Northwest Pipe (NWPX) 10-K 4 Mar 21 2020 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2020	Feb. 22, 2021	Jun. 30, 2020
Document Information [Line Items]
Entity Central Index Key	0001001385
Entity Registrant Name	Northwest Pipe Co.
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2020
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
Document Transition Report	false
Entity File Number	0-27140
Entity Incorporation, State or Country Code	OR
Entity Tax Identification Number	93-0557988
Entity Address, Address Line One	201 NE Park Plaza Drive, Suite 100
Entity Address, City or Town	Vancouver
Entity Address, State or Province	WA
Entity Address, Postal Zip Code	98684
City Area Code	360
Local Phone Number	397-6250
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	NWPX
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 240,361,182
Entity Common Stock, Shares Outstanding		9,814,398

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net sales	$ 285,907	$ 279,317	$ 172,149
Cost of sales	235,388	232,133	160,053
Gross profit	50,519	47,184	12,096
Selling, general, and administrative expense	24,954	18,495	16,663
Gain on sale of facilities	0	0	(2,960)
Restructuring expense	0	0	1,364
Operating income (loss)	25,565	28,689	(2,971)
Bargain purchase gain	0	0	20,080
Other income	953	4,383	267
Interest income	49	40	267
Interest expense	(933)	(472)	(583)
Income before income taxes	25,634	32,640	17,060
Income tax expense (benefit)	6,584	4,738	(3,252)
Net income	$ 19,050	$ 27,902	$ 20,312
Net income per common share
Basic (in dollars per share)	$ 1.95	$ 2.86	$ 2.09
Diluted (in dollars per share)	$ 1.93	$ 2.85	$ 2.09
Shares used in per share calculations:
Basic (in shares)	9,788	9,741	9,726
Diluted (in shares)	9,873	9,779	9,733

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net income	$ 19,050	$ 27,902	$ 20,312
Other comprehensive income (loss), net of tax:
Pension liability adjustment	(25)	16	(115)
Unrealized gain (loss) on cash flow hedges	(27)	(59)	24
Other comprehensive loss, net of tax	(52)	(43)	(91)
Comprehensive income	$ 18,998	$ 27,859	$ 20,221

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 37,927	$ 31,014
Trade and other receivables, less allowance for doubtful accounts of $767 and $801	42,680	38,026
Contract assets	76,985	91,186
Inventories	29,177	30,654
Prepaid expenses and other	5,194	4,159
Total current assets	191,963	195,039
Property and equipment, net	110,184	99,631
Operating Lease, Right-of-Use Asset	30,813	7,683
Goodwill	22,985	0
Intangible assets, net	10,518	1,231
Other assets	6,552	6,661
Total assets	373,015	310,245
Current liabilities:
Current portion of long-term debt	7,701	0
Accounts payable	12,993	15,493
Accrued liabilities	16,814	12,150
Contract liabilities	6,189	12,281
Current portion of operating lease liabilities	2,204	1,642
Total current liabilities	45,901	41,566
Long-term debt	5,888	0
Long-term lease liabilities, operating leases	27,911	6,247
Deferred income taxes	12,481	4,265
Other long-term liabilities	11,208	10,009
Total liabilities	103,389	62,087
Commitments and contingencies (Note 14)
Stockholders’ equity:
Preferred stock, $.01 par value, 10,000,000 shares authorized, none issued or outstanding	0	0
Common stock, $.01 par value, 15,000,000 shares authorized, 9,805,437 and 9,746,979 shares issued and outstanding	98	97
Additional paid-in-capital	123,013	120,544
Retained earnings	148,381	129,331
Accumulated other comprehensive loss	(1,866)	(1,814)
Total stockholders’ equity	269,626	248,158
Total liabilities and stockholders’ equity	$ 373,015	$ 310,245

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Allowance for doubtful accounts	$ 767	$ 801
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	15,000,000	15,000,000
Common stock, shares issued (in shares)	9,805,437	9,746,979
Common stock, shares outstanding (in shares)	9,805,437	9,746,979

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Cumulative Effect, Period of Adoption, Adjustment [Member]Common Stock [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]Additional Paid-in Capital [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]AOCI Attributable to Parent [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balances (in shares) at Dec. 31, 2017						9,619,755
Beginning balance (Accounting Standards Update 2014-09 [Member]) at Dec. 31, 2017	$ 0	$ 0	$ (875)	$ 0	$ (875)
Beginning balance at Dec. 31, 2017						$ 96	$ 119,856	$ 81,757	$ (1,445)	$ 200,264
Net income						0	0	20,312	0	20,312
Pension liability adjustment						0	0	0	(115)	(115)
Unrealized gain (loss) on cash flow hedges, net of tax expense/benefit						$ 0	0	0	24	24
Issuance of common stock under stock compensation plans (in shares)						115,300
Issuance of common stock under stock compensation plans						$ 1	(1,302)	0	0	(1,301)
Share-based compensation expense						$ 0	281	0	0	281
Balances (in shares) at Dec. 31, 2018						9,735,055
Ending balance (Accounting Standards Update 2018-02 [Member]) at Dec. 31, 2018	$ 0	$ 0	$ 235	$ (235)	$ 0
Ending balance at Dec. 31, 2018						$ 97	118,835	101,194	(1,536)	218,590
Net income						0	0	27,902	0	27,902
Pension liability adjustment						0	0	0	16	16
Unrealized gain (loss) on cash flow hedges, net of tax expense/benefit						$ 0	0	0	(59)	(59)
Issuance of common stock under stock compensation plans (in shares)						11,924
Issuance of common stock under stock compensation plans						$ 0	0	0	0	0
Share-based compensation expense						$ 0	1,709	0	0	1,709
Balances (in shares) at Dec. 31, 2019						9,746,979
Ending balance at Dec. 31, 2019						$ 97	120,544	129,331	(1,814)	248,158
Net income						0	0	19,050	0	19,050
Pension liability adjustment						0	0	0	(25)	(25)
Unrealized gain (loss) on cash flow hedges, net of tax expense/benefit						$ 0	0	0	(27)	(27)
Issuance of common stock under stock compensation plans (in shares)						58,458
Issuance of common stock under stock compensation plans						$ 1	(619)	0	0	(618)
Share-based compensation expense						$ 0	3,088	0	0	3,088
Balances (in shares) at Dec. 31, 2020						9,805,437
Ending balance at Dec. 31, 2020						$ 98	$ 123,013	$ 148,381	$ (1,866)	$ 269,626

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net income	$ 19,050	$ 27,902	$ 20,312
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Bargain purchase gain	0	0	(20,080)
Depreciation and finance lease amortization	12,344	12,391	8,767
Gain on sale of facilities	0	0	(2,960)
Amortization of intangible assets	2,207	322	550
Deferred income taxes	2,908	4,169	(3,847)
Gain on insurance proceeds	(1,147)	(1,641)	0
Share-based compensation expense	3,088	1,709	281
Other, net	1,889	856	665
Trade and other receivables	1,563	(3,435)	2,220
Contract assets, net	8,109	(8,379)	(17,809)
Inventories	7,153	8,649	(13,628)
Prepaid expenses and other assets	2,514	2,454	2,910
Accounts payable	(3,501)	(4,675)	6,592
Accrued and other liabilities	(90)	2,564	(2,373)
Net cash provided by (used in) operating activities	56,087	42,886	(18,400)
Cash flows from investing activities:
Acquisition of business, net of cash acquired	(48,728)	0	(37,223)
Purchases of property and equipment	(14,013)	(8,585)	(3,797)
Purchases of intangible assets	(329)	0	0
Proceeds from sale of facilities	0	0	8,515
Proceeds from sale of property and equipment	0	39	141
Proceeds from insurance	1,637	2,123	0
Net cash used in investing activities from continuing operations	(61,433)	(6,423)	(32,364)
Net cash provided by investing activities from discontinued operations	0	0	4,465
Net cash used in investing activities	(61,433)	(6,423)	(27,899)
Cash flows from financing activities:
Borrowings on line of credit	41,377	41,744	29,904
Repayments on line of credit	(41,377)	(53,208)	(18,440)
Borrowings on long-term debt	15,879	0	0
Payments on long-term debt	(2,117)	0	0
Payments on finance lease liabilities	(420)	(434)	(398)
Payments of debt issuance costs	(465)	(228)	(435)
Tax withholdings related to net share settlements of restricted stock and performance share awards	(618)	0	(1,301)
Net cash provided by (used in) financing activities	12,259	(12,126)	9,330
Change in cash and cash equivalents	6,913	24,337	(36,969)
Cash and cash equivalents, beginning of period	31,014	6,677	43,646
Cash and cash equivalents, end of period	37,927	31,014	6,677
Supplemental disclosure of cash flow information:
Cash paid during the period for interest, net of amounts capitalized	599	369	330
Cash paid (received) during the period for income taxes (net of refunds of $153, $286 and $1)	1,397	(55)	170
Noncash investing and financing activities:
Accrued property and equipment purchases	325	719	336
Right-of-use assets obtained in exchange for operating lease liabilities	4,471	1,335	0
Right-of-use assets obtained in exchange for finance lease liabilities	$ 507	$ 819	$ 599

Note 1 - Organization

Note 1 - Organization	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	1. ORGANIZATION: Northwest Pipe Company (collectively with its subsidiaries, the “Company”) is a leading manufacturer for water related infrastructure products. In addition to being the largest manufacturer of engineered steel water pipeline systems in North America, the Company produces high-quality precast and reinforced concrete products, Permalok® steel casing pipe, bar-wrapped concrete cylinder pipe, as well as linings, coatings, joints, and one one Impact of the COVID- 19 Pandemic In March 2020, 2019 “COVID‑19” 19 19 Consistent with national guidelines and with state and local orders to date, the Company currently continues to operate its manufacturing facilities in the United States as it produces critical water infrastructure products. The Company has taken proactive and precautionary steps to ensure the safety of its employees, customers, and suppliers, including frequent cleaning and disinfection of workspaces, providing personal protective equipment, instituting social distancing measures, and offering remote working environments for certain employees. In early April 2020, not 19. June 2020, July 2020, While the COVID- 19 not December 31, 2020, 19 may may 19 may 19

