CompX International (CIX) 10-K 28 Feb 18 2017 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Feb. 22, 2018	Jun. 30, 2017
Document And Entity Information [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
Trading Symbol	CIX
Entity Registrant Name	COMPX INTERNATIONAL INC
Entity Central Index Key	1,049,606
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		2,426,107
Entity Public Float			$ 25.2

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 29,655	$ 33,153
Accounts receivable, net	10,446	10,347
Inventories	15,382	14,974
Prepaid expenses and other	879	701
Total current assets	56,362	59,175
Other assets:
Note receivable from affiliate	38,200	27,400
Goodwill	23,742	23,742
Other noncurrent	590	590
Total other assets	62,532	51,732
Property and equipment:
Land	4,935	4,935
Buildings	22,774	22,541
Equipment	67,373	65,570
Construction in progress	569	1,098
Gross property and equipment	95,651	94,144
Less accumulated depreciation	63,586	61,071
Net property and equipment	32,065	33,073
Total assets	150,959	143,980
Current liabilities:
Accounts payable and accrued liabilities	10,792	11,882
Income taxes payable to affiliate	470	1,441
Total current liabilities	11,262	13,323
Noncurrent liabilities -
Deferred income taxes	3,112	4,887
Stockholders' equity:
Preferred stock, $.01 par value; 1,000 shares authorized, none issued
Additional paid-in capital	55,612	55,515
Retained earnings	80,849	70,131
Total stockholders' equity	136,585	125,770
Total liabilities and stockholders’ equity	150,959	143,980
Commitments and contingencies (Note 10)
Class A Common Stock
Stockholders' equity:
Common stock	24	24
Total stockholders' equity	24	24
Class B Common Stock
Stockholders' equity:
Common stock	100	100
Total stockholders' equity	$ 100	$ 100

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Dec. 31, 2017	Dec. 31, 2016
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	1,000	1,000
Preferred stock, shares issued	0	0
Class A Common Stock
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares issued	2,426,107	2,419,107
Common stock, shares outstanding	2,426,107	2,419,107
Class B Common Stock
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	10,000,000	10,000,000
Common stock, shares issued	10,000,000	10,000,000
Common stock, shares outstanding	10,000,000	10,000,000

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Net sales	$ 112,035	$ 108,920	$ 108,994
Cost of goods sold	77,210	73,753	75,593
Gross profit	34,825	35,167	33,401
Selling, general and administrative expense	19,590	19,593	19,430
Operating income	15,235	15,574	13,971
Interest income	1,929	390	50
Income before income taxes	17,164	15,964	14,021
Provision for income taxes	3,961	5,507	4,903
Net income	$ 13,203	$ 10,457	$ 9,118
Basic and diluted earnings per common share	$ 1.06	$ 0.84	$ 0.73
Cash dividends per share	$ 0.20	$ 0.20	$ 0.20
Basic and diluted weighted average shares outstanding	12,423	12,416	12,408

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net income	$ 13,203	$ 10,457	$ 9,118
Depreciation and amortization	3,673	3,698	3,536
Deferred income taxes	(1,775)	(114)	125
Provision for inventory reserves	65	161	233
Other, net	116	169	125
Change in assets and liabilities:
Accounts receivable, net	(115)	(1,596)	(46)
Inventories, net	(473)	(37)	1,532
Accounts payable and accrued liabilities	(962)	153	(1,036)
Accounts with affiliates	(971)	970	37
Other, net	(178)	3	(148)
Net cash provided by operating activities	12,583	13,864	13,476
Cash flows from investing activities:
Capital expenditures	(2,796)	(3,175)	(4,218)
Note receivable from affiliate:
Collections	41,300	9,200
Advances	(52,100)	(36,600)
Net cash used in investing activities	(13,596)	(30,575)	(4,218)
Cash flows from financing activities -
Dividends paid	(2,485)	(2,483)	(2,481)
Net cash used in financing activities	(2,485)	(2,483)	(2,481)
Net increase (decrease)	(3,498)	(19,194)	6,777
Balance at beginning of year	33,153	52,347	45,570
Balance at end of year	29,655	33,153	52,347
Supplemental disclosures -
Cash paid for income taxes	$ 6,709	$ 4,646	$ 4,743

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Class A Common Stock	Class B Common Stock	Additional paid-in Capital	Retained Earnings
Balance at Dec. 31, 2014	$ 110,986	$ 24	$ 100	$ 55,342	$ 55,520
Net income	9,118				9,118
Cash dividends	(2,481)				(2,481)
Issuance of common stock	80			80
Balance at Dec. 31, 2015	117,703	24	100	55,422	62,157
Net income	10,457				10,457
Cash dividends	(2,483)				(2,483)
Issuance of common stock	93			93
Balance at Dec. 31, 2016	125,770	24	100	55,515	70,131
Net income	13,203				13,203
Cash dividends	(2,485)				(2,485)
Issuance of common stock	97			97
Balance at Dec. 31, 2017	$ 136,585	$ 24	$ 100	$ 55,612	$ 80,849

