting Standards

Accounting Standards	3 Months Ended
	Mar. 31, 2018
Accounting Changes and Error Corrections [Abstract]
New Accounting Pronouncements and Changes in Accounting Principles [Text Block]	Note 3 – Accounting Standards Recent Accounting Pronouncements The effective dates shown in the following pronouncements are private company effective dates, based upon the Company’s election to conform to private company effective dates based on the relief provided to Emerging Growth Companies (“EGC”) under the JOBS Act. In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, “Revenue from Contracts with Customers—Topic 606,” which supersedes the revenue recognition requirements in FASB Accounting Standard Codification (“ASC”) 605. The new guidance established principles for reporting revenue and cash flows arising from an entity’s contracts with customers. This new revenue recognition standard will replace all of the recognition guidance within GAAP. This guidance was deferred by ASU 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the effective date, issued by the FASB in August 2015, which deferred the effective date of ASU 2014-09 from annual and interim periods beginning after December 15, 2017 to annual and interim periods beginning after December 15, 2018. In March 2016, the FASB issued ASU 2016-08, Revenue from Contracts with Customers: Principal versus Agent Considerations, which further clarifies the implementation guidance in ASU 2014-09. In April 2016, the FASB issued ASU 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing, to expand the guidance on identifying performance obligations and licensing within ASU 2014-09. In May 2016, the FASB issued ASU 2016-12, Revenues from Contracts with Customers: Narrow-Scope Improvements and Practical Expedients, which amends the guidance in the new revenue standard on collectability, noncash consideration, presentation of sales tax, and transition. The amendments are intended to address implementation issues that were raised by stakeholders and provide additional practical expedients to reduce the cost and complexity of applying the new revenue standard. The guidance can be applied on a full retrospective or modified retrospective basis whereby the entity records a cumulative effect of initially applying this update at the date of initial application. In December 2016, the FASB issued ASU 2016-20, “Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers” intended to clarify the codification or to correct unintended application of the guidance which clarifies the definition of loan guarantee fees, what should be considered in contract costs impairment testing, a requirement that provisions for losses on construction-type and production-type contracts be determined at the least at the contract level, exclusion of insurance contracts from scope, specific disclosures regarding remaining performance obligations, disclosure of prior-period performance obligations and gives an example of contract modifications. These standards are required to be implemented by the Company for its fiscal year beginning January 1, 2019, including interim periods within that reporting period. In the third quarter of 2017, we initiated a request for proposal to identify a firm to assist the Company in evaluating the impact of this new standard. During the first quarter of 2018, we selected our service provider and commenced a process to evaluate the impact of the new pronouncement on our contracts, including identifying potential differences that would result from applying the requirements of the new guidance. We have made progress in reviewing our various types of revenue arrangements and expect to be substantially complete with such review in the second quarter of 2018. The guidance permits the use of one of two retrospective transition methods. We anticipate adopting the standard on January 1, 2019 using the modified retrospective method. The impact on our consolidated financial statements upon adoption of ASU 2014-09 will be determined in large part by the contracts in progress on our adoption date. As we have not yet concluded our review of the various types of revenue arrangements, we are unable to estimate the impact of this standard’s adoption on the Condensed Consolidated Financial Statements. In February 2016, FASB issued ASU No. 2016-02, “Leases (Topic 842),” ASU 2016-02 provides an approach for classifying leases as either finance leases or operating leases. For either classification, a right-of-use asset and a lease liability will be required to be recognized, unless the term of the lease is one year or less. The guidance is required to be applied using a modified retrospective approach which includes optional practical expedients. In January 2018, FASB issued ASU No. 2018-01, “Leases (Topic 842),” that clarified the standard by providing a practical expedient in transition to not evaluate existing or expired land easements under Topic 842 that were not previously accounted for as leases under Topic 840. These standards are effective for annual periods beginning after December 15, 2019, and for interim periods within fiscal years beginning after December 15, 2020. Earlier application is permitted. Management has not yet commenced its analysis of these standards and therefore cannot estimate the impact of their adoption on the Condensed Consolidated Financial Statements. In November 2016, the FASB issued ASU 2016-18, “Statement of Cash Flows: Restricted Cash” to address diversity in practice in the classification and presentation of changes in restricted cash on the statement of cash flows. The guidance is effective for financial statements issued for annual periods beginning after December 15, 2018, and for interim periods beginning after December 15, 2019. Early adoption is permitted, including adoption in an interim period. If an entity early adopts the amendments in an interim period, any adjustments should be reflected as of the beginning of the year that includes that interim period. An entity that elects early adoption must adopt all of the amendments in the same period. The amendments should be applied using a retrospective transition method to each period presented. When adopted, this standard is expected to have no material impact on the Condensed Consolidated Financial Statements. In January 2017, the FASB issued ASU 2017-01, “Business Combinations (Topic 805): Clarifying the Definition of a Business” to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The amendments provide a screen to determine when a set of assets and activities is not a business. If the screen is not met, the amendments require further consideration of inputs, substantive processes and outputs to determine whether the transaction is an acquisition of a business. This guidance is effective for financial statements issued for annual periods beginning after December 15, 2018, and for interim periods within annual periods beginning after December 15, 2019. The amendments in this update are to be applied prospectively on or after the effective date. Management is currently evaluating this standard to determine the impact on the Condensed Consolidated Financial Statements. In January 2017, the FASB issued ASU 2017-04, “Intangibles–Goodwill and Other - Simplifying the Test for Goodwill Impairment” to address the cost and complexity of the goodwill impairment test which resulted in the elimination of Step 2 from the goodwill impairment test. Step 2 measured a goodwill impairment loss by comparing the implied fair value of goodwill by assigning fair value of a reporting unit to all of its assets and liabilities as if that reporting unit had been acquired in a business combination. Rather, the Company would be required to do its annual and interim goodwill impairment tests by comparing the fair value of the reporting unit with its carrying amount and to recognize an impairment charge for the amount by which the carrying amount is greater than the reporting unit’s fair value, not to exceed the total amount of goodwill allocated to that reporting unit. Income tax effects measuring the goodwill impairment loss, if applicable, from any tax deductible goodwill on the carrying amount on the reporting unit should also be considered. The guidance is effective for financial statements issued for its annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2021. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. The amendments in this Update are to be applied on a prospective basis. Management expects to adopt this standard in the fourth quarter of 2018 when the Company performs its annual impairment testing. The adoption of this standard is expected to have no material impact on the Condensed Consolidated Financial Statements. On May 10, 2017, the FASB issued ASU 2017-09, Compensation – Stock Compensation: Scope of Modification Accounting (“ASU 2017-09”). The amendments included in ASU 2017-09 provide guidance about which changes to the terms and conditions of a share-based payment award require an entity to apply modification accounting. The amendments in this update will be applied prospectively to an award modified on or after the adoption date. On January 1, 2018, the Company adopted the provisions of ASU 2017-09 and the adoption did not have an impact on the Condensed Consolidated Financial Statements.