Note 2 - Summary of Significant

Note 2 - Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Significant Accounting Policies [Text Block]	2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: Basis of Consolidation and Presentation The Consolidated Financial Statements are expressed in United States Dollars and include the accounts of the Company and its subsidiaries over which the Company exercises control as of the financial statement date. Intercompany accounts and transactions have been eliminated. Certain amounts from the prior year financial statements have been reclassified in order to conform to the current year presentation. Immaterial Correction of Error The Company recorded revenue of $1.2 million during the three twelve December 31, 2018, three March 31, 2019. not December 31, 2019 2018. Use of Estimates The preparation of the Consolidated Financial Statements in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”) requires management to make estimates and judgments that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances. On an ongoing basis, the Company evaluates all of its estimates, including those related to business combinations, allowance for doubtful accounts, inventories, property and equipment (including depreciation and valuation), goodwill, intangible assets, revenue recognition, share-based compensation, income taxes, and litigation and other contingencies. Actual results may Business Combinations Business combinations are accounted for under the acquisition method which requires identifiable assets acquired and liabilities assumed in the business acquired be recognized and measured at fair value on the acquisition date, which is the date that the acquirer obtains control of the acquired business. The amount by which the fair value of consideration transferred as the purchase price exceeds the net fair value of assets acquired and liabilities assumed is recorded as goodwill. The amount by which the net fair value of assets acquired and liabilities assumed exceeds the fair value of consideration transferred as the purchase price is recorded as a bargain purchase gain. Acquisition-related transaction costs are expensed as incurred. These estimates are inherently uncertain and unpredictable. In addition, unanticipated events and circumstances may may may one may Cash and Cash Equivalents Cash and cash equivalents consist of cash and short-term, highly-liquid investments with maturities of three Receivables and Allowance for Doubtful Accounts Trade receivables are reported on the Consolidated Balance Sheets net of doubtful accounts. The Company maintains allowances for estimated losses resulting from the inability of its customers to make required payments or from contract disputes. The amounts of such allowances are based on historical experience and management’s judgment. The Company will write down or write off a receivable account once the account is deemed uncollectible. If the customers’ financial conditions were to deteriorate resulting in their inability to make payments, or if contract disputes were to escalate, additional allowances may Contract Assets and Liabilities Contract assets primarily represent revenue earned over time but not 30 Inventories Inventories are stated at the lower of cost and net realizable value. The cost of raw material inventories of steel is either on a specific identification basis or on an average cost basis. The cost of all other raw material inventories, as well as work-in-process and supplies, is on an average cost basis. The cost of finished goods uses the first first Property and Equipment Property and equipment are recorded at cost. Maintenance and repairs are expensed as incurred, and costs of new equipment and buildings, as well as costs of expansions or refurbishment of existing equipment and buildings, including interest where applicable, are capitalized. Depreciation and amortization are determined by the units of production method for most equipment and by the straight-line method for the remaining assets based on the estimated useful lives of the related assets. Estimated useful lives by major classes of property and equipment are as follows: Land improvements (15 – 30 years); Buildings (20 – 40 years); and Machinery and equipment (3 – 30 years). Depreciation expense calculated under the units of production method may The Company assesses impairment of property and equipment whenever changes in circumstances indicate that the carrying values of the asset or asset group(s) may not Goodwill Goodwill represents the excess of purchase price over the assigned fair values of the assets and liabilities assumed in conjunction with an acquisition. Goodwill is reviewed for impairment annually as of December 31, may not 50% not not not Intangible Assets Intangible assets consist primarily of customer relationships and trade names and trademarks recorded as the result of acquisition activity. Intangible assets are amortized using the straight-line method over estimated useful lives ranging from 3 to 15 years. Workers Compensation The Company is self-insured, or maintains high deductible policies, for losses and liabilities associated with workers compensation claims. Losses are accrued based upon the Company’s estimates of the aggregate liability for claims incurred using historical experience and certain actuarial assumptions followed in the insurance industry. As of December 31, 2020 2019, Accrued Liabilities Accrued liabilities consist of the following (in thousands): December 31, 2020 2019 Accrued liabilities: Accrued bonus $ 3,747 $ 3,977 Accrued vacation payable 2,328 2,263 Foreign currency forward contracts 1,150 138 Finance lease liabilities 375 420 Workers compensation reserves 237 269 Other 8,977 5,083 Total accrued liabilities $ 16,814 $ 12,150 Derivative Instruments The Company conducts business in various foreign countries and, from time to time, settles transactions in foreign currencies. The Company has established a program that utilizes foreign currency forward contracts to offset the risk associated with the effects of certain foreign currency exposures, typically arising from sales contracts denominated in Canadian currency. Foreign currency forward contracts are consistent with the Company’s strategy for financial risk management. The Company utilizes cash flow hedge accounting treatment for qualifying foreign currency forward contracts. Instruments that do not Pension Benefits The Company has two 2001. Foreign Currency Transactions The functional currency of the Company, including its Mexican operations, is the United States dollar. Monetary assets and liabilities are remeasured at current exchange rates and non-monetary assets and liabilities are remeasured at historical exchange rates. Revenue and expenses related to monetary assets and liabilities are remeasured at average exchange rates and at historical exchange rates for the revenue and expenses related to non-monetary assets and liabilities. Transaction gains (losses) from foreign currency forward contracts designated as cash flow hedges are included in Accumulated other comprehensive loss as a separate component of Stockholders’ equity. For the years ended December 31, 2020, 2019, 2018, Revenue Recognition The Company manufactures water infrastructure steel pipe products, which are generally made to custom specifications for installation contractors serving projects funded by public water agencies, as well as precast and reinforced concrete products. Generally, each of the Company’s contracts with its customers contains a single performance obligation, as the promise to transfer products is not not Revenue for water infrastructure steel pipe products is recognized over time as the manufacturing process progresses because of the Company’s right to payment for work performed to date plus a reasonable profit on cancellations for unique products that have no may Revenue for water infrastructure concrete pipe and precast concrete products is recognized at the time control is transferred to customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for the products. All variable consideration that may not The Company does not Share-based Compensation The Company recognizes the compensation cost of employee and director services received in exchange for awards of equity instruments based on the grant date estimated fair value of the awards. The Company estimates the fair value of restricted stock units (“RSUs”) and performance share awards (“PSAs”) using the value of the Company’s stock on the date of grant. Share-based compensation cost is recognized over the period during which the employee or director is required to provide service in exchange for the award and, as forfeitures occur, the associated compensation cost recognized to date is reversed. For awards with performance-based payout conditions, the Company recognizes compensation cost based on the probability of achieving the performance conditions, with changes in expectations recognized as an adjustment to earnings in the period of change. Any recognized compensation cost is reversed if the conditions are ultimately not Income Taxes Income taxes are recorded using an asset and liability approach that requires the recognition of deferred income tax assets and liabilities for the expected future income tax consequences of events that have been recognized in the Company’s financial statements or income tax returns. Valuation allowances are established when necessary to reduce deferred income tax assets to the amount expected to be realized. The determination of the provision for income taxes requires significant judgment, the use of estimates, and the interpretation and application of complex tax laws. The provision for income taxes primarily reflects a combination of income earned and taxed in the various United States federal, state, local, and to a lesser extent, foreign jurisdictions. Jurisdictional tax law changes, increases or decreases in permanent differences between book and tax items, accruals or adjustments of accruals for unrecognized income tax benefits or valuation allowances, and the change in the mix of earnings from these taxing jurisdictions all affect the overall effective income tax rate. The Company records income tax reserves for federal, state, local, and international exposures relating to periods subject to audit. The development of reserves for these exposures requires judgments about tax issues, potential outcomes and timing, and is a subjective estimate. The Company assesses income tax positions and records income tax benefits for all years subject to examination based upon management’s evaluation of the facts, circumstances, and information available at the reporting dates. For those income tax positions where it is more-likely-than- not 50% not not no Accumulated Other Comprehensive Loss Accumulated other comprehensive loss includes unrealized gains and losses on derivative instruments related to the effective portion of cash flow hedges and changes in the funded status of the defined benefit pension plans, both net of the related income tax effect. Net Income per Share Basic net income per share is computed by dividing the net income by the weighted-average number of shares of common stock outstanding during the period. Diluted net income per share is computed by giving effect to all potential shares of common stock, including stock options, RSUs, and PSAs, to the extent dilutive. Performance-based PSAs are considered dilutive when the related performance conditions have been met assuming the end of the reporting period represents the end of the performance period. In periods with a net loss, all potential shares of common stock are excluded from the computation of diluted net loss per share as the impact would be antidilutive. Net income per basic and diluted weighted-average common share outstanding was calculated as follows (in thousands, except per share amounts): Year Ended December 31, 2020 2019 2018 Net income $ 19,050 $ 27,902 $ 20,312 Basic weighted-average common shares outstanding 9,788 9,741 9,726 Effect of potentially dilutive common shares (1) 85 38 7 Diluted weighted-average common shares outstanding 9,873 9,779 9,733 Net income per common share Basic $ 1.95 $ 2.86 $ 2.09 Diluted $ 1.93 $ 2.85 $ 2.09 ( 1 There were no antidilutive shares for the years ended December 31, 2020 2019. not December 31, 2018, not not December 31, 2018. Concentrations of Credit Risk Financial instruments, which potentially subject the Company to concentrations of credit risk, consist principally of trade receivables, foreign currency forward contracts, and deferred compensation plan assets. Trade receivables generally represent a large number of customers, including municipalities, manufacturers, distributors, and contractors, dispersed across a wide geographic base. As of December 31, 2020, one 10% 10% December 31, 2019. Recent Accounting and Reporting Developments Accounting Changes In August 2018, No. 2018 13, 820 2018 13” 2018 13 January 1, 2020 not Recent Accounting Standards In August 2018, No. 2018 14, 715 20 2018 14” 2018 14 January 1, 2021, not In December 2019, No. 2019 12, 740 2019 12” 740, 740” 2019 12 740 2019 12 January 1, 2021, not In March 2020, No. 2020 04, 848 March 12, 2020 December 31, 2022. January 2021, No. 2021 01, not

Note 3 - Business Combinations

Note 3 - Business Combinations	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Business Combination Disclosure [Text Block]	3. BUSINESS COMBINATION S : Geneva Pipe and Precast Company On January 31, 2020, three The following table summarizes the purchase consideration and fair value of the assets acquired and liabilities assumed as of January 31, 2020 Assets Cash and cash equivalents $ 691 Trade and other receivables 7,089 Inventories 5,673 Prepaid expenses and other 356 Property and equipment 9,096 Operating lease right-of-use assets 21,684 Intangible assets 11,165 Total assets acquired 55,754 Liabilities Accounts payable 1,395 Accrued liabilities 1,189 Operating lease liabilities 20,454 Deferred income taxes 5,343 Other long-term liabilities 939 Total liabilities assumed 29,320 Goodwill 22,985 Total purchase consideration $ 49,419 The purchase consideration for this business combination was allocated to the tangible and intangible assets acquired and liabilities assumed based on their estimated fair values on the acquisition date, with the remaining unallocated purchase consideration recorded as goodwill. As a result of additional information obtained during the measurement period about facts and circumstances that existed as of the acquisition date, the Company recorded measurement period adjustments during the three June 30, 2020 The following table summarizes the components of the intangible assets acquired and their estimated useful lives: Estimated Useful Life Fair Value (In years) (In thousands) Customer relationships 11.0 $ 8,031 Trade names 10.0 2,093 Backlog 0.9 1,041 Total intangible assets 9.9 $ 11,165 Goodwill arose from the acquisition of an assembled workforce, expansion of product offerings, and management’s industry know-how. The Company does not The Company incurred transaction costs associated with this acquisition of $2.6 million and $0.6 million during the years ended December 31, 2020 2019, Geneva operations contributed net sales of $44.2 million to the Company’s continuing operations for the period from January 31, 2020 December 31, 2020. The following unaudited pro forma summary presents the consolidated results of the Company as if the acquisition of Geneva had occurred on January 1 Year Ended December 31, 2020 2019 Net sales $ 289,496 $ 323,741 Net income 22,025 27,163 This unaudited pro forma consolidated financial data is included only for the purpose of illustration and does not January 1 not January 1 January 1 Ameron Water Transmission Group, LLC On July 27, 2018, December 2019, The following table summarizes the purchase consideration and fair value of the assets acquired and liabilities assumed as of July 27, 2018 Assets Cash and cash equivalents $ 912 Trade and other receivables 8,887 Contract assets 12,018 Inventories 7,937 Prepaid expenses and other 3,777 Property and equipment 34,827 Other assets 320 Total assets acquired 68,678 Liabilities Accounts payable 5,520 Accrued liabilities 1,599 Contract liabilities 123 Deferred income taxes 3,221 Total liabilities assumed 10,463 Bargain purchase gain (20,080 ) Total purchase consideration $ 38,135 As a result of additional information obtained during the measurement period about facts and circumstances that existed as of the acquisition date, the Company recorded measurement period adjustments during the three December 31, 2018 December 31, 2019. The purchase consideration for this business combination was allocated to the tangible and intangible assets acquired and liabilities assumed based on their estimated fair values on the acquisition date, with the excess of the aggregate net fair value of assets acquired and liabilities assumed over the fair value of consideration transferred as the purchase price recorded as a bargain purchase gain. When it became apparent there was a potential for a bargain purchase gain, management reviewed the Ameron assets acquired and liabilities assumed as well as the assumptions utilized in estimating their fair values. Upon completion of this reassessment, the Company concluded that recording a bargain purchase gain with respect to Ameron was appropriate and required under U.S. GAAP. The Company believes the seller was motivated to complete the transaction as part of an overall repositioning of its business. The Company incurred transaction costs associated with this acquisition of $2.6 million during the year ended December 31, 2018. The following unaudited pro forma summary presents the consolidated results of the Company as if the acquisition of Ameron had occurred on January 1 Year Ended December 31, 2018 Net sales $ 200,513 Net loss (15,102 ) This unaudited pro forma consolidated financial data is included only for the purpose of illustration and does not January 1 not January 1

Note 4 - Discontinued Operation

Note 4 - Discontinued Operations	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]	4. DISCONTINUED OPERATIONS: On December 26, 2017, February 2018 December 2018.

Note 5 - Inventories

Note 5 - Inventories	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Inventory Disclosure [Text Block]	5. INVENTORIES: Inventories consist of the following (in thousands): December 31, 2020 2019 Raw materials $ 20,631 $ 26,772 Work-in-process 1,416 1,579 Finished goods 5,489 683 Supplies 1,641 1,620 Total inventories $ 29,177 $ 30,654

Note 6 - Property and Equipment

Note 6 - Property and Equipment	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Property, Plant and Equipment Disclosure [Text Block]	6. PROPERTY AND EQUIPMENT: Property and equipment, net consists of the following (in thousands): December 31, 2020 2019 Land and improvements $ 22,773 $ 22,480 Buildings 47,663 44,251 Machinery and equipment 127,679 115,237 Equipment under finance lease 2,589 2,081 200,704 184,049 Less accumulated depreciation and amortization (96,684 ) (86,244 ) 104,020 97,805 Construction in progress 6,164 1,826 Property and equipment, net $ 110,184 $ 99,631 All property and equipment is located in the United States, except for $20.3 million and $19.8 million of net property and equipment which is located in Mexico as of December 31, 2020 2019, In December 2018, August 2018,

Note 7 - Goodwill and Intangibl

Note 7 - Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Goodwill and Intangible Assets Disclosure [Text Block]	7. GOODWILL AND INTANGIBLE ASSETS: Goodwill The changes in the carrying amount of goodwill for the year ended December 31, 2020 Goodwill, December 31, 2019 $ - Acquisition of Geneva (Note 3) 22,985 Goodwill, December 31, 2020 $ 22,985 The Company performed its annual goodwill impairment test as of December 31, 2020, not Intangible Assets Intangible assets consist of the following (in thousands): Gross Carrying Accumulated Intangible Amount Amortization Assets, Net As of December 31, 2020 Customer relationships $ 9,409 $ (1,634 ) $ 7,775 Trade names and trademarks 3,225 (720 ) 2,505 Other 329 (91 ) 238 Total $ 12,963 $ (2,445 ) $ 10,518 As of December 31, 2019 Customer relationships $ 1,378 $ (827 ) $ 551 Trade names and trademarks 1,132 (452 ) 680 Total $ 2,510 $ (1,279 ) $ 1,231 During the year ended December 31, 2020, 3, The estimated amortization expense for each of the next five Year ending December 31, 2021 $ 1,262 2022 1,262 2023 1,171 2024 1,015 2025 1,015 Thereafter 4,793 Total amortization expense $ 10,518