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Note 1 – Organization. We (NYSE MKT: CIX) are 87% owned by NL Industries, Inc. (NYSE: NL) at December 31, 2017. We manufacture and sell component products (security products and recreational marine components). At December 31, 2017, Valhi, Inc. (NYSE: VHI) owns 83% of NL’s outstanding common stock and a wholly-owned subsidiary of Contran Corporation owns 93% of Valhi’s outstanding common stock. All of Contran’s outstanding voting stock is held by a family trust established for the benefit of Lisa K. Simmons and Serena Simmons Connelly and their children, for which Ms. Simmons and Ms. Connelly are co-trustees, or is held directly by Ms. Simmons and Ms. Connelly or entities related to them. Consequently, Ms. Simmons and Ms. Connelly may be deemed to control Contran, Valhi, NL and us. Unless otherwise indicated, references in this report to “we,” “us,” or “our” refer to CompX International Inc. and its subsidiaries, taken as a whole. Management estimates. In preparing our financial statements in conformity with accounting principles generally accepted in the United States of America (“GAAP”) we are required to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at each balance sheet date and the reported amounts of our revenues and expenses during each reporting period. Actual results may differ significantly from previously estimated amounts under different assumptions or conditions. Principles of consolidation . Our consolidated financial statements include the accounts of CompX International Inc. and our wholly-owned subsidiaries. We eliminate all material intercompany accounts and balances. Fiscal year. Our fiscal year end is always the Sunday closest to December 31, and our operations are reported on a 52 or 53-week fiscal year. The year ended December 31, 2015 consisted of 53 weeks. Each of the years ended December 31, 2016 and 2017 consisted of 52 weeks. For presentation purposes, annual and quarterly information in the consolidated financial statements and accompanying notes are presented as ended on March 31, June 30, September 30 and December 31, as applicable. The actual date of our fiscal years ended December 31, 2015, 2016 and 2017 are January 3, 2016, January 1, 2017, and December 31, 2017, respectively. Cash and cash equivalents . We classify bank time deposits and government and commercial notes and bills with original maturities of three months or less as cash equivalents. Net sales . We record sales when products are shipped and title and other risks and rewards of ownership have passed to the customer, which is generally upon delivery of our products to transport carriers. Amounts charged to customers for shipping and handling are not material. Sales are stated net of price, early payment and distributor discounts and volume rebates (none of which are material). We report any tax assessed by a governmental authority that we collect from our customers that is both imposed on and concurrent with our revenue producing activities (such as sales and use taxes) on a net basis (meaning we do not recognize these taxes either in our revenues or in our costs and expenses). See Note 12. Accounts receivable. We provide an allowance for doubtful accounts for known and estimated potential losses arising from our sales to customers based on a periodic review of these accounts. Inventories and cost of sales . We state inventories at the lower of cost or net realizable value. We record a provision for obsolete and slow-moving inventories. We generally base inventory costs for all inventory categories on average cost that approximates the first-in, first-out method. Inventories include the costs for raw materials, the cost to manufacture the raw materials into finished goods and overhead. Depending on the inventory’s stage of completion, our manufacturing costs can include the costs of packing and finishing, utilities, maintenance and depreciation, shipping and handling, and salaries and benefits associated with our manufacturing process. We allocate fixed manufacturing overhead costs based on normal production capacity. Unallocated overhead costs resulting from periods with abnormally low production levels are charged to expense as incurred. As inventory is sold to third parties, we recognize the cost of sales in the same period that the sale occurs. We periodically review our inventory for estimated obsolescence or instances when inventory is no longer marketable for its intended use, and we record any write-down, equal to the difference between the cost of inventory and its estimated net realizable value, based on assumptions about alternative uses, market conditions and other factors. Selling, general and administrative expenses; advertising costs. Selling, general and administrative expenses include costs related to marketing, sales, distribution, research and development and administrative functions such as accounting, treasury and finance, and includes costs for salaries and benefits, travel and entertainment, promotional materials and professional fees. We expense advertising and research and development costs as incurred. Advertising costs were not significant in 2015, 2016 or 2017. Goodwill. Goodwill represents the excess of cost over fair value of individual net assets acquired in business combinations. Goodwill is not subject to periodic amortization. We evaluate goodwill for impairment annually or when circumstances indicate the carrying value may not be recoverable. See Note 5. Property and equipment; depreciation expense . We state property and equipment, including purchased computer software for internal use, at cost. We compute depreciation of property and equipment for financial reporting purposes principally by the straight-line method over the estimated useful lives of 15 to 40 years for buildings and 3 to 20 years for equipment and software. We use accelerated depreciation methods for income tax purposes, as permitted. Depreciation expense was $3.5 million in 2015 and $3.7 million in each of 2016 and 2017. Upon sale or retirement of an asset, the related cost and accumulated depreciation are removed from the accounts and any gain or loss is recognized in income currently. Expenditures for maintenance, repairs and minor renewals are expensed; expenditures for major improvements are capitalized. We perform impairment tests when events or changes in circumstances indicate the carrying value may not be recoverable. We consider all relevant factors. We perform the impairment test by comparing the estimated future undiscounted cash flows associated with the asset to the asset’s net carrying value to determine if impairment exists. Employee benefit plans. We maintain various defined contribution plans in which we make contributions based on matching or other formulas. Defined contribution plan expense approximated $2.4 million in 2015, $2.6 million in 2016 and $2.4 million in 2017. Self-insurance. We are partially self-insured for workers’ compensation and certain employee health benefits and self-insured for most environmental issues. We purchase coverage in order to limit our exposure to any significant levels of workers’ compensation or employee health benefit claims. We accrue self-insured losses based upon estimates of the aggregate liability for uninsured claims incurred using certain actuarial assumptions followed in the insurance industry and our own historical claims experience. Income taxes . We, and our parent NL, are members of the Contran Tax Group. We have been and currently are a part of the consolidated tax returns filed by Contran for U.S. federal purposes as well as for certain U.S. state jurisdictions. As a member of the Contran Tax Group, we are jointly and severally liable for the federal income tax liability of Contran and the other companies included in the Contran Tax Group for all periods in which we are included in the Contran Tax Group. See Note 10. As a member of the Contran Tax Group, we are a party to a tax sharing agreement which provides that we compute our provision for U.S. income taxes on a separate-company basis. Pursuant to the tax sharing agreement, we make payments to or receive payments from NL in amounts we would have paid to or received from the U.S. Internal Revenue Service or the applicable state tax authority had we not been a member of the Contran Tax Group. The separate company provisions and payments are computed using the tax elections made by Contran. We made net cash payments for income taxes to NL of $4.7 million in 2015, $4.6 million in 2016 and $6.7 million in 2017. Deferred income tax assets and liabilities are recognized for the expected future tax consequences of temporary differences between the income tax and financial reporting carrying amounts of assets and liabilities. Deferred income tax assets and liabilities for each tax-paying jurisdiction in which we operate are netted and presented as either a noncurrent deferred income tax asset or liability, as applicable. We periodically evaluate our deferred tax assets in the various taxing jurisdictions in which we operate and adjust any related valuation allowance based on the estimate of the amount of deferred tax assets which we believe do not meet the more-likely-than-not recognition criteria. See Notes 7 and 10. We record a reserve for uncertain tax positions for tax positions where we believe it is more-likely-than-not our position will not prevail with the applicable tax authorities. We did not have a reserve for uncertain tax positions in each of 2015, 2016 and 2017.

Business and Geographic Segment

Business and Geographic Segments	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Business and Geographic Segments	Note 2 – Our operating segments are defined as components of our operations about which separate financial information is available that is regularly evaluated by our chief operating decision maker in determining how to allocate resources and in assessing performance. At December 31, 2017, we had two reportable operating segments – Security Products and Marine Components. The Security Products segment, with a facility in South Carolina and a facility shared with Marine Components in Illinois, manufactures locking mechanisms and other security products for sale to the transportation, postal, office and institutional furniture, cabinetry, tool storage, healthcare and other industries. Our Marine Components segment, with a facility in Wisconsin and a facility shared with Security Products in Illinois, manufactures and distributes stainless steel exhaust systems, gauges and throttle controls primarily for recreational boats. The chief operating decision maker evaluates segment performance based on segment operating income, which is defined as income before income taxes, exclusive of certain general corporate income and expense items (primarily interest income) and certain non-recurring items (such as gains or losses on the disposition of long-lived assets outside the ordinary course of business). The accounting policies of the reportable operating segments are the same as those described in Note 1. Capital expenditures include additions to property and equipment, but exclude amounts attributable to business combinations. Segment assets are comprised of all assets attributable to the reportable segments. Corporate assets are not attributable to the operating segments and consist primarily of cash, cash equivalents and note receivable from affiliate. For geographic information, the point of origin (place of manufacture) for all net sales is the U.S., the point of destination for net sales is based on the location of the customer, and property and equipment are attributable to their physical location. Intersegment sales are not material. Years ended December 31, 2015 2016 2017 (In thousands) Net sales: Security Products $ 95,614 $ 94,693 $ 96,600 Marine Components 13,380 14,227 15,435 Total $ 108,994 $ 108,920 $ 112,035 Operating income (loss): Security Products $ 18,585 $ 19,981 $ 19,182 Marine Components 1,433 1,707 1,342 Corporate (6,047 ) (6,114 ) (5,289 ) Total operating income 13,971 15,574 15,235 Interest income 50 390 1,929 Income before income taxes $ 14,021 $ 15,964 $ 17,164 Depreciation and amortization: Security Products $ 2,831 $ 3,025 $ 3,072 Marine Components 695 663 591 Corporate 10 10 10 Total $ 3,536 $ 3,698 $ 3,673 Capital expenditures: Security Products $ 3,805 $ 3,017 $ 2,389 Marine Components 408 153 405 Corporate 5 5 2 Total $ 4,218 $ 3,175 $ 2,796 Net sales point of destination: United States $ 103,737 $ 98,526 $ 103,646 Canada 2,352 7,515 5,353 Mexico 1,334 1,315 1,486 Other 1,571 1,564 1,550 Total $ 108,994 $ 108,920 $ 112,035 December 31, 2015 2016 2017 (In thousands) Total assets: Security Products $ 72,561 $ 73,345 $ 72,961 Marine Components 12,761 12,209 11,704 Corporate and eliminations 49,470 58,426 66,294 Total $ 134,792 $ 143,980 $ 150,959 Net property and equipment for 2015, 2016 and 2017 is entirely located in the United States.