Accounts Receivable and Allowan

Accounts Receivable and Allowance for Doubtful Accounts	3 Months Ended
	Mar. 31, 2018
Receivables [Abstract]
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]	Note 4 – Accounts Receivable and Allowance for Doubtful Accounts (in thousands) March 31, 2018 December 31, 2017 Accounts receivable $ 100,675 $ 103,506 Retainage 26,404 26,070 Allowance for doubtful accounts (236) (233) Accounts receivable, net $ 126,843 $ 129,343

Contracts in Progress

Contracts in Progress	3 Months Ended
	Mar. 31, 2018
Property, Plant and Equipment [Abstract]
Contracts In Progress [Text Block]	Note 5 – Contracts in Progress (in thousands) March 31, 2018 December 31, 2017 Revenue earned on uncompleted contracts $ 571,474 $ 557,164 Less: Billings to date (572,686) (552,701) Net underbilling (overbilling) $ (1,212) 4,463 The above is reflected in the accompanying condensed consolidated balance sheets as follows: Costs and estimated earnings in excess of billing on uncompleted contracts $ 29,969 $ 33,006 Billings in excess of costs and estimated earnings on uncompleted contracts (31,181) (28,543) Net underbilling (overbilling) $ (1,212) $ 4,463 Accounts payable includes retainage due to subcontractors totaling $ 11.5 11.1 The Company has asserted claims and may have unapproved change orders on certain construction projects. These occur typically as a result of scope changes and project delays. Management continually evaluates these items and estimates the recoverable amounts and, if significant, these recoverability estimates are evaluated to determine the net realizable value. If additional amounts are recovered, additional contract revenue would be recognized. For the three months ended March 31, 2018, we recorded revisions in our contract estimates for five construction projects resulting in gross profit write downs totaling $3.7 million, as well as a single service project write down totaling $0.9 million. The Company is evaluating potential recovery options for some of the write downs recognized in the three months ended March 31, 2018, but is not currently in a position to recognize any potential recoveries in its financial statements.

Goodwill and Intangibles

Goodwill and Intangibles	3 Months Ended
	Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets Disclosure [Text Block]	Note 6 – Goodwill and Intangibles (in thousands) Gross Accumulated Net intangible March 31, 2018 Amortized intangible assets: Backlog – Construction $ 4,830 $ (4,466) $ 364 Customer Relationships – Service 4,710 (1,558) 3,152 Favorable Leasehold Interests 530 (116) 414 Total amortized intangible assets 10,070 (6,140) 3,930 Unamortized intangible assets: Trade Name 9,960 - 9,960 Total unamortized intangible assets 9,960 - 9,960 Total amortized and unamortized assets, excluding goodwill $ 20,030 $ (6,140) $ 13,890 Goodwill $ 10,488 $ - $ 10,488 (in thousands) Gross Accumulated Net intangible December 31, 2017 Amortized intangible assets: Backlog – Construction $ 4,830 $ (4,347) $ 483 Backlog – Service 880 (880) - Customer Relationships – Service 4,710 (1,359) 3,351 Favorable Leasehold Interests 530 (99) 431 Total amortized intangible assets 10,950 (6,685) 4,265 Unamortized intangible assets: Trade Name 9,960 - 9,960 Total unamortized intangible assets 9,960 - 9,960 Total amortized and unamortized assets, excluding goodwill $ 20,910 $ (6,685) $ 14,225 Goodwill $ 10,488 $ - $ 10,488 The definite-lived intangible assets are amortized over the period the Company expects to receive the related economic benefit, which for customer relationships is based upon estimated future net cash inflows. The Company has previously determined that its trade name has an indefinite useful life. The Limbach trade name has been in existence since the Company’s founding in 1901 and therefore is an established brand within the industry. Total amortization expense for these amortizable intangible assets was $ 0.3 1.0

Debt

Debt	3 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	Note 7 – Debt (in thousands) March 31, December 31, Credit Agreement – revolver $ 12,105 $ 5,658 Bridge Term Loan – term loan payable in quarterly installments of principal, plus interest through 2019 9,750 - Credit Agreement – term loan payable in quarterly installments of principal, plus interest through 2021 16,885 17,635 Capital leases – collateralized by vehicles, payable in monthly installments of principal, plus interest ranging from 4.9% to 5.3% through 2022 4,073 3,830 Total debt 42,813 27,123 Less - Current portion (7,301) (6,358) Less - Debt issuance costs (324) (209) Long-term debt $ 35,188 $ 20,556 Credit Agreement In 2016, a subsidiary of the Company, Limbach Facility Services LLC (“LFS”), entered into a new senior credit facility with multiple lenders (the “Credit Agreement”). The Credit Agreement consists of a $ 25.0 24.0 750,000 June 30, 2018 900,000 7.5 7.0 Mandatory prepayments are required upon the occurrence of certain events, including, among other things and subject to certain exceptions, equity issuances, changes of control of the Company, certain debt issuances, assets sales and excess cash flow. Commencing with the fiscal year ended December 31, 2017, the Company was required to remit an amount equal to 50% of the excess cash flow (as defined in the Credit Agreement) of the Company, which percentage will be reduced based on the Senior Leverage Ratio (as defined therein). The Company is required to remit an excess cash flow payment of $ 1.2 The Credit Agreement includes restrictions on, among other things and subject to certain exceptions, the Company and its subsidiaries’ ability to incur additional indebtedness, pay dividends or make other distributions, redeem or purchase capital stock, make investments and loans and enter into certain transactions, including selling assets, engaging in mergers or acquisitions and entering into transactions with affiliates. On January 12, 2018, LFS and LHLLC entered into the Second Amendment and Limited Waiver to the Credit Agreement (the “Second Amendment and Limited Waiver”) with the lenders party thereto and Fifth Third Bank, as administrative agent and L/C issuer. The Second Amendment and Limited Waiver provides for a new term loan under the Credit Agreement in the aggregate principal amount of $ 10,000,000 280,000 10.0 0.9 Loans under the Credit Agreement bear interest, at the Borrower’s option, at either Adjusted LIBOR (“Eurodollar”) or a base rate (“Base Rate”), in each case, plus an applicable margin. With respect to the Bridge Term Loan, from January 12, 2018 to, but excluding, the sixth month anniversary thereof, the applicable margin with respect to any Base Rate loan will be 4.00% per annum and with respect to any Eurodollar loan will be 5.00% per annum. From the six-month anniversary of January 12, 2018 to, but excluding, the 12-month anniversary thereof, the applicable margin with respect to any Base Rate loan will be 4.50% per annum and with respect to any Eurodollar loan will be 5.50% per annum. From the 12-month anniversary of January 12, 2018 and all times thereafter, the applicable margin with respect to any Base Rate loan will be 5.00% per annum and with respect to a Eurodollar loan will be 6.00% per annum. The Borrower is required to make principal payments on the Bridge Term Loan in the amount of $ 250,000 On March 21, 2018, the Company, LFS and LHLLC entered into the Third Amendment to Credit Agreement (the “Third Amendment”) with the lenders party thereto and Fifth Third Bank, as administrative agent and L/C Issuer. The Third Amendment provides for an increase in the amount that may be drawn against the Credit Agreement Revolver for the issuances of letters of credit from $ 5.0 8.0 The Credit Agreement requires that the Company comply with certain financial performance covenants including the following: (1) a senior leverage ratio not to exceed 2.75 1.25 (1.15 at June 30, 2018) 8.0 25 3.01 2.75 1.33 is noncompliance as of March 31, 2018 and lowered the fixed charge coverage ratio for June 30, 2018, As a result of having obtained a waiver, management estimates no impact of this covenant violation on the Company’s financial condition and liquidity . The equity interests of the Company’s subsidiaries have been pledged as security for the obligations under the Credit Agreement. The Credit Agreement includes customary events of default, including, among other items, payment defaults, cross-defaults to other indebtedness, a change of control default and events of default with respect to certain material agreements. Additionally, with respect to the Company, an event of default occurs if the Company’s securities cease to be registered with the SEC pursuant to Section 12(b) of the Securities and Exchange Act of 1934, as amended (the “Exchange Act”). In case of an event of default, the administrative agent would be entitled to, among other things, accelerated payment of amounts due under the Credit Agreement, foreclose on the equity of the Company’s subsidiaries, and exercise all rights of a secured creditor on behalf of the lenders. The additional margin applied to both the revolver and term loan is determined based on levels achieved under the Company’s senior leverage ratio covenant, which reflects the ratio of indebtedness divided by EBITDA for the most recently ended four quarters. Level Senior Leverage Ratio Additional Margin for Additional Margin for Commitment Fee I Greater than or equal to 2.50 to 1.00 3.00 % 4.00 % 0.50 % II Less than 2.50 to 1.00, but greater than or equal to 2.00 to 1.00 2.75 % 3.75 % 0.50 % III Less than 2.00 to 1.00, but greater than or equal to 1.50 to 1.00 2.50 % 3.50 % 0.50 % IV Less than 1.50 to 1.00 2.25 % 3.25 % 0.50 % The Company had $ 9.3