Note 8 - Line of Credit and Lon

Note 8 - Line of Credit and Long-term Debt	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Debt Disclosure [Text Block]	8. LINE OF CREDIT AND LONG-TERM DEBT : The Company’s Credit Agreement with Wells Fargo Bank, N.A. (“Wells Fargo”) dated October 25, 2018 January 31, 2020 No. 1 October 25, 2024. The Amended Credit Agreement contains customary representations and warranties, as well as customary affirmative and negative covenants, events of default, and indemnification provisions in favor of the lender. The negative covenants include restrictions regarding the incurrence of liens and indebtedness and certain acquisitions and dispositions of assets and other matters, all subject to certain exceptions. The Amended Credit Agreement also requires the Company to regularly provide financial information to Wells Fargo and to maintain a Senior Leverage Ratio (as defined in the Amended Credit Agreement) not 1.00. December 31, 2020. The Company's obligations under the Amended Credit Agreement are secured by a security interest in certain real property owned by the Company and its subsidiaries and substantially all of Company’s and its subsidiaries’ other assets. Interest expense from revolving loan borrowings, long-term debt, and finance leases was $0.9 million, net of amounts capitalized of $0.1 million in 2020, 2019, 2018. 2019 2018. Line of Credit (Revolving Loan) As of December 31, 2020, December 31, 2019, three December 31, 2020 2019, may Long-Term Debt Pursuant to the Amended Credit Agreement, on March 31, 2020, October 25, 2024 three December 31, 2020, 2020 2021 may ten Future principal payments of long-term debt, which excludes prepayments for periods beyond 2021 may Year ending December 31, 2021 $ 7,746 2022 3,176 2023 2,840 Total future principal payments 13,762 Less: Unamortized debt issuance costs (173 ) Less: Current portion of long-term debt (7,701 ) Long-term debt, net of current portion $ 5,888

Note 9 - Leases

Note 9 - Leases	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Lessee, Lease, Disclosure [Text Block]	9. LEASES: The Company adopted ASC Topic 842, 842” January 1, 2019 2019. not twelve 842, The Company has entered into various equipment and property leases. Certain lease agreements include renewals and/or purchase options set to expire at various dates, and certain lease agreements include rental payments adjusted periodically for inflation. The Company’s lease agreements do not The Company determines if an arrangement is a lease at inception. Leases with an initial term of twelve not not The following table summarizes the Company's leases recorded on the Consolidated Balance Sheets (in thousands): December 31, 2020 2019 Right-of-use assets: Finance leases, net, included in Property and equipment (1) $ 1,288 $ 1,203 Operating leases 30,813 7,683 Total right-of-use assets $ 32,101 $ 8,886 Lease liabilities: Finance leases $ 1,729 $ 1,641 Operating leases 30,115 7,889 Total lease liabilities $ 31,844 $ 9,530 ( 1 Finance lease right-of-use assets are presented net of accumulated amortization of $1.3 million and $0.9 million as of December 31, 2020 2019, Lease cost consists of the following (in thousands): Year Ended December 31, 2020 2019 Finance lease cost: Amortization of right-of-use assets $ 422 $ 435 Interest on lease liabilities 79 57 Operating lease cost 3,647 1,934 Short-term lease cost 745 1,442 Variable lease cost 199 141 Total lease cost $ 5,092 $ 4,009 As the Company has not 842, 840, December 31, 2018 The future maturities of lease liabilities as of December 31, 2020 Finance Leases Operating Leases 2021 $ 454 $ 3,178 2022 433 2,819 2023 230 2,561 2024 544 2,416 2025 301 2,358 Thereafter - 27,513 Total lease payments 1,962 40,845 Amount representing interest (233 ) (10,730 ) Present value of lease liabilities 1,729 30,115 Current portion of lease liabilities (1) (375 ) (2,204 ) Long-term lease liabilities (2) $ 1,354 $ 27,911 ( 1 Current portion of finance lease liabilities are included in Accrued liabilities. ( 2 Long-term finance lease liabilities, less current portion are included in Other long-term liabilities. The following table summarizes the lease terms and discount rates for the lease liabilities: December 31, 2020 2019 Weighted-average remaining lease term (years) Finance leases 3.67 3.79 Operating leases 18.21 8.31 Weighted-average discount rate Finance leases 5.22 % 5.40 % Operating leases 3.36 % 4.50 % The following table presents other information related to the operating and finance leases (in thousands): Year Ended December 31, 2020 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from finance leases $ (79 ) $ (57 ) Operating cash flows from operating leases (3,481 ) (1,909 ) Financing cash flows from finance leases (420 ) (434 ) Right-of-use assets obtained in exchange for finance lease liabilities 507 819 Right-of-use assets obtained in exchange for operating lease liabilities 4,471 1,335

Note 10 - Fair Value Measuremen

Note 10 - Fair Value Measurements	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Fair Value Disclosures [Text Block]	10. FAIR VALUE MEASUREMENTS: Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability, in the principal or most advantageous market for the asset or liability, in an orderly transaction between market participants at the measurement date. The authoritative guidance establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three 1 2 3 no The following table summarizes information regarding the Company’s financial assets and liabilities that are measured at fair value on a recurring basis (in thousands): Total Level 1 Level 2 Level 3 As of December 31, 2020 Financial assets: Deferred compensation plan $ 4,717 $ 3,884 $ 833 $ - Financial liabilities: Foreign currency forward contracts $ (1,150 ) $ - $ (1,150 ) $ - As of December 31, 2019 Financial assets: Deferred compensation plan $ 5,150 $ 4,268 $ 882 $ - Financial liabilities: Foreign currency forward contracts $ (138 ) $ - $ (138 ) $ - The deferred compensation plan assets consist of cash and several publicly traded stock and bond mutual funds, valued using quoted market prices in active markets, classified as Level 1 2 The Company’s foreign currency forward contracts are derivatives valued using various pricing models or discounted cash flow analyses that incorporate observable market parameters, such as interest rate yield curves and currency rates, and are classified as Level 2 The net carrying amounts of cash and cash equivalents, trade and other receivables, accounts payable, accrued liabilities, and revolving loan borrowings approximate fair value due to the short-term nature of these instruments. The Company is obligated to repay the carrying value of the Company’s long-term debt. The fair value of the Company’s long-term debt is calculated using interest rates for the Company’s existing debt arrangements which are classified as Level 2 December 31, 2020,

Note 11 - Derivative Instrument

Note 11 - Derivative Instruments and Hedging Activities	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Derivative Instruments and Hedging Activities Disclosure [Text Block]	11. DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES: For each foreign currency forward contract entered into in which the Company seeks to obtain cash flow hedge accounting treatment, the Company formally documents all relationships between hedging instruments and hedged items, as well as its risk management objective and strategy for undertaking the hedge transaction, the nature of the risk being hedged, how the hedging instrument’s effectiveness in offsetting the hedged risk will be assessed prospectively and retrospectively, and a description of the method of measuring ineffectiveness. This process includes linking all foreign currency forward contracts to specific firm commitments or forecasted transactions and designating the foreign currency forward contracts as cash flow hedges. The Company also formally assesses, both at the hedge’s inception and on an ongoing basis, whether the foreign currency forward contracts that are used in hedging transactions are highly effective in offsetting changes in cash flows of hedged items. The effective portion of these hedged items is reflected in Unrealized gain (loss) on cash flow hedges on the Consolidated Statements of Comprehensive Income. If it is determined that a foreign currency forward contract is not As of December 31, 2020 2019, CAD$19.5 CAD$7.9 December 31, 2020, May 2022 As of December 31, 2020 2019, December 31, 2020, 2019, 2018, not December 31, 2020, twelve 17,

Note 12 - Retirement Plans

Note 12 - Retirement Plans	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Retirement Benefits [Text Block]	12. RETIREMENT PLANS: Defined Contribution Plan The Company has a defined contribution retirement plan that covers substantially all of its employees and provides for a Company match of up to 50% of the first December 31, 2020, 2019, 2018, Defined Benefit Plans The Company has two 2001, No no As of December 31, 2020 2019, December 31, 2020 2019, The net periodic benefit cost for each of the years ended December 31, 2020, 2019, 2018 December 31, 2020 2019, The plan assets are invested in pooled separate accounts stated at fair value based on the daily net asset value of the account and are therefore not December 31, 2020 2019, Non-qualified Retirement Savings Plan The Company has a deferred compensation plan that covered officers and selected highly compensated employees until it was frozen in 2016. first first December 31, 2020 2019, Total expense for all retirement plans for the years ended December 31, 2020, 2019, 2018

Note 13 - Share-based Compensat

Note 13 - Share-based Compensation	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Share-based Payment Arrangement [Text Block]	13. SHARE-BASED COMPENSATION: The Company has one 2007 The following table summarizes share-based compensation expense recorded (in thousands): Year Ended December 31, 2020 2019 2018 Cost of sales $ 822 $ 383 $ 12 Selling, general, and administrative expense 2,266 1,326 269 Total $ 3,088 $ 1,709 $ 281 There were 354,022 shares of common stock available for future issuance under the Company’s stock incentive plan as of December 31, 2020, Stock Options Awards The Company’s stock incentive plan provides that options become exercisable according to vesting schedules, which range from immediate to ratably over a 60-month period. Options terminate ten December 31, 2020, 2019, 2018. December 31, 2020, December 31, 2020 December 31, 2019 2018. December 31, 2020, Restricted Stock Units and Performance Share Awards The Company’s stock incentive plan provides for equity instruments, such as RSUs and PSAs, which grant the right to receive a specified number of shares over a specified period of time. RSUs are service-based awards and vest according to vesting schedules, which range from immediate to ratably over a three The following table summarizes the Company’s RSU and PSA activity: Number of RSUs and PSAs (1) Weighted- Average Grant Date Fair Value Unvested RSUs and PSAs as of December 31, 2019 85,170 $ 23.56 RSUs and PSAs granted 97,834 26.61 Unvested RSUs and PSAs canceled (3,752 ) 23.56 RSUs and PSAs vested (2) (49,680 ) 23.56 Unvested RSUs and PSAs as of December 31, 2020 129,572 25.86 ( 1 The number of PSAs disclosed in this table are at the target level of 100%. ( 2 For the PSAs vested on March 31, 2020; The unvested balance of RSUs and PSAs as of December 31, 2020 The weighted-average grant date fair value of RSUs granted during the years ended December 31, 2020 2019 December 31, 2020, 2019, 2018 December 31, 2018. December 31, 2020, 2019, 2018 As of December 31, 2020, Stock Awards For the years ended December 31, 2020, 2019, 2018, 2020, 2019, 2018.

Note 14 - Commitments and Conti

Note 14 - Commitments and Contingencies	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	14 . COMMITMENTS AND CONTINGENCIES: Portland Harbor Superfund Site In December 2000, not December 2000, February 2016, June 2016, January 2017, not no The ODEQ is separately providing oversight of voluntary investigations and source control activities by the Company involving the Company's site, which are focused on controlling any current “uplands” releases of contaminants into the Willamette River. No not Concurrent with the activities of the EPA and the ODEQ, the Portland Harbor Natural Resources Trustee Council (“Trustees”) sent some or all of the same parties, including the Company, a notice of intent to perform a Natural Resource Damage Assessment (“NRDA”) for the Portland Harbor Superfund Site to determine the nature and extent of natural resource damages under CERCLA Section 107. three one June 2014, not may In January 2017, 2009, not The Company has insurance policies for defense costs, as well as indemnification policies it believes will provide reimbursement for the remediation assessed. However, the Company can provide no may All Sites The Company operates its facilities under numerous governmental permits and licenses relating to air emissions, stormwater runoff, and other environmental matters. The Company’s operations are also governed by many other laws and regulations, including those relating to workplace safety and worker health, principally the Occupational Safety and Health Act and regulations there under which, among other requirements, establish noise and dust standards. The Company believes it is in material compliance with its permits and licenses and these laws and regulations, and the Company does not Other Contingencies and Legal Proceedings From time to time, the Company is involved in litigation relating to claims arising out of its operations in the normal course of its business. The Company maintains insurance coverage against potential claims in amounts that are believed to be adequate. To the extent that insurance does not not On April 21, 2019, no October 2019. December 31, 2020 December 31, 2019, Guarantees The Company has entered into certain letters of credit that total $1.6 million as of December 31, 2020.