Accounts Receivable, Net

Accounts Receivable, Net	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Accounts Receivable, Net	Note 3 – December 31, 2016 2017 (In thousands) Account receivable, net: Security Products $ 9,329 $ 9,341 Marine Components 1,088 1,175 Allowance for doubtful accounts (70 ) (70 ) Total accounts receivable, net $ 10,347 $ 10,446

Inventories

Inventories	12 Months Ended
	Dec. 31, 2017
Inventory Disclosure [Abstract]
Inventories	Note 4 – December 31, 2016 2017 (In thousands) Raw materials: Security Products $ 2,365 $ 2,156 Marine Components 378 574 Total raw materials 2,743 2,730 Work-in-process: Security Products 7,387 8,290 Marine Components 1,601 1,546 Total work-in-process 8,988 9,836 Finished goods: Security Products 2,440 2,079 Marine Components 803 737 Total finished goods 3,243 2,816 Total inventories $ 14,974 $ 15,382

Goodwill

Goodwill	12 Months Ended
	Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill	Note 5 – We assign goodwill based on reporting unit Goodwill In 2015, 2016 and 2017, our goodwill was tested for impairment only in the third quarter of each year in connection with our annual testing date. No impairment was indicated as part of such annual reviews of goodwill. As permitted by GAAP, during 2015 and 2017 we used the qualitative assessment of ASC 350-20-35 for our annual impairment test and determined it was not necessary to perform the quantitative goodwill impairment test. During 2016, we used the quantitative assessment of ASC 350-20-35 for our annual impairment test using discounted cash flows to determine the estimated fair value of our Security Products reporting unit. Such discounted cash flows are a Level 3 input as defined by ASC 820-10-35. Our gross goodwill at December 31, 2017 is $33.6 million. Prior to 2015, we recorded a $9.9 million goodwill impairment in our Marine Components segment resulting in a net consolidated carrying amount of $23.7 million. There have been no changes in the carrying amount of our goodwill during the past three years.

Accounts Payable and Accrued Li

Accounts Payable and Accrued Liabilities	12 Months Ended
	Dec. 31, 2017
Payables And Accruals [Abstract]
Accounts Payable and Accrued Liabilities	Note 6 – December 31, 2016 2017 (In thousands) Accounts payable: Security Products $ 2,271 $ 1,897 Marine Components 343 375 Accrued liabilities: Employee benefits 7,644 7,413 Customer tooling 346 290 Taxes other than on income 300 289 Insurance 233 117 Professional 219 4 Sales rebates 140 135 Other 386 272 Total $ 11,882 $ 10,792

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Note 7 – The provision for income taxes and the difference between such provision for income taxes and the amount that would be expected using the U.S. federal statutory income tax rate of 35% are presented below. All of our pre-tax income relates to operations in the United States. Years ended December 31, 2015 2016 2017 (In thousands) Provision for income taxes: Currently payable $ 4,778 $ 5,621 $ 5,736 Deferred income tax expense (benefit) 125 (114 ) (1,775 ) Total $ 4,903 $ 5,507 $ 3,961 Expected tax expense, at the U.S. federal statutory income tax rate of 35% $ 4,908 $ 5,588 $ 6,007 Changes in federal tax rate, net - - (1,861 ) State income taxes 387 388 235 Domestic production activities deduction (415 ) (495 ) (505 ) Other, net 23 26 85 Total $ 4,903 $ 5,507 $ 3,961 On December 22, 2017, H.R.1, formally known as the “Tax Cuts and Jobs Act” (“2017 Tax Act”) was enacted into law. This new tax legislation, among other changes, reduces the federal corporate income tax rate from 35% to 21% effective January 1, 2018. Following the enactment of the 2017 Tax Act, the Securities and Exchange Commission issued Staff Accounting Bulletin (SAB) 118 to provide guidance on the accounting and reporting impacts of the 2017 Tax Act. SAB 118 states that companies should account for changes related to the 2017 Tax Act in the period of enactment if all information is available and the accounting can be completed. In situations where companies do not have enough information to complete the accounting in the period of enactment, a company must either 1) record an estimated provisional amount if the impact of the change can be reasonably estimated; or 2) continue to apply the accounting guidance that was in effect immediately prior to the 2017 Tax Act if the impact of the change cannot be reasonably estimated. If estimated provisional amounts are recorded, SAB 118 provides a measurement period of no longer than one year during which companies should adjust those amounts as additional information becomes available. Under GAAP, we are required to revalue our net deferred tax liability associated with our net taxable temporary differences in the period in which the new tax legislation is enacted based on deferred tax balances as of the enactment date, to reflect the effect of the reduction in the corporate income tax rate. Our temporary differences as of December 31, 2017 are not materially different from our temporary differences as of the enactment date. Accordingly, revaluation of our temporary differences is based on our net deferred tax liability as of December 31, 2017. Such revaluation resulted in a non-cash deferred income tax benefit of approximately $1.9 million, recognized in continuing operations, reducing our net deferred tax liability. The new tax legislation also eliminated the domestic production activities deduction beginning in 2018 and allows for the expensing of certain capital expenditures for assets placed in service between September 28, 2017 and December 31, 2022. The amounts recorded as of December 31, 2017 as a result of the 2017 Tax Act represent estimates based on information currently available and, in accordance with the guidance in SAB 118, these amounts are provisional and subject to adjustment as we obtain additional information and complete our analysis in 2018. If the underlying guidance or tax laws change and such change impacts the income tax effects of the new legislation recognized at December 31, 2017, or we determine we have additional tax liabilities under other provisions of the 2017 Tax Act, we will recognize an adjustment in the reporting period within the measurement period, which period ends December 22, 2018, in which such adjustment is determined. The components of the net deferred tax liability are summarized below. December 31, 2016 2017 (In thousands) Tax effect of temporary differences related to: Inventories $ 507 $ 347 Property and equipment (4,468 ) (2,796 ) Accrued liabilities and other deductible differences 114 23 Accrued employee benefits 1,592 1,009 Goodwill (2,625 ) (1,691 ) Other taxable differences (7 ) (4 ) Total deferred tax liability $ (4,887 ) $ (3,112 ) We and Contran file income tax returns in U.S. federal and various state and local jurisdictions. Our income tax returns prior to 2014 are generally considered closed to examination by applicable tax authorities.