Equity

Equity	3 Months Ended
	Mar. 31, 2018
Stockholders' Equity Note [Abstract]
Stockholders' Equity Note Disclosure [Text Block]	The Company’s second amended and restated certificate of incorporation currently authorizes the issuance of 100,000,000 0.0001 1,000,000 0.0001 At March 31, 2018, the Company had outstanding warrants exercisable for 4,576,799 4,600,000 11.50 198,000 5.75 11.50 600,000 15.00 15 631,119 12.50 946,680 11.50 4,659,472 The Public Warrants, Sponsor Warrants and $ 15 10,627 49,604 Additional 33,069 On July 21, 2014, a total of 300,000 121,173 282,900 17,100 11.50 On August 30, 2017, the Compensation Committee of the Board of Directors of the Company granted an aggregate of 438,800 800,000

Cumulative Redeemable Convertib

Cumulative Redeemable Convertible Preferred Stock	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Preferred Stock [Text Block]	Note 9 – Cumulative Redeemable Convertible Preferred Stock In connection with the Business Combination, the Company issued 400,000 Each share of Preferred Stock was convertible (at the holder’s election) into two shares of the Company’s common stock (as may be adjusted for any stock splits, reverse stock splits or similar transactions), representing a conversion price of $12.50 per share; preferential dividends at a rate of: (i) 8% per annum in years one through three from issuance; (ii) 10% per annum in years four through five from issuance; and (iii) 12% per annum thereafter, payable in equal quarterly installments. On July 14, 2017, the Company entered into a preferred stock repurchase agreement (the “Preferred Stock Repurchase Agreement”) with 1347 Investors pursuant to which (a) the Company repurchased from 1347 Investors a total of 120,000 4.1 509,500 This repurchase was funded through permitted borrowings under the Company’s revolving credit facility and closed on July 14, 2017. The Company has retired the repurchased shares. As discussed in Note 7 – Debt, on January 12, 2018, the Company exercised its repurchase right with respect to the remaining 280,000 10.0 2.2 0.9

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Disclosures [Text Block]	Note 10 – Fair Value Measurements The Company measures the fair value of financial assets and liabilities in accordance with ASC Topic 820 – Fair Value Measurements and Disclosures, which defines fair value, establishes a framework for measuring fair value and expands disclosures about fair value measurements. ASC Topic 820 establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value and requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to measurements involving significant unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy are as follows: • Level 1 — inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities that are accessible at the measurement date; • Level 2 — inputs other than quoted prices included in Level 1 that are observable for the asset or liability either directly or indirectly such as quoted prices in active markets for similar assets and liabilities, quoted prices for identical or similar assets or liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of assets or liabilities; and • Level 3 — unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions. The Company believes that the carrying amounts of its financial instruments, including cash and cash equivalents, trade accounts receivable and accounts payable consist primarily of instruments without extended maturities, which approximate fair value primarily due to their short-term maturities and low risk of counterparty default. We also believe that the carrying value of the Credit Agreement term loan approximates its fair value due to the variable rate on such debt. As of March 31, 2018, the Company determined the fair value of its Credit Agreement term loan at $ 16.9 12.1 9.8 To determine the fair value of the warrants issued in connection with the Business Combination, the Company utilized the Black-Scholes model.

Earnings per Share

Earnings per Share	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Earnings Per Share [Text Block]	Note 11 – Earnings per Share Diluted EPS assumes the dilutive effect of outstanding common stock warrants, unit purchase options (“UPOs”) and RSUs, all using the treasury stock method, and the dilutive effect of the Class A Preferred Stock, using the “if-converted” method. Three months ended (in thousands, except per share amounts) March 31, 2018 March 31, 2017 EPS numerator: Net loss $ (2,424) $ (1,214) Less: Premium paid on redemption of redeemable convertible preferred stock 2,219 - Less: Dividends on cumulative redeemable convertible preferred stock (113) 238 Net loss attributable to Limbach Holdings, Inc. common stockholders $ (4,530) $ (1,452) EPS denominator: Weighted average shares outstanding – basic 7,541 7,455 Weighted average shares outstanding – diluted 7,541 7,455 Basic EPS attributable to common stockholders: Net loss attributable to Limbach Holdings, Inc. common stockholders $ (0.60) $ (0.19) Diluted EPS attributable to common stockholders: Net loss attributable to Limbach Holdings, Inc. common stockholders $ (0.60) $ (0.19) Three months ended (in thousands) March 31, 2018 March 31, 2017 Warrants (See Note 8) 387,437 680,607 Class A Preferred stock (See Note 9) 68,444 800,000 Stock-based compensation (See Note 17) 46,948 - UPOs (See Note 8) 5,176 6,913 Total 508,005 1,487,520

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	Note 12 – Income Taxes The Company is taxed as a C corporation. For interim periods, the provision for income taxes (including federal, state, local and foreign taxes) is calculated based on the estimated annual effective tax rate and consists of the following: Three months ended (in thousands) March 31, 2018 March 31, 2017 Deferred income tax benefit U.S. Federal (759) (887) State and local (284) (196) Total deferred income tax benefit (1,043) (1,083) Income tax benefit $ (1,043) $ (1,083) No current tax provision (benefit) was recorded for the three month periods ended March 31, 2018 and 2017. No valuation allowance was required as of March 31, 2018 or December 31, 2017. The Company performed an analysis of its tax positions and determined that no material uncertain tax positions exist. Accordingly, there is no liability for uncertain tax positions as of March 31, 2018 or December 31, 2017. Based on the provisions of ASC Topic 740 - Income Taxes, the Company had no material unrecognized tax benefits as of March 31, 2018 and December 31, 2017. Three months ended March 31, 2018 March 31, 2017 Federal statutory income tax rate 21.0 % 34.0 % State income taxes, net of federal tax effect 5.5 % 4.6 % Nondeductible/nontaxable items 4.5 % 4.1 % Tax credits (0.9) % - Effective tax rate 30.1 % 42.7 %

Operating Segments

Operating Segments	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Segment Reporting Disclosure [Text Block]	Note 13 – Operating Segments The Company determined its operating segments on the same basis that it assesses performance and makes operating decisions. The Company manages and measures the performance of its business in two distinct operating segments: Construction and Service. These segments are reflective of how the Company's Chief Operating Decision Maker ("CODM") reviews operating results for the purposes of allocating resources and assessing performance. The Company's CODM is comprised of its Chief Executive Officer, Chief Financial Officer and Chief Operating Officer. The accounting policies of the segments are the same as those described in the summary of significant accounting policies. The CODM evaluates performance based on income from operations of the respective segments after the allocation of Corporate office operating expenses. In accordance with ASC Topic 280 – Segment Reporting, the Company has elected to aggregate all of the construction branches into one Construction reportable segment and all of the service branches into one Service reportable segment. All transactions between segments are eliminated in consolidation. Our Corporate department provides general and administrative support services to our two operating segments. The CODM allocates costs between segments for selling, general and administrative expenses and depreciation expense. All of the Company’s identifiable assets are located in the United States, which is where the Company is domiciled. The Company does not have sales outside the United States. The Company does not identify capital expenditures and total assets, including goodwill, by segment in its internal financial reports due in part to the shared use of a centralized fleet of vehicles and specialized equipment. Interest expense is not allocated to segments because of the corporate management of debt service including interest. Three months ended (in thousands) March 31, 2018 March 31, 2017 Statement of Operations Data: Revenue: Construction $ 96,810 $ 91,465 Service 23,739 23,725 Total revenue 120,549 115,190 Gross profit: Construction 9,271 8,949 Service 4,016 4,820 Total gross profit 13,287 13,769 Selling, general and administrative expenses: Construction 7,866 7,281 Service 4,019 3,451 Corporate 3,781 3,835 Total selling, general and administrative expenses 15,666 14,567 Amortization of intangibles 335 1,008 Operating loss $ (2,714) $ (1,806) Operating loss for reportable segments $ (2,714) $ (1,806) Less unallocated amounts: Interest expense, net 769 454 (Gain) loss on sale of property and equipment (16) 37 Total unallocated amounts 753 491 Total consolidated loss before income taxes $ (3,467) $ (2,297) Other Data: Depreciation and amortization: Construction $ 666 $ 978 Service 180 489 Corporate 525 1,179 Total other data $ 1,371 $ 2,646