Note 15 - Revenue

Note 15 - Revenue	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Revenue from Contract with Customer [Text Block]	15 . REVENUE: The Company adopted ASC Topic 606, 606” January 1, 2018 not 606 January 1, 2018 January 1, 2018 not Net sales by geographic region, based on the location of the customer, were as follows (in thousands): Year Ended December 31, 2020 2019 2018 Net sales by geographic region: United States $ 254,956 $ 252,797 $ 161,415 Canada 30,951 26,520 10,734 Total $ 285,907 $ 279,317 $ 172,149 One customer accounted for 16% and 23% of total Net sales for the years ended December 31, 2020 2019, 10% December 31, 2018. Revisions in contract estimates resulted in an increase (decrease) in revenue of $2.2 million, $(1.2) million, and $(0.2) million for the years ended December 31, 2020, 2019, 2018, Disaggregation of Revenue The following table disaggregates revenue by recognition over time or at a point in time, as the Company believes it best depicts how the nature, amount, timing, and uncertainty of its revenue and cash flows are affected by economic factors (in thousands): Year Ended December 31, 2020 2019 2018 Over time $ 241,690 $ 279,317 $ 172,149 Point in time 44,217 - - Net sales $ 285,907 $ 279,317 $ 172,149 Contract Assets and Liabilities The difference between the opening and closing balances of the Company’s Contract assets and Contract liabilities primarily results from the timing difference between the Company’s performance and billings, and during the year ended December 31, 2018, December 31, 2020, 2019, 2018 not The Company recognized revenue that was included in the Contract liabilities balance at the beginning of each period of $12.3 million, $3.7 million, and $2.6 million during the years ended December 31, 2020, 2019, 2018, Backlog Backlog represents the balance of remaining performance obligations under signed contracts for water infrastructure steel pipe products for which revenue is recognized over time. As of December 31, 2020, 2021, 2022,

Note 16 - Income Taxes

Note 16 - Income Taxes	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Income Tax Disclosure [Text Block]	16 . INCOME TAXES: The United States and foreign components of Income before income taxes are as follows (in thousands): Year Ended December 31, 2020 2019 2018 United States $ 24,768 $ 32,244 $ 16,207 Foreign 866 396 853 Total $ 25,634 $ 32,640 $ 17,060 The components of Income tax expense (benefit) are as follows (in thousands): Year Ended December 31, 2020 2019 2018 Current: Federal $ 958 $ 174 $ (117 ) State 1,342 (16 ) 99 Foreign 243 439 395 Total current income tax expense 2,543 597 377 Deferred: Federal 4,380 3,597 (2,954 ) State (386 ) 561 (807 ) Foreign 47 (17 ) 132 Total deferred income tax expense (benefit) 4,041 4,141 (3,629 ) Total income tax expense (benefit) $ 6,584 $ 4,738 $ (3,252 ) The difference between the Company’s effective income tax rate and the federal statutory income tax rate is explained as follows (dollar amounts in thousands): Year Ended December 31, 2020 2019 2018 Income tax expense at federal statutory rate $ 5,383 $ 6,854 $ 3,583 State expense (benefit), net of federal income tax effect 953 1,261 (218 ) Federal and state income tax credits - - (7 ) Change in valuation allowance (181 ) (3,564 ) (2,618 ) Tax windfall on share-based compensation - - (369 ) Bargain purchase gain - - (4,228 ) Nondeductible expenses 447 (24 ) 427 Foreign rate differential 78 36 77 Other (96 ) 175 101 Income tax expense (benefit) $ 6,584 $ 4,738 $ (3,252 ) Effective income tax rate 25.7 % 14.5 % (19.1 )% The income tax effect of temporary differences that give rise to significant portions of deferred income tax assets and liabilities is presented below (in thousands): December 31, 2020 2019 Deferred income tax assets: Accrued employee benefits $ 3,525 $ 3,089 Inventories 73 147 Trade receivable, net 958 788 Net operating loss carryforwards 3,231 5,391 Tax credit carryforwards 2,699 5,173 Other 389 509 10,875 15,097 Valuation allowance (6,228 ) (6,126 ) 4,647 8,971 Deferred income tax liabilities: Contract assets, net (1,366 ) (1,703 ) Property and equipment (12,029 ) (10,578 ) Intangible assets (2,737 ) (226 ) Prepaid expenses (889 ) (587 ) (17,021 ) (13,094 ) Net deferred income tax liabilities $ (12,374 ) $ (4,123 ) Amounts are presented in the Consolidated Balance Sheets as follows: Deferred income tax assets, included in Other assets $ 107 $ 142 Deferred income taxes (12,481 ) (4,265 ) Net deferred income tax liabilities $ (12,374 ) $ (4,123 ) In assessing the ability to realize deferred income tax assets, management considers whether it is more likely than not not not not December 31, 2020, As of December 31, 2020, 2023 2034, 2024. December 31, 2020, 2021 2038, 2021. December 31, 2020, 2023 2030. The Company files income tax returns in the United States Federal jurisdiction, in a limited number of foreign jurisdictions, and in many state jurisdictions. With few exceptions, the Company is no 2016. A summary of the changes in the unrecognized income tax benefits is presented below (in thousands): Year Ended December 31, 2020 2019 2018 Unrecognized income tax benefits, beginning of year $ 4,350 $ 4,350 $ 4,116 Increases for positions taken in the current year - - 234 Unrecognized income tax benefits, end of year $ 4,350 $ 4,350 $ 4,350 The Company does not twelve The Company recognizes interest and penalties related to uncertain income tax positions in Income tax expense (benefit). As of December 31, 2020 2019, no not 2020, 2019, 2018. On December 22, 2017, 2017 not December 31, 2017, one December 31, 2017. No. 118 118” not December 22, 2018, 118, not 2017. January 1, 2019, No. 2018 02, 220 2018 02”

Note 17 - Accumulated Other Com

Note 17 - Accumulated Other Comprehensive Loss	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Comprehensive Income (Loss) Note [Text Block]	17. ACCUMULATED OTHER COMPREHENSIVE LOSS: Accumulated other comprehensive loss consists of the following (in thousands): December 31, 2020 2019 Pension liability adjustment, net of income tax benefit of $679 and $671 $ (1,795 ) $ (1,770 ) Unrealized loss on cash flow hedges, net of income tax benefit of $20 and $11 (71 ) (44 ) Total $ (1,866 ) $ (1,814 ) The following table summarizes changes in the components of Accumulated other comprehensive loss (in thousands). All amounts are net of income tax: Pension Liability Adjustment Unrealized Loss on Cash Flow Hedges Total Balance, December 31, 2019 $ (1,770 ) $ (44 ) $ (1,814 ) Other comprehensive loss before reclassifications (3 ) (308 ) (311 ) Amounts reclassified from Accumulated other comprehensive loss (22 ) 281 259 Net current period adjustments to Other comprehensive loss (25 ) (27 ) (52 ) Balance, December 31, 2020 $ (1,795 ) $ (71 ) $ (1,866 ) The following table provides additional detail about Accumulated other comprehensive loss components that were reclassified to the Consolidated Statements of Operations (in thousands): Amount reclassified from Accumulated Other Comprehensive Loss Affected line item in the Details about Accumulated Other Year Ended December 31, Consolidated Statements Comprehensive Loss Components 2020 2019 2018 of Operations Pension liability adjustment: Net periodic pension cost: Service cost $ (16 ) $ (11 ) $ (11 ) Cost of sales Non-service cost 46 (15 ) 52 Other income Associated income tax (expense) benefit (8 ) 4 8 Income tax expense (benefit) 22 (22 ) 49 Unrealized gain (loss) on cash flow hedges: Gain (loss) on cash flow hedges (378 ) 5 13 Net sales Associated income tax (expense) benefit 97 2 (1 ) Income tax expense (benefit) (281 ) 7 12 Total reclassifications for the period $ (259 ) $ (15 ) $ 61

Note 18 - Restructuring

Note 18 - Restructuring	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Restructuring and Related Activities Disclosure [Text Block]	18 . RESTRUCTURING: In March 2018, second 2018. March 2018, second 2018, December 2018. December 31, 2018,

Schedule II - Valuation and Qua

Schedule II - Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]	Schedule II NORTHWEST PIPE COMPANY (Dollars in thousands) Balance at Beginning of Period Charged to Profit and Loss Deduction from Reserves Balance at End of Period Year Ended December 31, 2020: Allowance for doubtful accounts $ 801 430 (464 ) $ 767 Valuation allowance for deferred income tax assets 6,126 240 (138 ) 6,228 Year Ended December 31, 2019: Allowance for doubtful accounts $ 660 $ 312 $ (171 ) $ 801 Valuation allowance for deferred income tax assets 9,433 345 (3,652 ) 6,126 Year Ended December 31, 2018: Allowance for doubtful accounts $ 477 $ 449 $ (266 ) $ 660 Valuation allowance for deferred income tax assets 10,413 1,785 (2,765 ) 9,433