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2017
Equity [Abstract]
Stockholders' Equity	Note 8 – Shares of common stock Class A Class B Issued and Issued and Balance at December 31, 2014 2,404,107 10,000,000 Issued 7,000 - Balance at December 31, 2015 2,411,107 10,000,000 Issued 8,000 - Balance at December 31, 2016 2,419,107 10,000,000 Issued 7,000 - Balance at December 31, 2017 2,426,107 10,000,000 Class A and Class B common stock. The shares of Class A common stock and Class B common stock are identical in all respects, except for certain voting rights and certain conversion rights in respect of the shares of the Class B common stock. Holders of Class A common stock are entitled to one vote per share. NL, which holds all of the outstanding shares of Class B common stock, is entitled to one vote per share in all matters except for election of directors, for which NL is entitled to ten votes per share. Holders of all classes of common stock entitled to vote will vote together as a single class on all matters presented to the stockholders for their vote or approval, except as otherwise required by applicable law. Each share of Class A common stock and Class B common stock have an equal and ratable right to receive dividends to be paid from our assets when and if declared by the board of directors. In the event of the dissolution, liquidation or winding up of our operations, the holders of Class A common stock and Class B common stock will be entitled to share equally and ratably in the assets available for distribution after payments are made to our creditors and to the holders of any of our preferred stock that may be outstanding at the time. Shares of the Class A common stock have no conversion rights. Under certain conditions, shares of Class B common stock will convert, on a share-for-share basis, into shares of Class A common stock. Share repurchases and cancellations. Prior to 2015, our board of directors authorized various repurchases of shares of our Class A common stock in open market transactions, including block purchases, or in privately-negotiated transactions at unspecified prices and over an unspecified period of time. We may repurchase our common stock from time to time as market conditions permit. The stock repurchase program does not include specific price targets or timetables and may be suspended at any time. Depending on market conditions, we may terminate the program prior to its completion. We will generally use cash on hand to acquire the shares. Repurchased shares will be added to our treasury and cancelled. We made no treasury purchases during 2015, 2016 or 2017 and at December 31, 2017, approximately 678,000 shares were available for purchase under these authorizations. Incentive compensation plan. We have a share based incentive compensation plan pursuant to which an aggregate of up to 200,000 shares of our common stock can be awarded to non-employee members of our board of directors. All of the Class A common shares we issued in 2015, 2016 and 2017 were issued under this plan. At December 31, 2017, 166,000 shares were available for award under this plan. Dividends. We paid regular quarterly dividends of $.05 per share during 2015, 2016 and 2017. Declaration and payment of future dividends and the amount thereof, if any, is discretionary and dependent upon our results of operations, financial condition, cash requirements for our businesses, contractual requirements and restrictions and other factors deemed relevant by our board of directors.

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2017
Related Party Transactions [Abstract]
Related Party Transactions	Note 9 – We may be deemed to be controlled by Ms. Lisa Simmons and Ms. Serena Connelly. See Note 1. Corporations that may be deemed to be controlled by or affiliated with these individuals sometimes engage in (a) intercorporate transactions such as guarantees, management and expense sharing arrangements, shared fee arrangements, joint ventures, partnerships, loans, options, advances of funds on open account, and sales, leases and exchanges of assets, including securities issued by both related and unrelated parties and (b) common investment and acquisition strategies, business combinations, reorganizations, recapitalizations, securities repurchases, and purchases and sales (and other acquisitions and dispositions) of subsidiaries, divisions or other business units, which transactions have involved both related and unrelated parties and have included transactions that resulted in the acquisition by one related party of a publicly-held minority equity interest in another related party. We continuously consider, review and evaluate, and understand that Contran and related entities consider, review and evaluate such transactions. Depending upon the business, tax and other objectives then relevant, it is possible that we might be a party to one or more such transactions in the future. From time to time, we may have loans and advances outstanding between us and various related parties pursuant to term and demand notes. We generally enter into these loans and advances for cash management purposes. When we loan funds to related parties, we are generally able to earn a higher rate of return on the loan than we would earn if we invested the funds in other instruments. While certain of these loans may be of a lesser credit quality than cash equivalent instruments otherwise available to us, we believe we have evaluated the credit risks in the terms of the applicable loans. In this regard, in August 2016, we entered into an unsecured revolving demand promissory note with Valhi whereby we have agreed to loan Valhi up to $40 million. Our loan to Valhi, as amended, bears interest at prime plus 1.00%, payable quarterly, with all principal due on demand, but in any event no earlier than December 31, 2019. Loans made to Valhi at any time under the agreement is at our discretion. At December 31, 2016 and 2017, the outstanding principal balance receivable from Valhi under the promissory note was $27.4 million and $38.2 million, respectively. Interest income (including unused commitment fees) on our loan to Valhi was $0.2 million in 2016 and $1.8 million in 2017. Under the terms of an Intercorporate Service Agreement (“ISA”) with Contran, employees of Contran perform certain management, tax planning, financial, legal and administrative services for us on a fee basis. Such fees are based upon estimates of time devoted to our affairs by individual Contran employees and the compensation of such persons. Because of the large number of companies affiliated with Contran, we believe we benefit from cost savings and economies of scale gained by not having certain management, financial and administrative staffs duplicated at each entity, thus allowing certain individuals to provide services to multiple companies but only be compensated by one entity. Fees pursuant to these agreements aggregated $3.0 million in 2015, $3.1 million in 2016 and $2.8 million in 2017. Contran and certain of its subsidiaries and affiliates, including us, purchase certain of their insurance policies as a group, with the costs of the jointly-owned policies being apportioned among the participating companies. Tall Pines Insurance Company (“Tall Pines”) and EWI RE, Inc. (“EWI”), each subsidiaries of Valhi, provide for or broker certain insurance policies for Contran and certain of its subsidiaries and affiliates, including us. Tall Pines purchases reinsurance from third-party insurance carriers with an A.M. Best Company rating of generally at least A-(Excellent) for substantially all of the risks it underwrites. Consistent with insurance industry practices, Tall Pines and EWI receive commissions from the insurance and reinsurance underwriters and/or assess fees for the policies that they provide or broker. The aggregate premiums we paid to Tall Pines and EWI were approximately $1.6 million in 2015, $1.7 million in 2016 and $2.2 million in 2017. These amounts principally represent payments for insurance premiums, which include premiums or fees paid to Tall Pines or fees paid to EWI. These amounts also include payments to insurers or reinsurers through EWI for the reimbursement of claims within our applicable deductible or retention ranges that such insurers or reinsurers paid to third parties on our behalf, as well as amounts for claims and risk management services and various other third-party fees and expenses incurred by the program. We expect that these relationships with Tall Pines and EWI will continue in 2018. With respect to certain of such jointly-owned insurance policies, it is possible that unusually large losses incurred by one or more insureds during a given policy period could leave the other participating companies without adequate coverage under that policy for the balance of the policy period. As a result, and in the event that the available coverage under a particular policy would become exhausted by one or more claims, Contran and certain of its subsidiaries and affiliates, including us, have entered into a loss sharing agreement under which any uninsured loss arising because the available coverage had been exhausted by one or more claims will be shared ratably amongst those entities that had submitted claims under the relevant policy .