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure [Text Block]	Note 14 – Commitments and Contingencies Leases. Capital leases consist primarily of leases for vehicles (see Note 7 – Debt). The leases require monthly payments of principal and interest. All leases transfer title at lease end for a nominal cash buyout. Legal. Limbach Facility Services LLC (“LFS”) and Harper Limbach LLC (“Harper”), wholly owned subsidiaries of the Company, are parties to a lawsuit involving a Harper employee who was alleged to be in the course and scope of his employment at the time the personal car he was operating collided with another car causing injuries to three persons and one fatality. The plaintiffs have made settlement demands within LFS and Harper’s insurance coverage limits. Insurance companies for LFS and Harper countered with lower amounts that were not accepted. The Company currently has no estimate of when a trial in this matter may take place or to what extent settlement discussions may continue. The Company cannot reasonably estimate a range of loss at this time and does not believe the outcome will have a material impact on the Company. During the first quarter of 2018, the court granted plaintiffs’ motion to amend their complaint to add claims for punitive damages against LFS and Harper. The amount of punitive damages, if awarded, could be material. The Company intends to vigorously oppose the claims for punitive damages and will file an appeal after trial if punitive damages are awarded. Based on the existence of several significant uncertainties related to punitive damages, the Company cannot currently predict an outcome in this matter and is unable to reasonably estimate a range of loss at this time. Surety. Collective Bargaining Agreements.

Self-Insurance

Self-Insurance	3 Months Ended
	Mar. 31, 2018
Insurance [Abstract]
Insurance Disclosure [Text Block]	Note 15 – Self-Insurance The Company purchases workers' compensation and general liability insurance under policies with per-incident deductibles of $ 250 2.8 (in thousands) As of As of Current liability — workers' compensation and general liability $ 392 $ 408 Current liability — medical and dental 506 508 Non-current liability 569 412 Total liability shown in Accrued expenses and other liabilities $ 1,467 $ 1,328 Restricted cash $ 113 $ 113 The restricted cash balance represents an imprest cash balance set aside for the funding of workers' compensation and general liability insurance claims. This amount is replenished either when depleted or at the beginning of each month.

Backlog

Backlog	3 Months Ended
	Mar. 31, 2018
Backlog [Abstract]
Backlog Disclosure [Text Block]	Note 16 – Backlog At March 31, 2018 and December 31, 2017, the Company's contractual Construction backlog, which represents the amount of revenue the Company expects to realize from work to be performed on uncompleted construction contracts in progress, was $ 413.9 426.7 38.6 34.7

Management Incentive Plans

Management Incentive Plans	3 Months Ended
	Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Management Incentive Plan Disclosure [Text Block]	Upon approval of the Business Combination, the Company adopted the Limbach Holdings, Inc. Omnibus Incentive Plan (the “2016 Plan”). Certain employees, directors and consultants will be eligible to be granted awards under the 2016 Plan, other than incentive stock options, which may be granted only to employees. The Company has reserved 800,000 Service-Based Awards In 2017, the Company granted 226,867 Awards Weighted-Average Unvested at December 31, 2017 176,965 $ 13.25 Granted - - Vested (26,422) 13.25 Forfeited (2,667) 13.25 Unvested at March 31, 2018 147,876 $ 13.25 Performance-Based Awards In 2017, the Company granted 66,500 The Company will recognize stock-based compensation expense for these awards over the vesting period based on the projected probability of achievement of the aforementioned performance conditions as of the end of each reporting period during the performance period and may periodically adjust the recognition of such expense, as necessary, in response to any changes in the Company’s forecasts with respect to the performance conditions. For the quarter ended March 31, 2018, the Company did not recognize any stock-based compensation expense related to these awards. The following table summarizes our PRSU activity for the quarter ended March 31, 2018: Awards Weighted-Average Unvested at December 31, 2017 66,500 $ 13.25 Granted - - Vested - - Forfeited (2,000) 13.25 Unvested at March 31, 2018 64,500 $ 13.25 Market-Based Awards In 2017, the Company granted 146,500 The following table summarizes our MRSU activity for the quarter ended March 31, 2018: Awards Weighted-Average Unvested at December 31, 2017 146,500 $ 6.58 Granted - - Vested - - Forfeited (2,000) 6.58 Unvested at March 31, 2018 144,500 $ 6.58 Total recognized stock-based compensation expense amounted to $ 0.5 1.8 1.59

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Note 18 – Subsequent Events In April 2018, the Company granted 60,000 60,000 17,067 On May 15, 2018, the Company, LFS and LHLLC entered into the Fourth Amendment to Credit Agreement and Limited Waiver (the “Fourth Amendment and Limited Waiver”) with the lenders party thereto and Fifth Third Bank, as administrative agent and L/C Issuer. The Fourth Amendment and Limited Waiver amends the existing covenants to include additional information covenants, such as work in process reports and monthly cash flow schedules. In addition, the amendment requires a fixed charge coverage ratio of not less than 1.15