Significant Accounting Policies

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Consolidation, Policy [Policy Text Block]	Basis of Consolidation and Presentation The Consolidated Financial Statements are expressed in United States Dollars and include the accounts of the Company and its subsidiaries over which the Company exercises control as of the financial statement date. Intercompany accounts and transactions have been eliminated. Certain amounts from the prior year financial statements have been reclassified in order to conform to the current year presentation.
Reclassification, Comparability Adjustment [Policy Text Block]	Immaterial Correction of Error The Company recorded revenue of $1.2 million during the three twelve December 31, 2018, three March 31, 2019. not December 31, 2019 2018.
Use of Estimates, Policy [Policy Text Block]	Use of Estimates The preparation of the Consolidated Financial Statements in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”) requires management to make estimates and judgments that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances. On an ongoing basis, the Company evaluates all of its estimates, including those related to business combinations, allowance for doubtful accounts, inventories, property and equipment (including depreciation and valuation), goodwill, intangible assets, revenue recognition, share-based compensation, income taxes, and litigation and other contingencies. Actual results may
Business Combinations Policy [Policy Text Block]	Business Combinations Business combinations are accounted for under the acquisition method which requires identifiable assets acquired and liabilities assumed in the business acquired be recognized and measured at fair value on the acquisition date, which is the date that the acquirer obtains control of the acquired business. The amount by which the fair value of consideration transferred as the purchase price exceeds the net fair value of assets acquired and liabilities assumed is recorded as goodwill. The amount by which the net fair value of assets acquired and liabilities assumed exceeds the fair value of consideration transferred as the purchase price is recorded as a bargain purchase gain. Acquisition-related transaction costs are expensed as incurred. These estimates are inherently uncertain and unpredictable. In addition, unanticipated events and circumstances may may may one may
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash and Cash Equivalents Cash and cash equivalents consist of cash and short-term, highly-liquid investments with maturities of three
Receivable [Policy Text Block]	Receivables and Allowance for Doubtful Accounts Trade receivables are reported on the Consolidated Balance Sheets net of doubtful accounts. The Company maintains allowances for estimated losses resulting from the inability of its customers to make required payments or from contract disputes. The amounts of such allowances are based on historical experience and management’s judgment. The Company will write down or write off a receivable account once the account is deemed uncollectible. If the customers’ financial conditions were to deteriorate resulting in their inability to make payments, or if contract disputes were to escalate, additional allowances may
Contract Assets and Liabilities, Policy [Policy Text Block]	Contract Assets and Liabilities Contract assets primarily represent revenue earned over time but not 30
Inventory, Policy [Policy Text Block]	Inventories Inventories are stated at the lower of cost and net realizable value. The cost of raw material inventories of steel is either on a specific identification basis or on an average cost basis. The cost of all other raw material inventories, as well as work-in-process and supplies, is on an average cost basis. The cost of finished goods uses the first first
Property, Plant and Equipment, Policy [Policy Text Block]	Property and Equipment Property and equipment are recorded at cost. Maintenance and repairs are expensed as incurred, and costs of new equipment and buildings, as well as costs of expansions or refurbishment of existing equipment and buildings, including interest where applicable, are capitalized. Depreciation and amortization are determined by the units of production method for most equipment and by the straight-line method for the remaining assets based on the estimated useful lives of the related assets. Estimated useful lives by major classes of property and equipment are as follows: Land improvements (15 – 30 years); Buildings (20 – 40 years); and Machinery and equipment (3 – 30 years). Depreciation expense calculated under the units of production method may The Company assesses impairment of property and equipment whenever changes in circumstances indicate that the carrying values of the asset or asset group(s) may not
Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]	Goodwill Goodwill represents the excess of purchase price over the assigned fair values of the assets and liabilities assumed in conjunction with an acquisition. Goodwill is reviewed for impairment annually as of December 31, may not 50% not not not
Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block]	Intangible Assets Intangible assets consist primarily of customer relationships and trade names and trademarks recorded as the result of acquisition activity. Intangible assets are amortized using the straight-line method over estimated useful lives ranging from 3 to 15 years.
Workers Compensation Insurance [Policy Text Block]	Workers Compensation The Company is self-insured, or maintains high deductible policies, for losses and liabilities associated with workers compensation claims. Losses are accrued based upon the Company’s estimates of the aggregate liability for claims incurred using historical experience and certain actuarial assumptions followed in the insurance industry. As of December 31, 2020 2019,
Accrued Liabilities [Policy Text Block]	Accrued Liabilities Accrued liabilities consist of the following (in thousands): December 31, 2020 2019 Accrued liabilities: Accrued bonus $ 3,747 $ 3,977 Accrued vacation payable 2,328 2,263 Foreign currency forward contracts 1,150 138 Finance lease liabilities 375 420 Workers compensation reserves 237 269 Other 8,977 5,083 Total accrued liabilities $ 16,814 $ 12,150
Derivatives, Policy [Policy Text Block]	Derivative Instruments The Company conducts business in various foreign countries and, from time to time, settles transactions in foreign currencies. The Company has established a program that utilizes foreign currency forward contracts to offset the risk associated with the effects of certain foreign currency exposures, typically arising from sales contracts denominated in Canadian currency. Foreign currency forward contracts are consistent with the Company’s strategy for financial risk management. The Company utilizes cash flow hedge accounting treatment for qualifying foreign currency forward contracts. Instruments that do not
Pension and Other Postretirement Plans, Pensions, Policy [Policy Text Block]	Pension Benefits The Company has two 2001.
Foreign Currency Transactions and Translations Policy [Policy Text Block]	Foreign Currency Transactions The functional currency of the Company, including its Mexican operations, is the United States dollar. Monetary assets and liabilities are remeasured at current exchange rates and non-monetary assets and liabilities are remeasured at historical exchange rates. Revenue and expenses related to monetary assets and liabilities are remeasured at average exchange rates and at historical exchange rates for the revenue and expenses related to non-monetary assets and liabilities. Transaction gains (losses) from foreign currency forward contracts designated as cash flow hedges are included in Accumulated other comprehensive loss as a separate component of Stockholders’ equity. For the years ended December 31, 2020, 2019, 2018,
Revenue [Policy Text Block]	Revenue Recognition The Company manufactures water infrastructure steel pipe products, which are generally made to custom specifications for installation contractors serving projects funded by public water agencies, as well as precast and reinforced concrete products. Generally, each of the Company’s contracts with its customers contains a single performance obligation, as the promise to transfer products is not not Revenue for water infrastructure steel pipe products is recognized over time as the manufacturing process progresses because of the Company’s right to payment for work performed to date plus a reasonable profit on cancellations for unique products that have no may Revenue for water infrastructure concrete pipe and precast concrete products is recognized at the time control is transferred to customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for the products. All variable consideration that may not The Company does not
Share-based Payment Arrangement [Policy Text Block]	Share-based Compensation The Company recognizes the compensation cost of employee and director services received in exchange for awards of equity instruments based on the grant date estimated fair value of the awards. The Company estimates the fair value of restricted stock units (“RSUs”) and performance share awards (“PSAs”) using the value of the Company’s stock on the date of grant. Share-based compensation cost is recognized over the period during which the employee or director is required to provide service in exchange for the award and, as forfeitures occur, the associated compensation cost recognized to date is reversed. For awards with performance-based payout conditions, the Company recognizes compensation cost based on the probability of achieving the performance conditions, with changes in expectations recognized as an adjustment to earnings in the period of change. Any recognized compensation cost is reversed if the conditions are ultimately not
Income Tax, Policy [Policy Text Block]	Income Taxes Income taxes are recorded using an asset and liability approach that requires the recognition of deferred income tax assets and liabilities for the expected future income tax consequences of events that have been recognized in the Company’s financial statements or income tax returns. Valuation allowances are established when necessary to reduce deferred income tax assets to the amount expected to be realized. The determination of the provision for income taxes requires significant judgment, the use of estimates, and the interpretation and application of complex tax laws. The provision for income taxes primarily reflects a combination of income earned and taxed in the various United States federal, state, local, and to a lesser extent, foreign jurisdictions. Jurisdictional tax law changes, increases or decreases in permanent differences between book and tax items, accruals or adjustments of accruals for unrecognized income tax benefits or valuation allowances, and the change in the mix of earnings from these taxing jurisdictions all affect the overall effective income tax rate. The Company records income tax reserves for federal, state, local, and international exposures relating to periods subject to audit. The development of reserves for these exposures requires judgments about tax issues, potential outcomes and timing, and is a subjective estimate. The Company assesses income tax positions and records income tax benefits for all years subject to examination based upon management’s evaluation of the facts, circumstances, and information available at the reporting dates. For those income tax positions where it is more-likely-than- not 50% not not no
Comprehensive Income, Policy [Policy Text Block]	Accumulated Other Comprehensive Loss Accumulated other comprehensive loss includes unrealized gains and losses on derivative instruments related to the effective portion of cash flow hedges and changes in the funded status of the defined benefit pension plans, both net of the related income tax effect.
Earnings Per Share, Policy [Policy Text Block]	Net Income per Share Basic net income per share is computed by dividing the net income by the weighted-average number of shares of common stock outstanding during the period. Diluted net income per share is computed by giving effect to all potential shares of common stock, including stock options, RSUs, and PSAs, to the extent dilutive. Performance-based PSAs are considered dilutive when the related performance conditions have been met assuming the end of the reporting period represents the end of the performance period. In periods with a net loss, all potential shares of common stock are excluded from the computation of diluted net loss per share as the impact would be antidilutive. Net income per basic and diluted weighted-average common share outstanding was calculated as follows (in thousands, except per share amounts): Year Ended December 31, 2020 2019 2018 Net income $ 19,050 $ 27,902 $ 20,312 Basic weighted-average common shares outstanding 9,788 9,741 9,726 Effect of potentially dilutive common shares (1) 85 38 7 Diluted weighted-average common shares outstanding 9,873 9,779 9,733 Net income per common share Basic $ 1.95 $ 2.86 $ 2.09 Diluted $ 1.93 $ 2.85 $ 2.09 ( 1 There were no antidilutive shares for the years ended December 31, 2020 2019. not December 31, 2018, not not December 31, 2018.
Concentration Risk, Credit Risk, Policy [Policy Text Block]	Concentrations of Credit Risk Financial instruments, which potentially subject the Company to concentrations of credit risk, consist principally of trade receivables, foreign currency forward contracts, and deferred compensation plan assets. Trade receivables generally represent a large number of customers, including municipalities, manufacturers, distributors, and contractors, dispersed across a wide geographic base. As of December 31, 2020, one 10% 10% December 31, 2019.
New Accounting Pronouncements, Policy [Policy Text Block]	Recent Accounting and Reporting Developments Accounting Changes In August 2018, No. 2018 13, 820 2018 13” 2018 13 January 1, 2020 not Recent Accounting Standards In August 2018, No. 2018 14, 715 20 2018 14” 2018 14 January 1, 2021, not In December 2019, No. 2019 12, 740 2019 12” 740, 740” 2019 12 740 2019 12 January 1, 2021, not In March 2020, No. 2020 04, 848 March 12, 2020 December 31, 2022. January 2021, No. 2021 01, not

Note 2 - Summary of Significa_2

Note 2 - Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Schedule of Accrued Liabilities [Table Text Block]	December 31, 2020 2019 Accrued liabilities: Accrued bonus $ 3,747 $ 3,977 Accrued vacation payable 2,328 2,263 Foreign currency forward contracts 1,150 138 Finance lease liabilities 375 420 Workers compensation reserves 237 269 Other 8,977 5,083 Total accrued liabilities $ 16,814 $ 12,150
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	Year Ended December 31, 2020 2019 2018 Net income $ 19,050 $ 27,902 $ 20,312 Basic weighted-average common shares outstanding 9,788 9,741 9,726 Effect of potentially dilutive common shares (1) 85 38 7 Diluted weighted-average common shares outstanding 9,873 9,779 9,733 Net income per common share Basic $ 1.95 $ 2.86 $ 2.09 Diluted $ 1.93 $ 2.85 $ 2.09

Note 3 - Business Combinations

Note 3 - Business Combinations (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Schedule of Business Acquisitions, by Acquisition [Table Text Block]	Assets Cash and cash equivalents $ 691 Trade and other receivables 7,089 Inventories 5,673 Prepaid expenses and other 356 Property and equipment 9,096 Operating lease right-of-use assets 21,684 Intangible assets 11,165 Total assets acquired 55,754 Liabilities Accounts payable 1,395 Accrued liabilities 1,189 Operating lease liabilities 20,454 Deferred income taxes 5,343 Other long-term liabilities 939 Total liabilities assumed 29,320 Goodwill 22,985 Total purchase consideration $ 49,419 Assets Cash and cash equivalents $ 912 Trade and other receivables 8,887 Contract assets 12,018 Inventories 7,937 Prepaid expenses and other 3,777 Property and equipment 34,827 Other assets 320 Total assets acquired 68,678 Liabilities Accounts payable 5,520 Accrued liabilities 1,599 Contract liabilities 123 Deferred income taxes 3,221 Total liabilities assumed 10,463 Bargain purchase gain (20,080 ) Total purchase consideration $ 38,135
Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block]	Estimated Useful Life Fair Value (In years) (In thousands) Customer relationships 11.0 $ 8,031 Trade names 10.0 2,093 Backlog 0.9 1,041 Total intangible assets 9.9 $ 11,165
Business Acquisition, Pro Forma Information [Table Text Block]	Year Ended December 31, 2020 2019 Net sales $ 289,496 $ 323,741 Net income 22,025 27,163 Year Ended December 31, 2018 Net sales $ 200,513 Net loss (15,102 )

Note 5 - Inventories (Tables)

Note 5 - Inventories (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Schedule Of Inventory Current And Non Current [Table Text Block]	December 31, 2020 2019 Raw materials $ 20,631 $ 26,772 Work-in-process 1,416 1,579 Finished goods 5,489 683 Supplies 1,641 1,620 Total inventories $ 29,177 $ 30,654

Note 6 - Property and Equipme_2

Note 6 - Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Property, Plant and Equipment [Table Text Block]	December 31, 2020 2019 Land and improvements $ 22,773 $ 22,480 Buildings 47,663 44,251 Machinery and equipment 127,679 115,237 Equipment under finance lease 2,589 2,081 200,704 184,049 Less accumulated depreciation and amortization (96,684 ) (86,244 ) 104,020 97,805 Construction in progress 6,164 1,826 Property and equipment, net $ 110,184 $ 99,631

Note 7 - Goodwill and Intangi_2

Note 7 - Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Schedule of Goodwill [Table Text Block]	Goodwill, December 31, 2019 $ - Acquisition of Geneva (Note 3) 22,985 Goodwill, December 31, 2020 $ 22,985
Schedule of Finite-Lived Intangible Assets [Table Text Block]	Gross Carrying Accumulated Intangible Amount Amortization Assets, Net As of December 31, 2020 Customer relationships $ 9,409 $ (1,634 ) $ 7,775 Trade names and trademarks 3,225 (720 ) 2,505 Other 329 (91 ) 238 Total $ 12,963 $ (2,445 ) $ 10,518 As of December 31, 2019 Customer relationships $ 1,378 $ (827 ) $ 551 Trade names and trademarks 1,132 (452 ) 680 Total $ 2,510 $ (1,279 ) $ 1,231
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	Year ending December 31, 2021 $ 1,262 2022 1,262 2023 1,171 2024 1,015 2025 1,015 Thereafter 4,793 Total amortization expense $ 10,518

Note 8 - Line of Credit and L_2

Note 8 - Line of Credit and Long-term Debt (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Schedule of Maturities of Long-term Debt [Table Text Block]	Year ending December 31, 2021 $ 7,746 2022 3,176 2023 2,840 Total future principal payments 13,762 Less: Unamortized debt issuance costs (173 ) Less: Current portion of long-term debt (7,701 ) Long-term debt, net of current portion $ 5,888

Note 9 - Leases (Tables)

Note 9 - Leases (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Lessee, Lease, Assets and Liabilities [Table Text Block]	December 31, 2020 2019 Right-of-use assets: Finance leases, net, included in Property and equipment (1) $ 1,288 $ 1,203 Operating leases 30,813 7,683 Total right-of-use assets $ 32,101 $ 8,886 Lease liabilities: Finance leases $ 1,729 $ 1,641 Operating leases 30,115 7,889 Total lease liabilities $ 31,844 $ 9,530
Lease, Cost [Table Text Block]	Year Ended December 31, 2020 2019 Finance lease cost: Amortization of right-of-use assets $ 422 $ 435 Interest on lease liabilities 79 57 Operating lease cost 3,647 1,934 Short-term lease cost 745 1,442 Variable lease cost 199 141 Total lease cost $ 5,092 $ 4,009
Lessee, Liability, Maturity [Table Text Block]	Finance Leases Operating Leases 2021 $ 454 $ 3,178 2022 433 2,819 2023 230 2,561 2024 544 2,416 2025 301 2,358 Thereafter - 27,513 Total lease payments 1,962 40,845 Amount representing interest (233 ) (10,730 ) Present value of lease liabilities 1,729 30,115 Current portion of lease liabilities (1) (375 ) (2,204 ) Long-term lease liabilities (2) $ 1,354 $ 27,911
Lease Terms and Discount Rates for Lease Liabilities [Table Text Block]	December 31, 2020 2019 Weighted-average remaining lease term (years) Finance leases 3.67 3.79 Operating leases 18.21 8.31 Weighted-average discount rate Finance leases 5.22 % 5.40 % Operating leases 3.36 % 4.50 %
Other Information Related to Operating and Finance Leases [Table Text Block]	Year Ended December 31, 2020 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from finance leases $ (79 ) $ (57 ) Operating cash flows from operating leases (3,481 ) (1,909 ) Financing cash flows from finance leases (420 ) (434 ) Right-of-use assets obtained in exchange for finance lease liabilities 507 819 Right-of-use assets obtained in exchange for operating lease liabilities 4,471 1,335

Note 10 - Fair Value Measurem_2

Note 10 - Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	Total Level 1 Level 2 Level 3 As of December 31, 2020 Financial assets: Deferred compensation plan $ 4,717 $ 3,884 $ 833 $ - Financial liabilities: Foreign currency forward contracts $ (1,150 ) $ - $ (1,150 ) $ - As of December 31, 2019 Financial assets: Deferred compensation plan $ 5,150 $ 4,268 $ 882 $ - Financial liabilities: Foreign currency forward contracts $ (138 ) $ - $ (138 ) $ -