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2017
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 10 – Legal proceedings . We are involved, from time to time, in various environmental, contractual, product liability, patent (or intellectual property), employment and other claims and disputes incidental to our business. We currently believe the disposition of all claims and disputes, individually or in the aggregate, should not have a material long-term adverse effect on our consolidated financial condition, results of operations or liquidity. Environmental matters and litigation . Our operations are governed by various federal, state and local environmental laws and regulations. Our policy is to comply with environmental laws and regulations at all of our facilities and to continually strive to improve environmental performance in association with applicable industry initiatives. We believe that our operations are in substantial compliance with applicable requirements of environmental laws. From time to time, we may be subject to environmental regulatory enforcement under various statutes, resolution of which typically involves the establishment of compliance programs. Income taxes. From time to time, we undergo examinations of our income tax returns, and tax authorities have or may propose tax deficiencies. We believe that we have adequately provided accruals for additional income taxes and related interest expense which may ultimately result from such examinations and we believe that the ultimate disposition of all such examinations should not have a material adverse effect on our consolidated financial position, results of operations or liquidity. We are a party to a tax sharing agreement with Contran and NL providing for the allocation of tax liabilities and tax payments as described in Note 1. Under applicable law, we, as well as every other member of the Contran Tax Group, are each jointly and severally liable for the aggregate federal income tax liability of Contran and the other companies included in the Contran Tax Group for all periods in which we are included in the Contran Tax Group. NL has agreed, however, to indemnify us for any liability for income taxes of the Contran Tax Group in excess of our tax liability in accordance with the tax sharing agreement. Concentration of credit risk . Our products are sold primarily in North America to original equipment manufacturers. Our ten largest customers accounted for approximately 48% of sales in 2015, 46% in 2016, and 44% in 2017. One customer of the Security Products segment accounted for 13% of consolidated sales in 2015, 14% in 2016 and 16% in 2017. Another customer of the Security Products segment accounted for approximately 12% of consolidated sales in 2015 and 11% in 2016. Rent expense was approximately $0.1 million in 2015 and $0.2 million in each of 2016 and 2017. At December 31, 2017, future minimum rentals under non-cancellable operating leases having an initial or remaining term of more than one year were as follows: Years ending December 31, Amount (In thousands) 2018 $ 128 2019 127 2020 110 2021 53 2022 - 2023 and thereafter - Total $ 418

Financial Instruments

Financial Instruments	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Financial Instruments	Note 11 – The following table presents the financial instruments that are not carried at fair value but which require fair value disclosure: December 31, December 31, 2016 2017 Carrying Fair Carrying Fair amount value amount value Cash and cash equivalents $ 33,153 $ 33,153 $ 29,655 $ 29,655 Accounts receivable, net 10,347 10,347 10,446 10,446 Accounts payable 2,614 2,614 2,272 2,272 Due to their near-term maturities, the carrying amounts of accounts receivable and accounts payable are considered equivalent to fair value.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	12 Months Ended
	Dec. 31, 2017
New Accounting Pronouncements And Changes In Accounting Principles [Abstract]
Recent Accounting Pronouncements	Note 12 – Adopted In January 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2017-04, Intangibles Goodwill and Other (Topic 350) Simplifying the Test for Goodwill Impairment Pending Adoption In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842)

Quarterly Results of Operations

Quarterly Results of Operations (Unaudited)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Quarterly Results of Operations (Unaudited)	Note 13 – Quarter ended March 31 June 30 Sept. 30 Dec. 31 (In millions, except per share amounts) 2016: Net sales $ 27.1 $ 27.1 $ 28.4 $ 26.3 Gross profit 8.2 8.5 9.4 9.1 Operating income 3.4 3.7 4.5 4.0 Net income 2.2 2.4 3.0 2.9 Basic and diluted earnings per share $ .18 $ .20 $ .24 $ .23 2017: Net sales $ 29.9 $ 30.0 $ 27.0 $ 25.1 Gross profit 9.7 9.5 8.2 7.4 Operating income 4.5 4.6 3.4 2.7 Net income 3.2 3.3 2.5 4.3 Basic and diluted earnings per share $ .25 $ .27 $ .20 $ .34 The sum of the quarterly per share amounts may not equal the annual per share amounts due to relative changes in the weighted-average number of shares used in the per share computations.

Summary of Significant Accoun20

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Organization	Organization. We (NYSE MKT: CIX) are 87% owned by NL Industries, Inc. (NYSE: NL) at December 31, 2017. We manufacture and sell component products (security products and recreational marine components). At December 31, 2017, Valhi, Inc. (NYSE: VHI) owns 83% of NL’s outstanding common stock and a wholly-owned subsidiary of Contran Corporation owns 93% of Valhi’s outstanding common stock. All of Contran’s outstanding voting stock is held by a family trust established for the benefit of Lisa K. Simmons and Serena Simmons Connelly and their children, for which Ms. Simmons and Ms. Connelly are co-trustees, or is held directly by Ms. Simmons and Ms. Connelly or entities related to them. Consequently, Ms. Simmons and Ms. Connelly may be deemed to control Contran, Valhi, NL and us. Unless otherwise indicated, references in this report to “we,” “us,” or “our” refer to CompX International Inc. and its subsidiaries, taken as a whole.
Management Estimates	Management estimates. In preparing our financial statements in conformity with accounting principles generally accepted in the United States of America (“GAAP”) we are required to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at each balance sheet date and the reported amounts of our revenues and expenses during each reporting period. Actual results may differ significantly from previously estimated amounts under different assumptions or conditions.
Principles of Consolidation	Principles of consolidation . Our consolidated financial statements include the accounts of CompX International Inc. and our wholly-owned subsidiaries. We eliminate all material intercompany accounts and balances.
Fiscal Year	Fiscal year. Our fiscal year end is always the Sunday closest to December 31, and our operations are reported on a 52 or 53-week fiscal year. The year ended December 31, 2015 consisted of 53 weeks. Each of the years ended December 31, 2016 and 2017 consisted of 52 weeks. For presentation purposes, annual and quarterly information in the consolidated financial statements and accompanying notes are presented as ended on March 31, June 30, September 30 and December 31, as applicable. The actual date of our fiscal years ended December 31, 2015, 2016 and 2017 are January 3, 2016, January 1, 2017, and December 31, 2017, respectively.
Cash and Cash Equivalents	Cash and cash equivalents . We classify bank time deposits and government and commercial notes and bills with original maturities of three months or less as cash equivalents.
Net Sales	Net sales . We record sales when products are shipped and title and other risks and rewards of ownership have passed to the customer, which is generally upon delivery of our products to transport carriers. Amounts charged to customers for shipping and handling are not material. Sales are stated net of price, early payment and distributor discounts and volume rebates (none of which are material). We report any tax assessed by a governmental authority that we collect from our customers that is both imposed on and concurrent with our revenue producing activities (such as sales and use taxes) on a net basis (meaning we do not recognize these taxes either in our revenues or in our costs and expenses). See Note 12.
Accounts Receivable	Accounts receivable. We provide an allowance for doubtful accounts for known and estimated potential losses arising from our sales to customers based on a periodic review of these accounts.
Inventories and Cost of Sales	Inventories and cost of sales . We state inventories at the lower of cost or net realizable value. We record a provision for obsolete and slow-moving inventories. We generally base inventory costs for all inventory categories on average cost that approximates the first-in, first-out method. Inventories include the costs for raw materials, the cost to manufacture the raw materials into finished goods and overhead. Depending on the inventory’s stage of completion, our manufacturing costs can include the costs of packing and finishing, utilities, maintenance and depreciation, shipping and handling, and salaries and benefits associated with our manufacturing process. We allocate fixed manufacturing overhead costs based on normal production capacity. Unallocated overhead costs resulting from periods with abnormally low production levels are charged to expense as incurred. As inventory is sold to third parties, we recognize the cost of sales in the same period that the sale occurs. We periodically review our inventory for estimated obsolescence or instances when inventory is no longer marketable for its intended use, and we record any write-down, equal to the difference between the cost of inventory and its estimated net realizable value, based on assumptions about alternative uses, market conditions and other factors.
Selling, General and Administrative Expenses; Advertising Costs	Selling, general and administrative expenses; advertising costs. Selling, general and administrative expenses include costs related to marketing, sales, distribution, research and development and administrative functions such as accounting, treasury and finance, and includes costs for salaries and benefits, travel and entertainment, promotional materials and professional fees. We expense advertising and research and development costs as incurred. Advertising costs were not significant in 2015, 2016 or 2017.
Goodwill	Goodwill. Goodwill represents the excess of cost over fair value of individual net assets acquired in business combinations. Goodwill is not subject to periodic amortization. We evaluate goodwill for impairment annually or when circumstances indicate the carrying value may not be recoverable. See Note 5.
Property and Equipment; Depreciation Expense	Property and equipment; depreciation expense . We state property and equipment, including purchased computer software for internal use, at cost. We compute depreciation of property and equipment for financial reporting purposes principally by the straight-line method over the estimated useful lives of 15 to 40 years for buildings and 3 to 20 years for equipment and software. We use accelerated depreciation methods for income tax purposes, as permitted. Depreciation expense was $3.5 million in 2015 and $3.7 million in each of 2016 and 2017. Upon sale or retirement of an asset, the related cost and accumulated depreciation are removed from the accounts and any gain or loss is recognized in income currently. Expenditures for maintenance, repairs and minor renewals are expensed; expenditures for major improvements are capitalized. We perform impairment tests when events or changes in circumstances indicate the carrying value may not be recoverable. We consider all relevant factors. We perform the impairment test by comparing the estimated future undiscounted cash flows associated with the asset to the asset’s net carrying value to determine if impairment exists.
Employee Benefit Plans	Employee benefit plans. We maintain various defined contribution plans in which we make contributions based on matching or other formulas. Defined contribution plan expense approximated $ 2.4 million in 2015, $2.6 million in 2016 and $2.4 million in 2017.
Self-Insurance	Self-insurance. We are partially self-insured for workers’ compensation and certain employee health benefits and self-insured for most environmental issues. We purchase coverage in order to limit our exposure to any significant levels of workers’ compensation or employee health benefit claims. We accrue self-insured losses based upon estimates of the aggregate liability for uninsured claims incurred using certain actuarial assumptions followed in the insurance industry and our own historical claims experience.
Income Taxes	Income taxes . We, and our parent NL, are members of the Contran Tax Group. We have been and currently are a part of the consolidated tax returns filed by Contran for U.S. federal purposes as well as for certain U.S. state jurisdictions. As a member of the Contran Tax Group, we are jointly and severally liable for the federal income tax liability of Contran and the other companies included in the Contran Tax Group for all periods in which we are included in the Contran Tax Group. See Note 10. As a member of the Contran Tax Group, we are a party to a tax sharing agreement which provides that we compute our provision for U.S. income taxes on a separate-company basis. Pursuant to the tax sharing agreement, we make payments to or receive payments from NL in amounts we would have paid to or received from the U.S. Internal Revenue Service or the applicable state tax authority had we not been a member of the Contran Tax Group. The separate company provisions and payments are computed using the tax elections made by Contran. We made net cash payments for income taxes to NL of $4.7 million in 2015, $4.6 million in 2016 and $6.7 million in 2017. Deferred income tax assets and liabilities are recognized for the expected future tax consequences of temporary differences between the income tax and financial reporting carrying amounts of assets and liabilities. Deferred income tax assets and liabilities for each tax-paying jurisdiction in which we operate are netted and presented as either a noncurrent deferred income tax asset or liability, as applicable. We periodically evaluate our deferred tax assets in the various taxing jurisdictions in which we operate and adjust any related valuation allowance based on the estimate of the amount of deferred tax assets which we believe do not meet the more-likely-than-not recognition criteria. See Notes 7 and 10. We record a reserve for uncertain tax positions for tax positions where we believe it is more-likely-than-not our position will not prevail with the applicable tax authorities. We did not have a reserve for uncertain tax positions in each of 2015, 2016 and 2017.