Significant Accounting Polici25

Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	Basis of Presentation Condensed Financial Statements The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with instructions to the Quarterly Report on Form 10-Q and Rule 8-03 of Regulation S-X for smaller reporting companies. Consequently, certain information and note disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”) have been condensed or omitted pursuant to those rules and regulations, although the Company believes that the disclosures made are adequate to make the information not misleading. Readers of this report should refer to the consolidated financial statements and the notes thereto included in our latest Annual Report on Form 10-K filed with the Securities and Exchange Commission (“SEC”) on April 2, 2018.
Unaudited Interim Financial Information [Policy Text Block]	The accompanying interim Condensed Consolidated Balance Sheets, Condensed Consolidated Statements of Operations, Condensed Consolidated Statement of Stockholders’ Equity and the Condensed Consolidated Statements of Cash Flows for the periods presented are unaudited. Also, within the notes to the Condensed Consolidated Financial Statements, we have included unaudited information for these interim periods. These unaudited interim Condensed Consolidated Financial Statements have been prepared in accordance with GAAP. In our opinion, the accompanying unaudited condensed consolidated financial statements contain all adjustments (consisting only of a normal recurring nature) necessary for a fair statement of the Company’s financial position as of March 31, 2018, and its results of operations and its cash flows for the periods presented. The results for the three months ended March 31, 2018 are not necessarily indicative of the results to be expected for the year ending December 31, 2018. The Condensed Consolidated Balance Sheet as of December 31, 2017 was derived from our audited financial statements filed with the SEC on April 2, 2018, but is presented as condensed and does not contain all of the footnote disclosures from the annual financial statements.
Revenue Recognition, Policy [Policy Text Block]	Revenues from construction fixed price and modified fixed price contracts are recognized on the percentage-of-completion method, measured by the relationship of total cost incurred to total estimated contract costs (cost-to-cost method). Contract revenue for long-term construction contracts is based upon management's estimate of contract values at completion, including revenue for additional work on which the contract value has not been finalized (claims and unapproved change orders) but is considered probable. Changes in job performance, job conditions, and estimated profitability, including those arising from contract penalty provisions and final contract settlements, may result in revisions to estimated costs and income, and are recognized in the period in which the revisions are determined. There are two basic types of service contracts: fixed price service contracts which are signed in advance for maintenance, repair, and retrofit work over a period of typically one year, and service contracts not signed in advance for similar maintenance, repair, and retrofit work performed on an as-needed basis. Fixed price service contracts are generally performed evenly over the contract period, and accordingly, revenue is recognized on a pro rata basis over the life of the contract. Revenues derived from other service contracts are recognized when the services are performed. Expenses related to all service contracts are recognized as services are provided. Costs and estimated earnings in excess of billings on uncompleted contracts reflected in the Condensed Consolidated Financial Statements arise when revenues have been recognized but the amounts cannot be billed under the terms of the contracts. Also included in costs and estimated earnings on uncompleted contracts are amounts the Company seeks or will seek to collect from customers or others for errors or changes in contract specifications or design, contract change orders in dispute or unapproved as to scope and price, or other customer-related causes of unanticipated additional contract costs (claims and unapproved change orders). Such amounts are recorded at estimated net realizable value when realization is probable and can be reasonably estimated. No profit is recognized on the construction costs incurred in connection with claim amounts. Claims and unapproved change orders made by the Company may involve negotiation and, in rare cases, litigation. Claims and unapproved change orders involve the use of estimates, and it is reasonably possible that revisions to the estimated recoverable amounts of recorded claims and unapproved change orders may be made in the near term. Claims against the Company are recognized when a loss is considered probable and amounts are reasonably determinable. Billings in excess of costs and estimated earnings on uncompleted contracts represent billings in excess of revenues recognized. In accordance with industry practice, we classify as current all assets and liabilities relating to the performance of contracts. The terms of our contracts generally range from six months to two years. Selling, general, and administrative costs are charged to expense as incurred. Bidding and proposal costs are also recognized as an expense in the period in which such amounts are incurred.

Accounts Receivable and Allow26

Accounts Receivable and Allowance for Doubtful Accounts (Tables)	3 Months Ended
	Mar. 31, 2018
Receivables [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]	Accounts receivable and the allowance for uncollectible accounts are comprised of the following: (in thousands) March 31, 2018 December 31, 2017 Accounts receivable $ 100,675 $ 103,506 Retainage 26,404 26,070 Allowance for doubtful accounts (236) (233) Accounts receivable, net $ 126,843 $ 129,343

Contracts in Progress (Tables)

Contracts in Progress (Tables)	3 Months Ended
	Mar. 31, 2018
Property, Plant and Equipment [Abstract]
Schedule Of Contracts In Progress [Table Text Block]	(in thousands) March 31, 2018 December 31, 2017 Revenue earned on uncompleted contracts $ 571,474 $ 557,164 Less: Billings to date (572,686) (552,701) Net underbilling (overbilling) $ (1,212) 4,463 The above is reflected in the accompanying Condensed Consolidated Balance Sheets as follows: Costs and estimated earnings in excess of billing on uncompleted contracts $ 29,969 $ 33,006 Billings in excess of costs and estimated earnings on uncompleted contracts (31,181) (28,543) Net underbilling (overbilling) $ (1,212) $ 4,463

Goodwill and Intangibles (Table

Goodwill and Intangibles (Tables)	3 Months Ended
	Mar. 31, 2018
Schedule of Intangible Assets and Goodwill [Table Text Block]	Goodwill and intangible assets are comprised of the following: (in thousands) Gross Accumulated Net intangible March 31, 2018 Amortized intangible assets: Backlog – Construction $ 4,830 $ (4,466) $ 364 Customer Relationships – Service 4,710 (1,558) 3,152 Favorable Leasehold Interests 530 (116) 414 Total amortized intangible assets 10,070 (6,140) 3,930 Unamortized intangible assets: Trade Name 9,960 - 9,960 Total unamortized intangible assets 9,960 - 9,960 Total amortized and unamortized assets, excluding goodwill $ 20,030 $ (6,140) $ 13,890 Goodwill $ 10,488 $ - $ 10,488 (in thousands) Gross Accumulated Net intangible December 31, 2017 Amortized intangible assets: Backlog – Construction $ 4,830 $ (4,347) $ 483 Backlog – Service 880 (880) - Customer Relationships – Service 4,710 (1,359) 3,351 Favorable Leasehold Interests 530 (99) 431 Total amortized intangible assets 10,950 (6,685) 4,265 Unamortized intangible assets: Trade Name 9,960 - 9,960 Total unamortized intangible assets 9,960 - 9,960 Total amortized and unamortized assets, excluding goodwill $ 20,910 $ (6,685) $ 14,225 Goodwill $ 10,488 $ - $ 10,488

Debt (Tables)

Debt (Tables)	3 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
Schedule of Debt [Table Text Block]	Long-term debt consists of the following obligations as of: (in thousands) March 31, December 31, Credit Agreement – revolver $ 12,105 $ 5,658 Bridge Term Loan – term loan payable in quarterly installments of principal, plus interest through 2019 9,750 - Credit Agreement – term loan payable in quarterly installments of principal, plus interest through 2021 16,885 17,635 Capital leases – collateralized by vehicles, payable in monthly installments of principal, plus interest ranging from 4.9% to 5.3% through 2022 4,073 3,830 Total debt 42,813 27,123 Less - Current portion (7,301) (6,358) Less - Debt issuance costs (324) (209) Long-term debt $ 35,188 $ 20,556
Senior Leverage ratio covenant [Table Text Block]	The following is a summary of the additional margin and commitment fees payable on the available revolving credit commitment: Level Senior Leverage Ratio Additional Margin for Additional Margin for Commitment Fee I Greater than or equal to 2.50 to 1.00 3.00 % 4.00 % 0.50 % II Less than 2.50 to 1.00, but greater than or equal to 2.00 to 1.00 2.75 % 3.75 % 0.50 % III Less than 2.00 to 1.00, but greater than or equal to 1.50 to 1.00 2.50 % 3.50 % 0.50 % IV Less than 1.50 to 1.00 2.25 % 3.25 % 0.50 %

Earnings per Share (Tables)

Earnings per Share (Tables)	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	Three months ended (in thousands, except per share amounts) March 31, 2018 March 31, 2017 EPS numerator: Net loss $ (2,424) $ (1,214) Less: Premium paid on redemption of redeemable convertible preferred stock 2,219 - Less: Dividends on cumulative redeemable convertible preferred stock (113) 238 Net loss attributable to Limbach Holdings, Inc. common stockholders $ (4,530) $ (1,452) EPS denominator: Weighted average shares outstanding – basic 7,541 7,455 Weighted average shares outstanding – diluted 7,541 7,455 Basic EPS attributable to common stockholders: Net loss attributable to Limbach Holdings, Inc. common stockholders $ (0.60) $ (0.19) Diluted EPS attributable to common stockholders: Net loss attributable to Limbach Holdings, Inc. common stockholders $ (0.60) $ (0.19)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]	Three months ended (in thousands) March 31, 2018 March 31, 2017 Warrants (See Note 8) 387,437 680,607 Class A Preferred stock (See Note 9) 68,444 800,000 Stock-based compensation (See Note 17) 46,948 - UPOs (See Note 8) 5,176 6,913 Total 508,005 1,487,520

Income Taxes (Tables)