Note 13 - Share-based Compens_2

Note 13 - Share-based Compensation (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]	Year Ended December 31, 2020 2019 2018 Cost of sales $ 822 $ 383 $ 12 Selling, general, and administrative expense 2,266 1,326 269 Total $ 3,088 $ 1,709 $ 281
Schedule of Unvested Restricted Stock Units and Performance Share Awards Activity [Table Text Block]	Number of RSUs and PSAs (1) Weighted- Average Grant Date Fair Value Unvested RSUs and PSAs as of December 31, 2019 85,170 $ 23.56 RSUs and PSAs granted 97,834 26.61 Unvested RSUs and PSAs canceled (3,752 ) 23.56 RSUs and PSAs vested (2) (49,680 ) 23.56 Unvested RSUs and PSAs as of December 31, 2020 129,572 25.86

Note 15 - Revenue (Tables)

Note 15 - Revenue (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Revenue from External Customers by Geographic Areas [Table Text Block]	Year Ended December 31, 2020 2019 2018 Net sales by geographic region: United States $ 254,956 $ 252,797 $ 161,415 Canada 30,951 26,520 10,734 Total $ 285,907 $ 279,317 $ 172,149
Disaggregation of Revenue [Table Text Block]	Year Ended December 31, 2020 2019 2018 Over time $ 241,690 $ 279,317 $ 172,149 Point in time 44,217 - - Net sales $ 285,907 $ 279,317 $ 172,149

Note 16 - Income Taxes (Tables)

Note 16 - Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]	Year Ended December 31, 2020 2019 2018 United States $ 24,768 $ 32,244 $ 16,207 Foreign 866 396 853 Total $ 25,634 $ 32,640 $ 17,060
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	Year Ended December 31, 2020 2019 2018 Current: Federal $ 958 $ 174 $ (117 ) State 1,342 (16 ) 99 Foreign 243 439 395 Total current income tax expense 2,543 597 377 Deferred: Federal 4,380 3,597 (2,954 ) State (386 ) 561 (807 ) Foreign 47 (17 ) 132 Total deferred income tax expense (benefit) 4,041 4,141 (3,629 ) Total income tax expense (benefit) $ 6,584 $ 4,738 $ (3,252 )
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	Year Ended December 31, 2020 2019 2018 Income tax expense at federal statutory rate $ 5,383 $ 6,854 $ 3,583 State expense (benefit), net of federal income tax effect 953 1,261 (218 ) Federal and state income tax credits - - (7 ) Change in valuation allowance (181 ) (3,564 ) (2,618 ) Tax windfall on share-based compensation - - (369 ) Bargain purchase gain - - (4,228 ) Nondeductible expenses 447 (24 ) 427 Foreign rate differential 78 36 77 Other (96 ) 175 101 Income tax expense (benefit) $ 6,584 $ 4,738 $ (3,252 ) Effective income tax rate 25.7 % 14.5 % (19.1 )%
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	December 31, 2020 2019 Deferred income tax assets: Accrued employee benefits $ 3,525 $ 3,089 Inventories 73 147 Trade receivable, net 958 788 Net operating loss carryforwards 3,231 5,391 Tax credit carryforwards 2,699 5,173 Other 389 509 10,875 15,097 Valuation allowance (6,228 ) (6,126 ) 4,647 8,971 Deferred income tax liabilities: Contract assets, net (1,366 ) (1,703 ) Property and equipment (12,029 ) (10,578 ) Intangible assets (2,737 ) (226 ) Prepaid expenses (889 ) (587 ) (17,021 ) (13,094 ) Net deferred income tax liabilities $ (12,374 ) $ (4,123 ) Amounts are presented in the Consolidated Balance Sheets as follows: Deferred income tax assets, included in Other assets $ 107 $ 142 Deferred income taxes (12,481 ) (4,265 ) Net deferred income tax liabilities $ (12,374 ) $ (4,123 )
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]	Year Ended December 31, 2020 2019 2018 Unrecognized income tax benefits, beginning of year $ 4,350 $ 4,350 $ 4,116 Increases for positions taken in the current year - - 234 Unrecognized income tax benefits, end of year $ 4,350 $ 4,350 $ 4,350

Note 17 - Accumulated Other C_2

Note 17 - Accumulated Other Comprehensive Loss (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	December 31, 2020 2019 Pension liability adjustment, net of income tax benefit of $679 and $671 $ (1,795 ) $ (1,770 ) Unrealized loss on cash flow hedges, net of income tax benefit of $20 and $11 (71 ) (44 ) Total $ (1,866 ) $ (1,814 )
Schedule of Changes in Accumulated Other Comprehensive Income Loss [Table Text Block]	Pension Liability Adjustment Unrealized Loss on Cash Flow Hedges Total Balance, December 31, 2019 $ (1,770 ) $ (44 ) $ (1,814 ) Other comprehensive loss before reclassifications (3 ) (308 ) (311 ) Amounts reclassified from Accumulated other comprehensive loss (22 ) 281 259 Net current period adjustments to Other comprehensive loss (25 ) (27 ) (52 ) Balance, December 31, 2020 $ (1,795 ) $ (71 ) $ (1,866 )
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]	Amount reclassified from Accumulated Other Comprehensive Loss Affected line item in the Details about Accumulated Other Year Ended December 31, Consolidated Statements Comprehensive Loss Components 2020 2019 2018 of Operations Pension liability adjustment: Net periodic pension cost: Service cost $ (16 ) $ (11 ) $ (11 ) Cost of sales Non-service cost 46 (15 ) 52 Other income Associated income tax (expense) benefit (8 ) 4 8 Income tax expense (benefit) 22 (22 ) 49 Unrealized gain (loss) on cash flow hedges: Gain (loss) on cash flow hedges (378 ) 5 13 Net sales Associated income tax (expense) benefit 97 2 (1 ) Income tax expense (benefit) (281 ) 7 12 Total reclassifications for the period $ (259 ) $ (15 ) $ 61

Schedule II - Valuation and Q_2

Schedule II - Valuation and Qualifying Accounts (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Summary of Valuation and Qualifying Accounts [Table Text Block]	Balance at Beginning of Period Charged to Profit and Loss Deduction from Reserves Balance at End of Period Year Ended December 31, 2020: Allowance for doubtful accounts $ 801 430 (464 ) $ 767 Valuation allowance for deferred income tax assets 6,126 240 (138 ) 6,228 Year Ended December 31, 2019: Allowance for doubtful accounts $ 660 $ 312 $ (171 ) $ 801 Valuation allowance for deferred income tax assets 9,433 345 (3,652 ) 6,126 Year Ended December 31, 2018: Allowance for doubtful accounts $ 477 $ 449 $ (266 ) $ 660 Valuation allowance for deferred income tax assets 10,413 1,785 (2,765 ) 9,433

Note 1 - Organization (Details

Note 1 - Organization (Details Textual)	Jan. 31, 2020	Dec. 31, 2020
Number of Operating Segments	1	1

Note 2 - Summary of Significa_3

Note 2 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019USD ($)	Dec. 31, 2020USD ($)shares	Dec. 31, 2019USD ($)shares	Dec. 31, 2018USD ($)shares
Revenue from Contract with Customer, Including Assessed Tax		$ 285,907	$ 279,317	$ 172,149
Workers' Compensation Liability		1,700	1,700
Workers' Compensation Liability, Current		237	269
Foreign Currency Transaction Gain (Loss), Realized		$ (1,100)	$ 500	$ (400)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares		0	0	63,000
Restricted Stock Units and Performance Share Award Target Level, Percentage			100.00%
Number of Customers with Receivable Balance in Excess of Ten Percent of Receivables		1	1
Performance Shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares				39,000
Restricted Stock Units and Performance Share Award Target Level, Percentage		100.00%
Accrued Liability [Member]
Workers' Compensation Liability, Current		$ 200	$ 300
Other Long-term Liabilities [Member]
Workers' Compensation Liability, Noncurrent		$ 1,500	$ 1,400
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)		3 years
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)		15 years
Land Improvements [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)		15 years
Land Improvements [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)		30 years
Building [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)		20 years
Building [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)		40 years
Machinery and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)		3 years
Machinery and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)		30 years
Out of Period Adjustment [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ (1,200)

Note 2 - Summary of Significa_4

Note 2 - Summary of Significant Accounting Policies - Summary of Accrued Liabilities (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
Accrued bonus		$ 3,747	$ 3,977
Accrued vacation payable		2,328	2,263
Foreign currency forward contracts		1,150	138
Finance lease liabilities	[1]	375
Workers compensation reserves		237	269
Other		8,977	5,083
Total accrued liabilities		16,814	12,150
Accrued Liability [Member]
Finance lease liabilities		375	420
Workers compensation reserves		$ 200	$ 300
[1]	Current portion of finance lease liabilities are included in Accrued liabilities.

Note 2 - Summary of Significa_5

Note 2 - Summary of Significant Accounting Policies - Loss Per Basic and Diluted Weighted Average Common Share Outstanding for Continuing and Discontinued Operations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net income		$ 19,050	$ 27,902	$ 20,312
Basic (in shares)		9,788	9,741	9,726
Effect of potentially dilutive common shares (in shares)	[1]	85	38	7
Diluted weighted-average common shares outstanding (in shares)		9,873	9,779	9,733
Net income per common share
Basic (in dollars per share)		$ 1.95	$ 2.86	$ 2.09
Diluted (in dollars per share)		$ 1.93	$ 2.85	$ 2.09
[1]	There were no antidilutive shares for the years ended December 31, 2020 or 2019. The weighted-average number of antidilutive shares not included in the computation of diluted net income per share was approximately 63,000 for the year ended December 31, 2018, including approximately 39,000 of PSAs, at the target level of 100%, that were not included because the performance conditions had not been met as of December 31, 2018.

Note 3 - Business Combination_2

Note 3 - Business Combinations (Details Textual) $ in Thousands	Jan. 31, 2020USD ($)	Jul. 27, 2018USD ($)	Jun. 30, 2020USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Number of Operating Segments	1					1
Geneva Pipe Company, Inc. [Member]
Business Acquisition, Percentage of Voting Interests Acquired	100.00%
Business Combination, Consideration Transferred, Total	$ 49,419
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Trade and Other Receivables			$ (100)
Business Combination, Acquisition Related Costs						$ 2,600	$ 600
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual					$ 44,200
Ameron Water Transmission Group, LLC [Member]
Business Acquisition, Percentage of Voting Interests Acquired		100.00%
Business Combination, Consideration Transferred, Total		$ 38,135
Business Combination, Acquisition Related Costs								$ 2,600
Business Combination, Bargain Purchase, Increase (Decrease) in Gain Recognized, Measurement Period Adjustment				$ (1,800)
Business Acquisition, Increase (Decrease) in Inventories, Measurement Period Adjustment				$ (2,000)
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred							$ 0

Note 3 - Business Combination_3

Note 3 - Business Combinations - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Jul. 27, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Liabilities
Goodwill			$ 22,985	$ 0
Bargain purchase gain			$ 0	$ 0	$ (20,080)
Geneva Pipe Company, Inc. [Member]
Assets
Cash and cash equivalents	$ 691
Trade and other receivables	7,089
Inventories	5,673
Prepaid expenses and other	356
Property and equipment	9,096
Operating lease right-of-use assets	21,684
Intangible assets	11,165
Total assets acquired	55,754
Liabilities
Accounts payable	1,395
Accrued liabilities	1,189
Operating lease liabilities	20,454
Deferred income taxes	5,343
Other long-term liabilities	939
Total liabilities assumed	29,320
Goodwill	22,985
Total purchase consideration	$ 49,419
Ameron Water Transmission Group, LLC [Member]
Assets
Cash and cash equivalents		$ 912
Trade and other receivables		8,887
Inventories		7,937
Prepaid expenses and other		3,777
Property and equipment		34,827
Total assets acquired		68,678
Contract assets		12,018
Other assets		320
Liabilities
Accounts payable		5,520
Accrued liabilities		1,599
Deferred income taxes		3,221
Total liabilities assumed		10,463
Total purchase consideration		38,135
Contract liabilities		123
Bargain purchase gain		$ (20,080)

Note 3 - Business Combination_4

Note 3 - Business Combinations - Intangible Assets Acquired (Details) - Geneva Pipe Company, Inc. [Member] $ in Thousands	Jan. 31, 2020USD ($)
Intangible Asset Acquired, Useful Life (Year)	9 years 10 months 24 days
Intangible Asset Acquired, Fair Value	$ 11,165
Customer Relationships [Member]
Intangible Asset Acquired, Useful Life (Year)	11 years
Intangible Asset Acquired, Fair Value	$ 8,031
Trade Names [Member]
Intangible Asset Acquired, Useful Life (Year)	10 years
Intangible Asset Acquired, Fair Value	$ 2,093
Backlog [Member]
Intangible Asset Acquired, Useful Life (Year)	10 months 24 days
Intangible Asset Acquired, Fair Value	$ 1,041

Note 3 - Business Combination_5

Note 3 - Business Combinations - Pro Forma Summary (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Geneva Pipe Company, Inc. [Member]
Net sales	$ 289,496	$ 323,741
Net income	$ 22,025	$ 27,163
Ameron Water Transmission Group, LLC [Member]
Net sales			$ 200,513
Net income			$ (15,102)