Business and Geographic Segme21

Business and Geographic Segments (Tables)	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Schedule of Business Segment Information	Years ended December 31, 2015 2016 2017 (In thousands) Net sales: Security Products $ 95,614 $ 94,693 $ 96,600 Marine Components 13,380 14,227 15,435 Total $ 108,994 $ 108,920 $ 112,035 Operating income (loss): Security Products $ 18,585 $ 19,981 $ 19,182 Marine Components 1,433 1,707 1,342 Corporate (6,047 ) (6,114 ) (5,289 ) Total operating income 13,971 15,574 15,235 Interest income 50 390 1,929 Income before income taxes $ 14,021 $ 15,964 $ 17,164 Depreciation and amortization: Security Products $ 2,831 $ 3,025 $ 3,072 Marine Components 695 663 591 Corporate 10 10 10 Total $ 3,536 $ 3,698 $ 3,673 Capital expenditures: Security Products $ 3,805 $ 3,017 $ 2,389 Marine Components 408 153 405 Corporate 5 5 2 Total $ 4,218 $ 3,175 $ 2,796
Business Segment Information by Geographical Areas	Net sales point of destination: United States $ 103,737 $ 98,526 $ 103,646 Canada 2,352 7,515 5,353 Mexico 1,334 1,315 1,486 Other 1,571 1,564 1,550 Total $ 108,994 $ 108,920 $ 112,035 December 31, 2015 2016 2017 (In thousands) Total assets: Security Products $ 72,561 $ 73,345 $ 72,961 Marine Components 12,761 12,209 11,704 Corporate and eliminations 49,470 58,426 66,294 Total $ 134,792 $ 143,980 $ 150,959

Accounts Receivable, Net (Table

Accounts Receivable, Net (Tables)	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Schedule of Accounts Receivable, Net	December 31, 2016 2017 (In thousands) Account receivable, net: Security Products $ 9,329 $ 9,341 Marine Components 1,088 1,175 Allowance for doubtful accounts (70 ) (70 ) Total accounts receivable, net $ 10,347 $ 10,446

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2017
Inventory Disclosure [Abstract]
Inventories	December 31, 2016 2017 (In thousands) Raw materials: Security Products $ 2,365 $ 2,156 Marine Components 378 574 Total raw materials 2,743 2,730 Work-in-process: Security Products 7,387 8,290 Marine Components 1,601 1,546 Total work-in-process 8,988 9,836 Finished goods: Security Products 2,440 2,079 Marine Components 803 737 Total finished goods 3,243 2,816 Total inventories $ 14,974 $ 15,382

Accounts Payable and Accrued 24

Accounts Payable and Accrued Liabilities (Tables)	12 Months Ended
	Dec. 31, 2017
Payables And Accruals [Abstract]
Accounts Payable and Accrued Liabilities	December 31, 2016 2017 (In thousands) Accounts payable: Security Products $ 2,271 $ 1,897 Marine Components 343 375 Accrued liabilities: Employee benefits 7,644 7,413 Customer tooling 346 290 Taxes other than on income 300 289 Insurance 233 117 Professional 219 4 Sales rebates 140 135 Other 386 272 Total $ 11,882 $ 10,792