Income Taxes (Tables)	3 Months Ended
	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	For interim periods, the provision for income taxes (including federal, state, local and foreign taxes) is calculated based on the estimated annual effective tax rate and consists of the following: Three months ended (in thousands) March 31, 2018 March 31, 2017 Deferred income tax benefit U.S. Federal (759) (887) State and local (284) (196) Total deferred income tax benefit (1,043) (1,083) Income tax benefit $ (1,043) $ (1,083)
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	A reconciliation of the federal statutory income tax rate to the Company’s effective tax rate is as follows: Three months ended March 31, 2018 March 31, 2017 Federal statutory income tax rate 21.0 % 34.0 % State income taxes, net of federal tax effect 5.5 % 4.6 % Nondeductible/nontaxable items 4.5 % 4.1 % Tax credits (0.9) % - Effective tax rate 30.1 % 42.7 %

Operating Segments (Tables)

Operating Segments (Tables)	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment [Table Text Block]	Three months ended (in thousands) March 31, 2018 March 31, 2017 Statement of Operations Data: Revenue: Construction $ 96,810 $ 91,465 Service 23,739 23,725 Total revenue 120,549 115,190 Gross profit: Construction 9,271 8,949 Service 4,016 4,820 Total gross profit 13,287 13,769 Selling, general and administrative expenses: Construction 7,866 7,281 Service 4,019 3,451 Corporate 3,781 3,835 Total selling, general and administrative expenses 15,666 14,567 Amortization of intangibles 335 1,008 Operating loss $ (2,714) $ (1,806) Operating loss for reportable segments $ (2,714) $ (1,806) Less unallocated amounts: Interest expense, net 769 454 (Gain) loss on sale of property and equipment (16) 37 Total unallocated amounts 753 491 Total consolidated loss before income taxes $ (3,467) $ (2,297) Other Data: Depreciation and amortization: Construction $ 666 $ 978 Service 180 489 Corporate 525 1,179 Total other data $ 1,371 $ 2,646

Self-Insurance (Tables)

Self-Insurance (Tables)	3 Months Ended
	Mar. 31, 2018
Insurance [Abstract]
Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block]	The components of the self-insurance liability as of March 31, 2018 and December 31, 2017 are as follows: (in thousands) As of As of Current liability — workers' compensation and general liability $ 392 $ 408 Current liability — medical and dental 506 508 Non-current liability 569 412 Total liability shown in Accrued expenses and other liabilities $ 1,467 $ 1,328 Restricted cash $ 113 $ 113

Management Incentive Plans (Tab

Management Incentive Plans (Tables)	3 Months Ended
	Mar. 31, 2018
Service Based Restricted Stock Units [Member]
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]	The following table summarizes our service-based RSU activity for the quarter ended March 31, 2018: Awards Weighted-Average Unvested at December 31, 2017 176,965 $ 13.25 Granted - - Vested (26,422) 13.25 Forfeited (2,667) 13.25 Unvested at March 31, 2018 147,876 $ 13.25
Performance Based Restricted Stock Units [Member]
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]	The following table summarizes our PRSU activity for the quarter ended March 31, 2018: Awards Weighted-Average Unvested at December 31, 2017 66,500 $ 13.25 Granted - - Vested - - Forfeited (2,000) 13.25 Unvested at March 31, 2018 64,500 $ 13.25
Market Based Awards [Member]
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]	The following table summarizes our MRSU activity for the quarter ended March 31, 2018: Awards Weighted-Average Unvested at December 31, 2017 146,500 $ 6.58 Granted - - Vested - - Forfeited (2,000) 6.58 Unvested at March 31, 2018 144,500 $ 6.58

Accounts Receivable and Allow35

Accounts Receivable and Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 100,675	$ 103,506
Retainage	26,404	26,070
Allowance for doubtful accounts	(236)	(233)
Accounts receivable, net	$ 126,843	$ 129,343

Contracts in Progress (Details)

Contracts in Progress (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Revenue earned on uncompleted contracts	$ 571,474	$ 557,164
Less: Billings to date	(572,686)	(552,701)
Net underbilling (overbilling)	(1,212)	4,463
Costs and estimated earnings in excess of billing on uncompleted contracts	29,969	33,006
Billings in excess of costs and estimated earnings on uncompleted contracts	(31,181)	(28,543)
Net underbilling (overbilling)	$ (1,212)	$ 4,463

Contracts in Progress (Details

Contracts in Progress (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Subcontract Payable Retainage	$ 11.5	$ 11.1
Five construction projects [Member]
Gross profit write down	3.7
Service project write down	0.9
Four construction projects [Member]
Gross profit write Up	$ 1.5

Goodwill and Intangibles (Detai

Goodwill and Intangibles (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets, Gross	$ 10,070	$ 10,950
Finite-Lived Intangible Assets, Accumulated Amortization	(6,140)	(6,685)
Finite-Lived Intangible Assets, Net	3,930	4,265
Indefinite-Lived Intangible Assets (Excluding Goodwill)	9,960	9,960
Intangible Assets Amortized Excluding Goodwill	9,960	9,960
Intangible Assets, Gross (Excluding Goodwill)	20,030	20,910
Intangible Assets, Net (Excluding Goodwill)	13,890	14,225
Goodwill, Gross	10,488	10,488
Goodwill, Impaired, Accumulated Impairment Loss	0	0
Goodwill	10,488	10,488
BackLog - Construction [Member]
Finite-Lived Intangible Assets, Gross	4,830	4,830
Finite-Lived Intangible Assets, Accumulated Amortization	(4,466)	(4,347)
Finite-Lived Intangible Assets, Net	364	483
BackLog - Service [Member]
Finite-Lived Intangible Assets, Gross		880
Finite-Lived Intangible Assets, Accumulated Amortization		(880)
Finite-Lived Intangible Assets, Net		0
Customer Relationships - Service [Member]
Finite-Lived Intangible Assets, Gross	4,710	4,710
Finite-Lived Intangible Assets, Accumulated Amortization	(1,558)	(1,359)
Finite-Lived Intangible Assets, Net	3,152	3,351
Favorable Leasehold Interests [Member]
Finite-Lived Intangible Assets, Gross	530	530
Finite-Lived Intangible Assets, Accumulated Amortization	(116)	(99)
Finite-Lived Intangible Assets, Net	414	431
Trade Names [Member]
Indefinite-Lived Intangible Assets (Excluding Goodwill)	9,960	9,960
Intangible Assets, Gross (Excluding Goodwill)	$ 9,960	$ 9,960

Goodwill and Intangibles (Det39

Goodwill and Intangibles (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Amortization of Intangible Assets	$ 335	$ 1,008
Goodwill	10,488		$ 10,488
Successor [Member]
Amortization of Intangible Assets	$ 300	$ 1,000

Debt (Details)

Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Long-term debt	$ 35,188	$ 20,556
Capital leases - collateralized by vehicles, payable in monthly installments of principal, plus interest ranging from 4.9% to 5.3% through 2022	4,073	3,830
Total debt	42,813	27,123
Less - Current portion	(7,301)	(6,358)
Less - Debt issuance costs	(324)	(209)
Long-term debt	35,188	20,556
Bridge Loan [Member]
Long-term debt	9,750	0
Long-term debt	9,750	0
Credit Agreement [Member] | Successor [Member]
Credit Agreement - revolver	12,105	5,658
Credit Agreement [Member] | Loans Payable [Member]
Long-term debt	16,885	17,635
Long-term debt	$ 16,885	$ 17,635

Debt (Details 1)