Note 4 - Discontinued Operati_2

Note 4 - Discontinued Operations (Details Textual) - Atchison Facility [Member] $ in Millions	Dec. 26, 2017USD ($)
Disposal Group, Including Discontinued Operation, Consideration	$ 37.2
Placed in Escrow Unitil February 2018 [Member]
Escrow Deposits Related to Property Sales	0.8
Placed in Escrow Until December 2018 [Member]
Escrow Deposits Related to Property Sales	$ 3.7

Note 5 - Inventories - Componen

Note 5 - Inventories - Components of Inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Raw materials	$ 20,631	$ 26,772
Work-in-process	1,416	1,579
Finished goods	5,489	683
Supplies	1,641	1,620
Total inventories	$ 29,177	$ 30,654

Note 6 - Property and Equipme_3

Note 6 - Property and Equipment (Details Textual) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Dec. 31, 2018	Aug. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment, Net, Ending Balance			$ 110,184	$ 99,631
Proceeds from Sale of Property, Plant, and Equipment, Total			0	39	$ 141
Monterrey, Mexico Facility [Member]
Proceeds from Sale of Property, Plant, and Equipment, Total	$ 2,700
Gain (Loss) on Disposition of Property Plant Equipment, Total	$ 200
Property in Houston, Texas [Member]
Proceeds from Sale of Property, Plant, and Equipment, Total		$ 5,800
Gain (Loss) on Disposition of Property Plant Equipment, Total		$ 2,800
MEXICO
Property, Plant and Equipment, Net, Ending Balance			$ 20,300	$ 19,800

Note 6 - Property and Equipme_4

Note 6 - Property and Equipment - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property and equipment, gross	$ 200,704	$ 184,049
Less accumulated depreciation and amortization	(96,684)	(86,244)
Property, Plant and Equipment, Net, Excluding Construction In Progress	104,020	97,805
Property and equipment, net	110,184	99,631
Land Improvements [Member]
Property and equipment, gross	22,773	22,480
Building [Member]
Property and equipment, gross	47,663	44,251
Machinery and Equipment [Member]
Property and equipment, gross	127,679	115,237
Equipment Under Finance Lease [Member]
Property and equipment, gross	2,589	2,081
Construction in Progress [Member]
Property and equipment, net	$ 6,164	$ 1,826

Note 7 - Goodwill and Intangi_3

Note 7 - Goodwill and Intangible Assets - Schedule of Goodwill (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)
Goodwill	$ 0
Goodwill	22,985
Geneva Pipe Company, Inc. [Member]
Acquisition of Geneva (Note 3)	$ 22,985

Note 7 - Goodwill and Intangi_4

Note 7 - Goodwill and Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Intangible Assets, Gross	$ 12,963	$ 2,510
Intangible Assets, Accumulated amortization	(2,445)	(1,279)
Intangible assets, net	10,518	1,231
Customer Relationships [Member]
Intangible Assets, Gross	9,409	1,378
Intangible Assets, Accumulated amortization	(1,634)	(827)
Intangible assets, net	7,775	551
Trademarks and Trade Names [Member]
Intangible Assets, Gross	3,225	1,132
Intangible Assets, Accumulated amortization	(720)	(452)
Intangible assets, net	2,505	$ 680
Other Intangible Assets [Member]
Intangible Assets, Gross	329
Intangible Assets, Accumulated amortization	(91)
Intangible assets, net	$ 238

Note 7 - Goodwill and Intangi_5

Note 7 - Goodwill and Intangible Assets - Summary of Estimated Amortization Expense (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
2021	$ 1,262
2022	1,262
2023	1,171
2024	1,015
2025	1,015
Thereafter	4,793
Total amortization expense	$ 10,518	$ 1,231

Note 8 - Line of Credit and L_3

Note 8 - Line of Credit and Long-term Debt (Details Textual) $ in Thousands	Oct. 25, 2018USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Mar. 31, 2020USD ($)
Interest Expense, Debt and Finance Leases, Net of Amounts Capitalized		$ 900	$ 500	$ 600
Interest Costs Capitalized		100
Letters of Credit Outstanding, Amount		$ 1,600
Wells Fargo Bank, N.A. [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 74,000
Maximum Senior Leverage Ratio		3
Minimum Fixed Charge Coverage Ratio		1.10
Letters of Credit Outstanding, Amount		$ 1,600
Wells Fargo Bank, N.A. [Member] | Term Loan [Member]
Debt Instrument, Face Amount					$ 15,900
Long-term Debt, Monthly Repayment of Principal		300
Long-term Debt, Total		$ 13,800
Debt Instrument, Covenant, Maximum Debt Percentage of Securing Property		60.00%
Debt Instrument, Covenant, Repayment Percentage of Excess Cash Flow		20.00%
Debt Instrument, Prepayment from Excess Cash Flow Generated, Amount Payable in Next 12 Months		$ 4,600
Wells Fargo Bank, N.A. [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Term Loan [Member]
Debt Instrument, Basis Spread on Variable Rate		2.00%
Wells Fargo Bank, N.A. [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | Term Loan [Member]
Debt Instrument, Basis Spread on Variable Rate		2.50%
Wells Fargo Bank, N.A. [Member] | Revolving Credit Facility [Member]
Long-term Line of Credit, Total		$ 0	$ 0
Line of Credit Facility, Remaining Borrowing Capacity		$ 53,000
Debt, Weighted Average Interest Rate		1.73%	3.43%
Wells Fargo Bank, N.A. [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.25%
Wells Fargo Bank, N.A. [Member] | Revolving Credit Facility [Member] | Maximum [Member]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.375%
Wells Fargo Bank, N.A. [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Wells Fargo Bank, N.A. [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate	2.00%

Note 8 - Line of Credit and L_4

Note 8 - Line of Credit and Long-term Debt - Future Principal Payments of Long-term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Less: Current portion of long-term debt	$ (7,701)	$ 0
Long-term debt, net of current portion	5,888	$ 0
Term Loan [Member] | Wells Fargo Bank, N.A. [Member]
2021	7,746
2022	3,176
2023	2,840
Total future principal payments	13,762
Less: Unamortized debt issuance costs	(173)
Less: Current portion of long-term debt	(7,701)
Long-term debt, net of current portion	$ 5,888

Note 9 - Leases (Details Textua

Note 9 - Leases (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
Operating Lease, Right-of-Use Asset		$ 30,813	$ 7,683
Finance Lease, Right-of-Use Asset, Accumulated Amortization		1,300	900
Operating Leases, Rent Expense, Net, Total	$ 2,700
Operating Lease, Liability, Total		$ 30,115	$ 7,889
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset				$ 8,000
Operating Lease, Liability, Total				$ 8,000

Note 9 - Leases - Leases Record

Note 9 - Leases - Leases Recorded on the Consolidated Balance Sheet (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
Operating leases, Right-of-use assets		$ 30,813	$ 7,683
Total right-of-use assets		32,101	8,886
Present value of lease liabilities, finance leases		1,729	1,641
Present value of lease liabilities, operating leases		30,115	7,889
Total lease liabilities		31,844	9,530
Property and Equipment [Member]
Finance leases, net, included in Property and equipment	[1]	$ 1,288	$ 1,203
[1]	Finance lease right-of-use assets are presented net of accumulated amortization of $1.3 million and $0.9 million as of December 31, 2020 and 2019, respectively.

Note 9 - Leases - Lease Cost (D

Note 9 - Leases - Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Amortization of right-of-use assets	$ 422	$ 435
Interest on lease liabilities	79	57
Operating lease cost	3,647	1,934
Short-term lease cost	745	1,442
Variable lease cost	199	141
Total lease cost	$ 5,092	$ 4,009

Note 9 - Leases - Future Maturi

Note 9 - Leases - Future Maturities of Lease Liabilities (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
2021, finance leases		$ 454
2021, operating leases		3,178
2022, finance leases		433
2022, operating leases		2,819
2023, finance leases		230
2023, operating leases		2,561
2024, finance leases		544
2024, operating leases		2,416
2025, finance leases		301
2025, operating leases		2,358
Thereafter, finance leases		0
Thereafter		27,513
Total lease payments, finance leases		1,962
Total lease payments, operating leases		40,845
Amount representing interest, finance leases		(233)
Amount representing interest, operating leases		(10,730)
Present value of lease liabilities, finance leases		1,729	$ 1,641
Present value of lease liabilities, operating leases		30,115	7,889
Current portion of lease liabilities, included in Accrued liabilities, finance leases	[1]	(375)
Current portion of lease liabilities, operating leases		(2,204)	(1,642)
Long-term lease liabilities, finance leases	[2]	1,354
Long-term lease liabilities, operating leases		$ 27,911	$ 6,247
[1]	Current portion of finance lease liabilities are included in Accrued liabilities.
[2]	Long-term finance lease liabilities, less current portion are included in Other long-term liabilities.

Note 9 - Leases - Lease Terms a

Note 9 - Leases - Lease Terms and Discount Rates for Lease Liabilities (Details)	Dec. 31, 2020	Dec. 31, 2019
Finance leases, weighted-average remaining lease term (Year)	3 years 8 months 1 day	3 years 9 months 14 days
Operating leases, weighted-average remaining lease term (Year)	18 years 2 months 15 days	8 years 3 months 21 days
Finance leases, weighted-average discount rate	5.22%	5.40%
Operating leases, weighted-average discount rate	3.36%	4.50%

Note 9 - Leases - Other Informa

Note 9 - Leases - Other Information Related to Operating and Finance Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating cash flows from finance leases	$ (79)	$ (57)
Operating cash flows from operating leases	(3,481)	(1,909)
Financing cash flows from finance leases	(420)	(434)	$ (398)
Right-of-use assets obtained in exchange for finance lease liabilities	507	819	599
Right-of-use assets obtained in exchange for operating lease liabilities	$ 4,471	$ 1,335	$ 0

Note 10 - Fair Value Measurem_3

Note 10 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred compensation plan	$ 4,717	$ 5,150
Foreign currency forward contracts	(1,150)	(138)
Fair Value, Inputs, Level 1 [Member]
Deferred compensation plan	3,884	4,268
Foreign currency forward contracts	0	0
Fair Value, Inputs, Level 2 [Member]
Deferred compensation plan	833	882
Foreign currency forward contracts	(1,150)	(138)
Fair Value, Inputs, Level 3 [Member]
Deferred compensation plan	0	0
Foreign currency forward contracts	$ 0	$ 0

Note 11 - Derivative Instrume_2

Note 11 - Derivative Instruments and Hedging Activities (Details Textual) - Foreign Exchange Forward [Member] $ in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2020CAD ($)	Dec. 31, 2019CAD ($)
Unrealized Loss on Foreign Currency Derivatives, before Tax	$ 100
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months	0
Designated as Hedging Instrument [Member]
Derivative, Notional Amount	15,300	$ 6,100		$ 19.5	$ 7.9
Not Designated as Hedging Instrument [Member]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net, Total	$ (600)	$ (100)	$ 200

Note 12 - Retirement Plans (Det

Note 12 - Retirement Plans (Details Textual)	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Deferred Compensation Plan Assets	$ 4,717,000	$ 5,150,000
Retirement Plan Expense	$ 1,600,000	$ 1,200,000	$ 900,000
Defined Contribution Plan [Member]
Company Matching Percentage on First Eight Percent of Employee Contributions	50.00%
Company Matching Percentage on First Six Percent of Employee Contributions		50.00%	50.00%
Employee Contribution Percentage for Which Company Will Match at Fifty Percent	8.00%	6.00%	6.00%
Defined Contribution Plan Number of Investment Options	23
Pension Plan [Member]
Number of Non-contributory Defined Benefit Plans	2
Liability, Defined Benefit Plan, Total	$ 1,600,000	$ 1,600,000
Accumulated Other Comprehensive Income (Loss), Unrecognized Net Actuarial Losses, Net of Tax	1,800,000	1,800,000
Defined Benefit Plan, Accumulated Benefit Obligation	6,500,000	6,400,000
Defined Benefit Plan, Plan Assets, Amount, Ending Balance	4,900,000	4,800,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total	$ 0	$ 0	$ 0
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	2.04%	2.83%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	7.00%	7.50%
Non-qualified Retirement Savings Plan [Member]
Company Matching Percentage on First Ten Thousand Dollar Employee Contributions	50.00%
Officer Contribution for Which Company Will Match at Fifty Percent	$ 10,000
Select Employee Contribution for Which Company Will Match at Fifty Percent	5,000
Non-qualified Retirement Savings Plan [Member] | Other Long-term Liabilities [Member]
Deferred Compensation Liability, Classified, Noncurrent, Total	4,700,000	$ 5,200,000
Non-qualified Retirement Savings Plan [Member] | Other Noncurrent Assets [Member]
Deferred Compensation Plan Assets	$ 4,700,000	$ 5,200,000

Note 13 - Share-based Compens_3

Note 13 - Share-based Compensation (Details Textual) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2020USD ($)$ / sharesshares	Dec. 31, 2019USD ($)$ / sharesshares	Dec. 31, 2018USD ($)$ / sharesshares
Number Of Active Stock Incentive Plans		1
Common Stock, Capital Shares Reserved for Future Issuance (in shares)		354,022
Common Stock, Capital Shares Reserved for Future Issuance, Percentage Vesting of Outstanding PSAs Assumed		100.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total (in shares)		0	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)		24,000	0	0
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share) | $ / shares		$ 24.15
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value | $		$ 100
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)		0
Restricted Stock Units and Performance Share Award Target Level, Percentage			100.00%
Director [Member]
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued (in shares)		17,442	11,924	11,172
Share-based Compensation Arrangement by Stock-based Payment Award, Grant Date Fair Value (in dollars per share) | $ / shares		$ 25.81	$ 25.16	$ 21.48
Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month)		60 months
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)		10 years
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month)		3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares		$ 26.61	23.56
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)				0
Performance Shares [Member]
Restricted Stock Units and Performance Share Award Target Level, Percentage		100.00%
Performance Awards Issued Multiplier		136.00%
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number At Target Level Of Performance (in shares)		91,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares		$ 26.61	$ 23.56	$ 19.97
Performance Shares [Member] | Minimum [Member]
Performance Awards Issued Multiplier		0.00%
Performance Shares [Member] | Maximum [Member]
Performance Awards Issued Multiplier		200.00%
Restricted Stock Units and Performance Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares		$ 26.61
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	[1]	97,834
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value | $		$ 2,000	$ 0	$ 1,600
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount | $		$ 2,500
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)		1 year 7 months 6 days
[1]	The number of PSAs disclosed in this table are at the target level of 100%.