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Components of Pre-tax Income and Provision for Income Taxes	The provision for income taxes and the difference between such provision for income taxes and the amount that would be expected using the U.S. federal statutory income tax rate of 35% are presented below. All of our pre-tax income relates to operations in the United States. Years ended December 31, 2015 2016 2017 (In thousands) Provision for income taxes: Currently payable $ 4,778 $ 5,621 $ 5,736 Deferred income tax expense (benefit) 125 (114 ) (1,775 ) Total $ 4,903 $ 5,507 $ 3,961 Expected tax expense, at the U.S. federal statutory income tax rate of 35% $ 4,908 $ 5,588 $ 6,007 Changes in federal tax rate, net - - (1,861 ) State income taxes 387 388 235 Domestic production activities deduction (415 ) (495 ) (505 ) Other, net 23 26 85 Total $ 4,903 $ 5,507 $ 3,961
Components of Net Deferred Tax Liability	The components of the net deferred tax liability are summarized below. December 31, 2016 2017 (In thousands) Tax effect of temporary differences related to: Inventories $ 507 $ 347 Property and equipment (4,468 ) (2,796 ) Accrued liabilities and other deductible differences 114 23 Accrued employee benefits 1,592 1,009 Goodwill (2,625 ) (1,691 ) Other taxable differences (7 ) (4 ) Total deferred tax liability $ (4,887 ) $ (3,112 )

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2017
Equity [Abstract]
Summary of Stockholders' Equity	Shares of common stock Class A Class B Issued and Issued and Balance at December 31, 2014 2,404,107 10,000,000 Issued 7,000 - Balance at December 31, 2015 2,411,107 10,000,000 Issued 8,000 - Balance at December 31, 2016 2,419,107 10,000,000 Issued 7,000 - Balance at December 31, 2017 2,426,107 10,000,000

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2017
Commitments And Contingencies Disclosure [Abstract]
Schedule of Future Minimum Rentals under Non-Cancellable Operating Leases	Rent expense was approximately $0.1 million in 2015 and $0.2 million in each of 2016 and 2017. At December 31, 2017, future minimum rentals under non-cancellable operating leases having an initial or remaining term of more than one year were as follows: Years ending December 31, Amount (In thousands) 2018 $ 128 2019 127 2020 110 2021 53 2022 - 2023 and thereafter - Total $ 418

Financial Instruments (Tables)

Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Carrying Value and Estimated Fair Value of Financial Instruments	The following table presents the financial instruments that are not carried at fair value but which require fair value disclosure: December 31, December 31, 2016 2017 Carrying Fair Carrying Fair amount value amount value Cash and cash equivalents $ 33,153 $ 33,153 $ 29,655 $ 29,655 Accounts receivable, net 10,347 10,347 10,446 10,446 Accounts payable 2,614 2,614 2,272 2,272

Quarterly Results of Operatio29

Quarterly Results of Operations (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Quarterly Results of Operations	Quarter ended March 31 June 30 Sept. 30 Dec. 31 (In millions, except per share amounts) 2016: Net sales $ 27.1 $ 27.1 $ 28.4 $ 26.3 Gross profit 8.2 8.5 9.4 9.1 Operating income 3.4 3.7 4.5 4.0 Net income 2.2 2.4 3.0 2.9 Basic and diluted earnings per share $ .18 $ .20 $ .24 $ .23 2017: Net sales $ 29.9 $ 30.0 $ 27.0 $ 25.1 Gross profit 9.7 9.5 8.2 7.4 Operating income 4.5 4.6 3.4 2.7 Net income 3.2 3.3 2.5 4.3 Basic and diluted earnings per share $ .25 $ .27 $ .20 $ .34

Summary of Significant Accoun30

Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Significant Accounting Policies [Line Items]
Depreciation	$ 3.7	$ 3.7	$ 3.5
Defined Contribution Plan, Cost Recognized	2.4	2.6	2.4
Income tax payments to NL	$ 6.7	$ 4.6	$ 4.7
Minimum | Building
Schedule Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives	15 years
Minimum | Equipment and software
Schedule Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives	3 years
Maximum | Building
Schedule Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives	40 years
Maximum | Equipment and software
Schedule Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives	20 years
NL Industries | CompX International Inc
Schedule Of Significant Accounting Policies [Line Items]
Percentage of ownership held by parent company	87.00%
Valhi Inc | NL Industries
Schedule Of Significant Accounting Policies [Line Items]
Percentage of ownership held by parent company	83.00%
Contran Corporation | Valhi Inc
Schedule Of Significant Accounting Policies [Line Items]
Percentage of ownership held by parent company	93.00%

Business and Geographic Segme31

Business and Geographic Segments - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017Segment
Segment Reporting [Abstract]
Number of reportable operating segments	2

Business and Geographic Segme32

Business and Geographic Segments - Schedule of Business Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net sales:
Total net sales	$ 25,100	$ 27,000	$ 30,000	$ 29,900	$ 26,300	$ 28,400	$ 27,100	$ 27,100	$ 112,035	$ 108,920	$ 108,994
Operating income (loss):
Total operating income	$ 2,700	$ 3,400	$ 4,600	$ 4,500	$ 4,000	$ 4,500	$ 3,700	$ 3,400	15,235	15,574	13,971
Interest income									1,929	390	50
Income before income taxes									17,164	15,964	14,021
Depreciation and amortization									3,673	3,698	3,536
Total capital expenditure									2,796	3,175	4,218
Operating Segments | Security Products
Net sales:
Total net sales									96,600	94,693	95,614
Operating income (loss):
Total operating income									19,182	19,981	18,585
Depreciation and amortization									3,072	3,025	2,831
Total capital expenditure									2,389	3,017	3,805
Operating Segments | Marine Components
Net sales:
Total net sales									15,435	14,227	13,380
Operating income (loss):
Total operating income									1,342	1,707	1,433
Depreciation and amortization									591	663	695
Total capital expenditure									405	153	408
Corporate
Operating income (loss):
Total operating income									(5,289)	(6,114)	(6,047)
Depreciation and amortization									10	10	10
Total capital expenditure									$ 2	$ 5	$ 5

Business and Geographic Segme33

Business and Geographic Segments - Business Segment Information by Geographical Areas (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net sales:
Net sales	$ 25,100	$ 27,000	$ 30,000	$ 29,900	$ 26,300	$ 28,400	$ 27,100	$ 27,100	$ 112,035	$ 108,920	$ 108,994
Total assets	150,959				143,980				150,959	143,980	134,792
Operating Segments | Security Products
Net sales:
Net sales									96,600	94,693	95,614
Total assets	72,961				73,345				72,961	73,345	72,561
Operating Segments | Marine Components
Net sales:
Net sales									15,435	14,227	13,380
Total assets	11,704				12,209				11,704	12,209	12,761
Corporate and eliminations
Net sales:
Total assets	$ 66,294				$ 58,426				66,294	58,426	49,470
Point Of Destination | United States
Net sales:
Net sales									103,646	98,526	103,737
Point Of Destination | Canada
Net sales:
Net sales									5,353	7,515	2,352
Point Of Destination | Mexico
Net sales:
Net sales									1,486	1,315	1,334
Point Of Destination | Other
Net sales:
Net sales									$ 1,550	$ 1,564	$ 1,571

Accounts Receivable, Net - Sche

Accounts Receivable, Net - Schedule of Accounts Receivable, Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Accounts Notes And Loans Receivable [Line Items]
Allowance for doubtful accounts	$ (70)	$ (70)
Total accounts receivable, net	10,446	10,347
Security Products
Accounts Notes And Loans Receivable [Line Items]
Accounts receivable, gross	9,341	9,329
Marine Components
Accounts Notes And Loans Receivable [Line Items]
Accounts receivable, gross	$ 1,175	$ 1,088