Debt (Details 1)	3 Months Ended
	Mar. 31, 2018
Level One [Member]
Debt Instrument, Covenant Description	Greater than or equal to 2.50 to 1.00
Line of Credit Facility, Commitment Fee Percentage	0.50%
Level One [Member] | Base Rate [Member]
Debt Instrument, Basis Spread on Variable Rate	3.00%
Level One [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	4.00%
Level Two [Member]
Debt Instrument, Covenant Description	Less than 2.50 to 1.00, but greater than or equal to 2.00 to 1.00
Line of Credit Facility, Commitment Fee Percentage	0.50%
Level Two [Member] | Base Rate [Member]
Debt Instrument, Basis Spread on Variable Rate	2.75%
Level Two [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	3.75%
Level Three [Member]
Debt Instrument, Covenant Description	Less than 2.00 to 1.00, but greater than or equal to 1.50 to 1.00
Line of Credit Facility, Commitment Fee Percentage	0.50%
Level Three [Member] | Base Rate [Member]
Debt Instrument, Basis Spread on Variable Rate	2.50%
Level Three [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	3.50%
Level Four [Member]
Debt Instrument, Covenant Description	Less than 1.50 to 1.00
Line of Credit Facility, Commitment Fee Percentage	0.50%
Level Four [Member] | Base Rate [Member]
Debt Instrument, Basis Spread on Variable Rate	2.25%
Level Four [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	3.25%

Debt (Details Textual)

Debt (Details Textual) - USD ($)	Jan. 12, 2018	Jul. 14, 2017	Mar. 31, 2018	Mar. 21, 2018	Dec. 31, 2017
Amount Requied To Remit Due to Excess Cash Flow			$ 1,200,000
Debt Instrument, Periodic Payment			$ 250,000
Stock Repurchased During Period, Shares		120,000
Debt Instrument, Maturity Date, Description	Loans under the Credit Agreement bear interest, at the Borrowers option, at either Adjusted LIBOR (Eurodollar) or a base rate (Base Rate), in each case, plus an applicable margin. With respect to the Bridge Term Loan, from January 12, 2018 to, but excluding, the sixth month anniversary thereof, the applicable margin with respect to any Base Rate loan will be 4.00% per annum and with respect to any Eurodollar loan will be 5.00% per annum. From the six-month anniversary of January 12, 2018 to, but excluding, the 12-month anniversary thereof, the applicable margin with respect to any Base Rate loan will be 4.50% per annum and with respect to any Eurodollar loan will be 5.50% per annum. From the 12-month anniversary of January 12, 2018 and all times thereafter, the applicable margin with respect to any Base Rate loan will be 5.00% per annum and with respect to a Eurodollar loan will be 6.00% per annum.
Debt Instrument, Repurchased Face Amount	$ 10,000,000
Dividends Payable	900,000
Maximum senior leverage ratio			2.75
Minimum Fixed charge coverage ratio			1.25
Increase in net worth, Percentage			25.00%
Maximum Fixed charge coverage ratio			1.33
Minimum Net Worth Required for Compliance			$ 8,000,000
Minimum [Member]
Senior leverage ratio			2.75
Maximum [Member]
Senior leverage ratio			3.01
Bridge Loan [Member]
Debt Instrument, Face Amount	$ 10,000,000
Debt Instrument, Interest Rate, Stated Percentage			7.00%
Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity			$ 9,300,000
Senior Credit Facility [Member]
Debt Instrument, Maturity Date			Jun. 30, 2018
Letter of Credit [Member]
Long-term Debt				$ 8,000,000	$ 5,000,000
Loans Payable [Member] | Senior Credit Facility [Member]
Debt Instrument, Periodic Payment, Principal			$ 750,000
Senior Credit Facility Agreement [Member]
Debt Instrument, Interest Rate, Stated Percentage			7.50%
Senior Credit Facility Agreement [Member] | Revolving Credit Facility [Member]
Debt Instrument, Face Amount			$ 24,000,000
Debt Instrument, Interest Rate, Stated Percentage			5.75%
Senior Credit Facility Agreement [Member] | Loans Payable [Member]
Debt Instrument, Face Amount			$ 25,000,000
Debt Instrument, Periodic Payment, Principal			$ 900,000
Preferred Class A [Member]
Stock Repurchased During Period, Shares	280,000

Equity (Details Textual)

Equity (Details Textual) - USD ($)	Jan. 08, 2018	Aug. 30, 2017	Dec. 07, 2016	Jul. 21, 2014	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Jul. 15, 2014
Common Stock, Shares Authorized					100,000,000		100,000,000
Common Stock, Par or Stated Value Per Share					$ 0.0001		$ 0.0001
Preferred Stock, Shares Authorized					1,000,000
Preferred Stock, Par or Stated Value Per Share					$ 0.0001
Class of Warrant or Right, Outstanding					4,576,799		4,659,472
Share-based Compensation					$ 467,000	$ 0
Unit Purchase Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross				300,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			282,900
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number					17,100
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		438,800
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized		800,000
Share-based Compensation					$ 500,000
Public warrants [Member]
Stock Issued During Period, Value, New Issues					$ 4,600,000
Sponsor Warrants [Member]
Class of Warrant or Right, Outstanding					198,000
Class of Warrant or Right, Exercise Price of Warrants or Rights For Half Share					5.75
Class of Warrant or Right, Exercise Price of Warrants or Rights					$ 11.50
Fifteen Dollar Exercise Price Warrants [Member]
Class of Warrant or Right, Outstanding					600,000
Class of Warrant or Right, Exercise Price of Warrants or Rights					$ 15
Merger Warrants [Member]
Class of Warrant or Right, Outstanding					631,119
Class of Warrant or Right, Number of Securities Called by Warrants or Rights					11.50
Class of Warrant or Right, Exercise Price of Warrants or Rights					$ 12.50
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	49,604
Additional Merger Warrants [Member]
Class of Warrant or Right, Outstanding					946,680
Class of Warrant or Right, Exercise Price of Warrants or Rights					$ 11.50
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	33,069
Predecessor [Member] | Public warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights					$ 15
Predecessor [Member] | Sponsor Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights								$ 15
Common Stock [Member]
Stock-based compensation (in shares)	10,627				27,489
Common Stock [Member] | Unit Purchase Options [Member]
Stock-based compensation (in shares)			121,173
Warrant [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights					$ 11.50

Cumulative Redeemable Convert44

Cumulative Redeemable Convertible Preferred Stock (Details Textual) - USD ($) $ in Millions	Jan. 12, 2018	Jul. 14, 2017	Jul. 20, 2016
Convertible Preferred Stock, Terms of Conversion			Each share of Preferred Stock was convertible (at the holders election) into two shares of the Companys common stock (as may be adjusted for any stock splits, reverse stock splits or similar transactions), representing a conversion price of $12.50 per share;
Redeemable Preferred Stock Decsription		the Company repurchased from 1347 Investors a total of 120,000 shares of the Preferred Stock for an aggregate sum of $4.1 million in cash, (b) for a period of six months after such repurchase, the Company had the right to repurchase from 1347 Investors, in one or more transactions, all or a portion of the remaining 280,000 shares of Preferred Stock owned by 1347 Investors for a purchase price equal to 130% of the liquidation value per share plus 130% of any and all accrued but unpaid dividends thereon as of the date of closing of the purchase of such shares and (c) 1347 Investors would not, with respect to the 509,500 shares of common stock held in escrow pursuant to its current lock-up arrangement that expired on July 20, 2017, sell or otherwise transfer such shares of common stock during the period from such expiration through October 20, 2017.
Stock Repurchased During Period, Shares		120,000
Payments for Repurchase of Preferred Stock and Preference Stock		$ 4.1
Common Stock Shares Held In Escrow Shares		509,500
Debt Instrument, Repurchased Face Amount	$ 10
Dividends Payable	0.9
Debt Instrument, Unamortized Premium	$ 2.2
Preferred Stock [Member]
Stock Repurchased During Period, Shares	280,000
Redeemable Convertible Preferred Stock [Member]
Preferred Stock, Dividend Payment Terms			preferential dividends at a rate of: (i) 8% per annum in years one through three from issuance; (ii) 10% per annum in years four through five from issuance; and (iii) 12% per annum thereafter, payable in equal quarterly installments.
Series A Preferred Stock [Member]
Stock Issued During Period, Shares, Acquisitions			400,000