Note13 - Share-based Compensati

Note13 - Share-based Compensation - Share-based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based compensation expense	$ 3,088	$ 1,709	$ 281
Cost of Sales [Member]
Share-based compensation expense	822	383	12
Selling, General and Administrative Expenses [Member]
Share-based compensation expense	$ 2,266	$ 1,326	$ 269

Note 13 - Share-based Compens_4

Note 13 - Share-based Compensation - RSU and PSA Activity (Details) - Restricted Stock Units and Performance Stock Awards [Member]	12 Months Ended
	Dec. 31, 2020$ / sharesshares
Unvested RSUs and PSAs (in shares) | shares	85,170	[1]
Unvested RSUs and PSAs, weighted average grant date fair value (in dollars per share) | $ / shares	$ 23.56
RSUs and PSAs granted (in shares) | shares	97,834	[1]
RSUs and PSAs granted, weighted average grant date fair value (in dollars per share) | $ / shares	$ 26.61
Unvested RSUs and PSAs canceled (in shares) | shares	(3,752)	[1]
Unvested RSUs and PSAs canceled, weighted average grant date fair value (in dollars per share) | $ / shares	$ 23.56
RSUs and PSAs vested (2) (in shares) | shares	(49,680)	[1],[2]
RSUs and PSAs vested (2) (in dollars per share) | $ / shares	$ 23.56	[2]
Unvested RSUs and PSAs (in shares) | shares	129,572	[1]
Unvested RSUs and PSAs, weighted average grant date fair value (in dollars per share) | $ / shares	$ 25.86
[1]	The number of PSAs disclosed in this table are at the target level of 100%.
[2]	For the PSAs vested on March 31, 2020; the actual number of common shares that were issued was determined by multiplying the PSAs by a payout percentage of 136%, based on the performance-based conditions achieved.

Note 14 - Commitments and Con_2

Note 14 - Commitments and Contingencies (Details Textual) $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2017USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Jun. 30, 2014USD ($)
Letters of Credit Outstanding, Amount		$ 1.6
Fire [Member]
Business Interruption, Incremental Production Costs, Net of Insurance Recovery		$ (1.4)	$ 1.6
Portland Harbor Natural Resources Trustee Council [Member]
Loss Contingency, Accrual, Current				$ 0.4
Portland Harbor Superfund Site [Member]
Number Of Potentially Responsible Parties	150
Estimated Cost of EPA Selected Remedy	$ 1,000
Estimated Time to Complete Selected EPA Remedy (Year)	13 years
Lower Willamette Group [Member]
Number Of Potentially Responsible Parties	14

Note 15 - Revenue 1 (Details Te

Note 15 - Revenue 1 (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Jan. 01, 2018USD ($)	Dec. 31, 2017USD ($)
Stockholders' Equity Attributable to Parent, Ending Balance	$ 269,626	$ 248,158	$ 218,590		$ 200,264
Increase (Decrease) in Revenue from Contract with Customers, Including Assessed Tax	2,200	(1,200)	(200)
Contract with Customer, Liability, Revenue Recognized	12,300	$ 3,700	2,600
Revenue, Remaining Performance Obligation, Amount	$ 167,000
Ameron Water Transmission Group, LLC [Member]
Contract with Customer, Asset, Increase (Decrease) for Contract Acquired in Business Combination			12,000
Contract with Customer, Liability, Increase (Decrease) for Contract Acquired in Business Combination			$ 100
Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Number of Major Customers	1	1	0
Concentration Risk, Percentage	16.00%	23.00%
Retained Earnings [Member]
Stockholders' Equity Attributable to Parent, Ending Balance	$ 148,381	$ 129,331	$ 101,194		81,757
Accounting Standards Update 2014-09 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Stockholders' Equity Attributable to Parent, Ending Balance					(875)
Accounting Standards Update 2014-09 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings [Member]
Stockholders' Equity Attributable to Parent, Ending Balance				$ (900)	$ (875)

Note 15 - Revenue 2 (Details Te

Note 15 - Revenue 2 (Details Textual)	Dec. 31, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Percentage	79.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Percentage	20.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year)	1 year

Note 15 - Revenue - Net Sales F

Note 15 - Revenue - Net Sales From Continuing Operations by Geographic Region (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net sales	$ 285,907	$ 279,317	$ 172,149
UNITED STATES
Net sales	254,956	252,797	161,415
CANADA
Net sales	$ 30,951	$ 26,520	$ 10,734

Note 15 - Revenue - Disaggregat

Note 15 - Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net sales	$ 285,907	$ 279,317	$ 172,149
Transferred over Time [Member]
Net sales	241,690	279,317	172,149
Transferred at Point in Time [Member]
Net sales	$ 44,217	$ 0	$ 0

Note 16 - Income Taxes (Details

Note 16 - Income Taxes (Details Textual) - USD ($) $ in Thousands	Jan. 01, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Unrecognized Tax Benefits, Income Tax Penalties Accrued		$ 0	$ 0
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%	21.00%	21.00%	35.00%
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect	$ 200
Domestic Tax Authority [Member]
Tax Credit Carryforward, Amount		$ 2,000
Domestic Tax Authority [Member] | Capital Loss Carryforward [Member]
Tax Credit Carryforward, Amount		$ 1,000
Tax Credit Carryforward, Expiration Year		2024
Domestic Tax Authority [Member] | Minimum [Member]
Tax Credit Carryforward, Expiration Year		2023
Domestic Tax Authority [Member] | Maximum [Member]
Tax Credit Carryforward, Expiration Year		2034
State and Local Jurisdiction [Member]
Tax Credit Carryforward, Amount		$ 4,200
Tax Credit Carryforward, Expiration Year		2021
Operating Loss Carryforwards, Total		$ 30,000
State and Local Jurisdiction [Member] | Minimum [Member]
Operating Loss Carryforwards, Expiration Year		2021
State and Local Jurisdiction [Member] | Maximum [Member]
Operating Loss Carryforwards, Expiration Year		2038
Foreign Tax Authority [Member]
Operating Loss Carryforwards, Total		$ 4,400
Foreign Tax Authority [Member] | Minimum [Member]
Operating Loss Carryforwards, Expiration Year		2023
Foreign Tax Authority [Member] | Maximum [Member]
Operating Loss Carryforwards, Expiration Year		2030

Note 16 - Income Taxes - Income

Note 16 - Income Taxes - Income (Loss) from Continuing Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
United States	$ 24,768	$ 32,244	$ 16,207
Foreign	866	396	853
Income before income taxes	$ 25,634	$ 32,640	$ 17,060

Note 16 - Income Taxes - Summar

Note 16 - Income Taxes - Summary of Components of Income Tax Expense for Continuing Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Federal	$ 958	$ 174	$ (117)
State	1,342	(16)	99
Foreign	243	439	395
Total current income tax expense	2,543	597	377
Federal	4,380	3,597	(2,954)
State	(386)	561	(807)
Foreign	47	(17)	132
Total deferred income tax expense (benefit)	4,041	4,141	(3,629)
Total income tax expense (benefit)	$ 6,584	$ 4,738	$ (3,252)

Note 16 - Income Taxes - Effect

Note 16 - Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income tax expense at federal statutory rate	$ 5,383	$ 6,854	$ 3,583
State expense (benefit), net of federal income tax effect	953	1,261	(218)
Federal and state income tax credits	0	0	(7)
Change in valuation allowance	(181)	(3,564)	(2,618)
Tax windfall on share-based compensation	0	0	(369)
Bargain purchase gain	0	0	(4,228)
Nondeductible expenses	447	(24)	427
Foreign rate differential	78	36	77
Other	(96)	175	101
Total income tax expense (benefit)	$ 6,584	$ 4,738	$ (3,252)
Effective income tax rate	25.70%	14.50%	(19.10%)

Note 16 - Income Taxes - Summ_2

Note 16 - Income Taxes - Summary of Current and Noncurrent Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accrued employee benefits	$ 3,525	$ 3,089
Inventories	73	147
Trade receivable, net	958	788
Net operating loss carryforwards	3,231	5,391
Tax credit carryforwards	2,699	5,173
Other	389	509
Deferred tax assets, gross	10,875	15,097
Valuation allowance	(6,228)	(6,126)
Deferred tax assets, net	4,647	8,971
Contract assets, net	(1,366)	(1,703)
Property and equipment	(12,029)	(10,578)
Intangible assets	(2,737)	(226)
Prepaid expenses	(889)	(587)
Total deferred tax liabilities	(17,021)	(13,094)
Net deferred income tax liabilities	(12,374)	(4,123)
Deferred income taxes	(12,481)	(4,265)
Net deferred income tax liabilities	(12,374)	(4,123)
Other Assets [Member]
Deferred income tax assets, included in Other assets	$ 107	$ 142

Note 16 - Income Taxes - Summ_3

Note 16 - Income Taxes - Summary of Changes in Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Unrecognized income tax benefits, beginning of year	$ 4,350	$ 4,350	$ 4,116
Increases for positions taken in the current year	0	0	234
Unrecognized income tax benefits, end of year	$ 4,350	$ 4,350	$ 4,350

Note 17 - Accumulated Other C_3

Note 17 - Accumulated Other Comprehensive Loss - Summary of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Pension liability adjustment, net of income tax benefit of $679 and $671	$ (1,795)	$ (1,770)
Unrealized loss on cash flow hedges, net of income tax benefit of $20 and $11	(71)	(44)
Total	$ (1,866)	$ (1,814)

Note 17 - Accumulated Other C_4

Note 17 - Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Beginning balance	$ 248,158	$ 218,590	$ 200,264
Other comprehensive loss, net of tax	(52)	(43)	(91)
Ending balance	269,626	248,158	218,590
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Beginning balance	(1,770)
Other comprehensive loss before reclassifications	(3)
Amounts reclassified from Accumulated other comprehensive loss	(22)
Other comprehensive loss, net of tax	(25)
Ending balance	(1,795)	(1,770)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Beginning balance	(44)
Other comprehensive loss before reclassifications	(308)
Amounts reclassified from Accumulated other comprehensive loss	281
Other comprehensive loss, net of tax	(27)
Ending balance	(71)	(44)
AOCI Attributable to Parent [Member]
Beginning balance	(1,814)	(1,536)	(1,445)
Other comprehensive loss before reclassifications	(311)
Amounts reclassified from Accumulated other comprehensive loss	259
Other comprehensive loss, net of tax	(52)
Ending balance	$ (1,866)	$ (1,814)	$ (1,536)

Note 17 - Accumulated Other C_5

Note 17 - Accumulated Other Comprehensive Loss - Reclassification of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cost of sales	$ 235,388	$ 232,133	$ 160,053
Other income (loss)	953	4,383	267
Tax (expense) benefit	(6,584)	(4,738)	3,252
Net income	19,050	27,902	20,312
Revenue from Contract with Customer, Including Assessed Tax	285,907	279,317	172,149
Reclassification out of Accumulated Other Comprehensive Income [Member]
Net income	(259)	(15)	61
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Cost of sales	(16)	(11)	(11)
Other income (loss)	46	(15)	52
Tax (expense) benefit	(8)	4	8
Net income	22	(22)	49
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Tax (expense) benefit	97	2	(1)
Net income	(281)	7	12
Revenue from Contract with Customer, Including Assessed Tax	$ (378)	$ 5	$ 13

Note 18 - Restructuring (Detail

Note 18 - Restructuring (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Charges, Total	$ 0	$ 0	$ 1,364
Employee Severance [Member]
Restructuring Charges, Total			600
Demobilization Activities [Member]
Restructuring Charges, Total			$ 800

Schedule II - Valuation and Q_3

Schedule II - Valuation and Qualifying Accounts - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
Balance at Beginning of Period	$ 801	$ 660	$ 477
Charged to Profit and Loss	430	312	449
Deduction from Reserves	(464)	(171)	(266)
Balance at End of Period	767	801	660
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]
Balance at Beginning of Period	6,126	9,433	10,413
Charged to Profit and Loss	240	345	1,785
Deduction from Reserves	(138)	(3,652)	(2,765)
Balance at End of Period	$ 6,228	$ 6,126	$ 9,433