Inventories - Inventories (Deta

Inventories - Inventories (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Inventory [Line Items]
Total raw materials	$ 2,730	$ 2,743
Total work-in-process	9,836	8,988
Total finished goods	2,816	3,243
Total inventories	15,382	14,974
Security Products
Inventory [Line Items]
Total raw materials	2,156	2,365
Total work-in-process	8,290	7,387
Total finished goods	2,079	2,440
Marine Components
Inventory [Line Items]
Total raw materials	574	378
Total work-in-process	1,546	1,601
Total finished goods	$ 737	$ 803

Goodwill - Additional Informati

Goodwill - Additional Information (Detail) - USD ($)	Sep. 30, 2008	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Line Items]
Goodwill impairment charge		$ 0	$ 0	$ 0
Goodwill, gross		33,600,000
Goodwill		$ 23,742,000	$ 23,742,000
Marine Components
Goodwill [Line Items]
Goodwill impairment charge	$ 9,900,000

Accounts Payable and Accrued 37

Accounts Payable and Accrued Liabilities - Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Accrued liabilities:
Employee benefits	$ 7,413	$ 7,644
Customer tooling	290	346
Taxes other than on income	289	300
Insurance	117	233
Professional	4	219
Sales rebates	135	140
Other	272	386
Total	10,792	11,882
Security Products
Accounts payable:
Accounts payable	1,897	2,271
Marine Components
Accounts payable:
Accounts payable	$ 375	$ 343

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Line Items]
U.S. federal statutory income tax rate		35.00%	35.00%	35.00%
Non-cash deferred income tax benefit		$ 1,861
Scenario Forecast
Income Taxes [Line Items]
U.S. federal statutory income tax rate	21.00%

Income Taxes - Components of Pr

Income Taxes - Components of Pre-tax Income and Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Provision for income taxes:
Currently payable	$ 5,736	$ 5,621	$ 4,778
Deferred income tax expense (benefit)	(1,775)	(114)	125
Provision for income taxes	3,961	5,507	4,903
Expected tax expense, at the U.S. federal statutory income tax rate of 35%	6,007	5,588	4,908
Changes in federal tax rate, net	(1,861)
State income taxes	235	388	387
Domestic production activities deduction	(505)	(495)	(415)
Other, net	85	26	23
Provision for income taxes	$ 3,961	$ 5,507	$ 4,903

Income Taxes - Components of 40

Income Taxes - Components of Pre-tax Income and Provision for Income Taxes (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
U.S. federal statutory income tax rate	35.00%	35.00%	35.00%

Income Taxes - Components of Ne

Income Taxes - Components of Net Deferred Tax Liability (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Inventories	$ 347	$ 507
Property and equipment	(2,796)	(4,468)
Accrued liabilities and other deductible differences	23	114
Accrued employee benefits	1,009	1,592
Goodwill	(1,691)	(2,625)
Other taxable differences	(4)	(7)
Total deferred tax liability	$ (3,112)	$ (4,887)

Stockholders' Equity - Summary

Stockholders' Equity - Summary of Stockholders' Equity (Detail) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Class A Common Stock
Class Of Stock [Line Items]
Common stock, shares outstanding, beginning balance	2,419,107	2,411,107	2,404,107
Issued	7,000	8,000	7,000
Common stock, shares outstanding, ending balance	2,426,107	2,419,107	2,411,107
Class B Common Stock
Class Of Stock [Line Items]
Common stock, shares outstanding, beginning balance	10,000,000	10,000,000	10,000,000
Common stock, shares outstanding, ending balance	10,000,000	10,000,000	10,000,000

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017Vote$ / sharesshares	Dec. 31, 2016$ / sharesshares	Dec. 31, 2015$ / sharesshares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Treasury stock purchases	0	0	0
Shares available for purchase	678,000
Common Stock Dividend declared by directors | $ / shares	$ 0.05	$ 0.05	$ 0.05
2013 Director Stock Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for award	166,000
Non-Employee | 2013 Director Stock Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock shares authorized to be issued under the plan	200,000
Class A Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, vote per share | Vote	1
Class B Common Stock | NL Industries
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, vote per share | Vote	1
Common stock, vote per share | Vote	10

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail) - USD ($)	Aug. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Related Party Transaction [Line Items]
Note receivable from affiliate		$ 38,200,000	$ 27,400,000
Contran Corporation | Intercorporate Services Agreements Fees
Related Party Transaction [Line Items]
Related party transaction expense		2,800,000	3,100,000	$ 3,000,000
Tall Pines Insurance Company And EWI RE Inc
Related Party Transaction [Line Items]
Related party transaction expense		2,200,000	1,700,000	$ 1,600,000
Unsecured Revolving Demand Promissory | Valhi Inc
Related Party Transaction [Line Items]
Maximum loan amount	$ 40,000,000
Interest rate on loans repayment	1.00%
Principal due on demand effective date	Dec. 31, 2019
Note receivable from affiliate		38,200,000	27,400,000
Interest income including unused commitment fees on our loan		$ 1,800,000	$ 200,000

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)Customer	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Concentration Risk [Line Items]
Number of customers accounted for sale | Customer	10
Rent expense | $	$ 0.2	$ 0.2	$ 0.1
Customer Concentration Risk | Consolidated Sales | Ten Largest Customers
Concentration Risk [Line Items]
Sales Revenue, percentage	44.00%	46.00%	48.00%
Customer Concentration Risk | Consolidated Sales | Customer One | Security Products
Concentration Risk [Line Items]
Sales Revenue, percentage	16.00%	14.00%	13.00%
Customer Concentration Risk | Consolidated Sales | Customer Two | Security Products
Concentration Risk [Line Items]
Sales Revenue, percentage		11.00%	12.00%

Commitments and Contingencies46

Commitments and Contingencies - Schedule of Future Minimum Rentals under Non-Cancellable Operating Leases (Detail) $ in Thousands	Dec. 31, 2017USD ($)
Operating Leases Future Minimum Payments Due [Abstract]
2,018	$ 128
2,019	127
2,020	110
2,021	53
Total	$ 418

Financial Instruments - Carryin

Financial Instruments - Carrying Value and Estimated Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 29,655	$ 33,153
Accounts receivable, net	10,446	10,347
Accounts payable	2,272	2,614
Fair Value
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and cash equivalents	29,655	33,153
Accounts receivable, net	10,446	10,347
Accounts payable	$ 2,272	$ 2,614

Recent Accounting Pronounceme48

Recent Accounting Pronouncements - Additional Information (Detail) $ in Thousands	Dec. 31, 2017USD ($)
New Accounting Pronouncements And Changes In Accounting Principles [Abstract]
Amount of future minimum payments under non-cancellable operating leases	$ 418

Quarterly Results of Operatio49

Quarterly Results of Operations (Unaudited) - Quarterly Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 25,100	$ 27,000	$ 30,000	$ 29,900	$ 26,300	$ 28,400	$ 27,100	$ 27,100	$ 112,035	$ 108,920	$ 108,994
Gross profit	7,400	8,200	9,500	9,700	9,100	9,400	8,500	8,200	34,825	35,167	33,401
Operating income	2,700	3,400	4,600	4,500	4,000	4,500	3,700	3,400	15,235	15,574	13,971
Net income	$ 4,300	$ 2,500	$ 3,300	$ 3,200	$ 2,900	$ 3,000	$ 2,400	$ 2,200	$ 13,203	$ 10,457	$ 9,118
Basic and diluted earnings per share	$ 0.34	$ 0.20	$ 0.27	$ 0.25	$ 0.23	$ 0.24	$ 0.20	$ 0.18	$ 1.06	$ 0.84	$ 0.73