Fair Value Measurements (Detail

Fair Value Measurements (Details Textual) $ in Millions	Mar. 31, 2018USD ($)
Bridge Loan [Member]
Debt Instrument, Fair Value Disclosure	$ 9.8
Senior Credit Facility [Member]
Line of Credit Facility, Fair Value of Amount Outstanding	16.9
Revolving Credit Facility [Member]
Line of Credit Facility, Fair Value of Amount Outstanding	$ 12.1

Earnings per Share (Details)

Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
EPS numerator:
Net loss	$ (2,424)	$ (1,214)
Less: Premium paid on redemption of redeemable convertible preferred stock	2,219	0
Less: Dividends on cumulative redeemable convertible preferred stock	(113)	238
Net loss attributable to Limbach Holdings, Inc. common stockholders	$ (4,530)	$ (1,452)
EPS denominator:
Weighted average shares outstanding - basic	7,541,422	7,454,491
Weighted average shares outstanding - diluted	7,541,422	7,454,491
Basic EPS attributable to common stockholders:
Net loss attributable to Limbach Holdings, Inc. common stockholders	$ (0.60)	$ (0.19)
Diluted EPS attributable to common stockholders:
Net loss attributable to Limbach Holdings, Inc. common stockholders	$ (0.60)	$ (0.19)

Earnings per Share (Details 1)

Earnings per Share (Details 1) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	508,005	1,487,520
Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	387,437	680,607
Class A Preferred stock
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	68,444	800,000
Stock-based compensation
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	46,948	0
UPOs
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	5,176	6,913

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Deferred income tax benefit
U.S. Federal	$ (759)	$ (887)
State and local	(284)	(196)
Total deferred income tax benefit	(1,043)	(1,083)
Income tax benefit	$ (1,043)	$ (1,083)

Income Taxes (Details 1)

Income Taxes (Details 1)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Federal statutory income tax rate	21.00%	34.00%
State income taxes, net of federal tax effect	5.50%	4.60%
Nondeductible/nontaxable items	4.50%	4.10%
Tax credits	(0.90%)	0.00%
Effective tax rate	30.10%	42.70%

Operating Segments (Details)

Operating Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Total revenue	$ 120,549	$ 115,190
Total gross profit	13,287	13,769
Total selling, general and administrative expenses	15,666	14,567
Amortization of intangibles	335	1,008
Operating loss	(2,714)	(1,806)
Operating loss for reportable segments	(2,714)	(1,806)
Interest expense, net	769	454
(Gain) loss on sale of property and equipment	(16)	37
Total unallocated amounts	753	491
Total consolidated loss before income taxes	(3,467)	(2,297)
Depreciation and amortization	1,371	2,646
Construction [Member]
Total revenue	96,810	91,465
Total gross profit	9,271	8,949
Total selling, general and administrative expenses	7,866	7,281
Depreciation and amortization	666	978
Service
Total revenue	23,739	23,725
Total gross profit	4,016	4,820
Total selling, general and administrative expenses	4,019	3,451
Depreciation and amortization	180	489
Corporate [Member]
Operating loss	3,781	3,835
Operating loss for reportable segments	3,781	3,835
Depreciation and amortization	$ 525	$ 1,179

Commitments and Contingencies (

Commitments and Contingencies (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating Leases, Rent Expense	$ 1	$ 0.9
Surety Bond [Member]
Long-term Debt	$ 86

Self-Insurance (Details)

Self-Insurance (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current liability — workers compensation and general liability	$ 392	$ 408
Current liability — medical and dental	506	508
Non-current liability	569	412
Total liability shown in Accrued expenses and other liabilities	1,467	1,328
Restricted cash	$ 113	$ 113

Self-Insurance (Details Textual

Self-Insurance (Details Textual) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)
Payment To Acquire Workers' Compensation And General Liability Insurance	$ 250
Malpractice Insurance, Annual Coverage Limit	$ 2,800

Backlog (Details Textual)

Backlog (Details Textual) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Construction [Member]
Estimated Revenue From Uncompleted Contract	$ 413.9
Construction [Member] | Predecessor [Member]
Estimated Revenue From Uncompleted Contract		$ 426.7
Service [Member]
Estimated Revenue From Uncompleted Contract	$ 38.6
Service [Member] | Predecessor [Member]
Estimated Revenue From Uncompleted Contract		$ 34.7

Management Incentive Plans (Det

Management Incentive Plans (Details)	3 Months Ended
	Mar. 31, 2018$ / sharesshares
Service Based Restricted Stock Units [Member]
Unvested, Awards | shares	176,965
Granted, Awards | shares	0
Vested, Awards | shares	(26,422)
Forfeited, Awards | shares	(2,667)
Unvested, Awards | shares	147,876
Unvested, Weighted-Average Grant Date Fair Values | $ / shares	$ 13.25
Granted, Weighted-Average Grant Date Fair Values | $ / shares	0
Vested, Weighted-Average Grant Date Fair Values | $ / shares	13.25
Forfeited, Weighted-Average Grant Date Fair Values | $ / shares	13.25
Unvested, Weighted-Average Grant Date Fair Values | $ / shares	$ 13.25
Performance Based Restricted Stock Units [Member]
Unvested, Awards | shares	66,500
Granted, Awards | shares	0
Vested, Awards | shares	0
Forfeited, Awards | shares	(2,000)
Unvested, Awards | shares	64,500
Unvested, Weighted-Average Grant Date Fair Values | $ / shares	$ 13.25
Granted, Weighted-Average Grant Date Fair Values | $ / shares	0
Vested, Weighted-Average Grant Date Fair Values | $ / shares	0
Forfeited, Weighted-Average Grant Date Fair Values | $ / shares	13.25
Unvested, Weighted-Average Grant Date Fair Values | $ / shares	$ 13.25
Market Based Awards [Member]
Unvested, Awards | shares	146,500
Granted, Awards | shares	0
Vested, Awards | shares	0
Forfeited, Awards | shares	(2,000)
Unvested, Awards | shares	144,500
Unvested, Weighted-Average Grant Date Fair Values | $ / shares	$ 6.58
Granted, Weighted-Average Grant Date Fair Values | $ / shares	0
Vested, Weighted-Average Grant Date Fair Values | $ / shares	0
Forfeited, Weighted-Average Grant Date Fair Values | $ / shares	6.58
Unvested, Weighted-Average Grant Date Fair Values | $ / shares	$ 6.58

Management Incentive Plans (D56

Management Incentive Plans (Details Textual) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Share-based Compensation	$ 467	$ 0
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	1 year 7 months 2 days
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options	$ 1,800
Restricted Stock Units (RSUs) [Member]
Share-based Compensation	$ 500
Performance Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	0
Service Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	0
Market Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	0
Omnibus Incentive Plan 2016 [Member]
Common Stock, Capital Shares Reserved for Future Issuance	800,000
Omnibus Incentive Plan 2016 [Member] | Performance Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			66,500
Earnings Per Share Growth Rate			60.00%
Omnibus Incentive Plan 2016 [Member] | Service Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			226,867
Omnibus Incentive Plan 2016 [Member] | Market Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			146,500

Subsequent Events (Details Text

Subsequent Events (Details Textual)	1 Months Ended
	Apr. 30, 2018shares	Jun. 30, 2018	Mar. 31, 2018
Subsequent Event [Line Items]
Minimum Fixed charge coverage ratio			1.25
Subsequent Event [Member]
Subsequent Event [Line Items]
Minimum Fixed charge coverage ratio		1.15
Subsequent Event [Member] | Service based RSU [Member] | Executive Officer [Member]
Subsequent Event [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	60,000
Subsequent Event [Member] | Performance based RSU [Member] | Executive Officer [Member]
Subsequent Event [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	60,000
Subsequent Event [Member] | Performance based RSU [Member] | Director [Member]
Subsequent Event [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	17,067