Aegion 10-K 10 Mar 21 2020 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2020	Mar. 03, 2021	Jun. 30, 2020
Document Information [Line Items]
Entity Central Index Key	0000353020
Entity Registrant Name	Aegion Corp
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	001-35328
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	45-3117900
Entity Address, Address Line One	17988 Edison Avenue
Entity Address, City or Town	Chesterfield
Entity Address, State or Province	MO
Entity Address, Postal Zip Code	63005-1195
City Area Code	636
Local Phone Number	530-8000
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Title of 12(b) Security	Class A Common Shares, $.01 par value
Trading Symbol	AEGN
Security Exchange Name	NASDAQ
Entity Public Float			$ 478,089,812
Entity Common Stock, Shares Outstanding		30,740,140

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues	[1]	$ 807,764	$ 885,887	$ 997,861
Cost of revenues		611,305	680,886	772,482
Gross profit	[1]	196,459	205,001	225,379
Operating expenses		147,523	168,778	188,148
Goodwill impairment		0	0	1,389
Definite-lived intangible asset impairment		0	0	2,169
Impairment of assets held for sale		172	23,427	0
Acquisition and divestiture expenses		3,614	3,375	7,004
Restructuring and related charges		4,162	8,188	6,660
Operating income	[1]	40,988	1,233	20,009
Other income (expense):
Interest expense	[2]	(12,483)	(11,358)	(14,709)
Interest income		1,125	1,038	516
Other	[3]	437	(10,893)	(9,881)
Total other expense		(10,921)	(21,213)	(24,074)
Income (loss) before taxes (benefit)		30,067	(19,980)	(4,065)
Taxes (benefit) on income (loss)		5,267	4,010	(1,293)
Income (loss) from continuing operations		24,800	(23,990)	(2,772)
Income (loss) from discontinued operations		(55,156)	4,542	5,859
Net income (loss)		(30,356)	(19,448)	3,087
Non-controlling interests income		(1,505)	(1,444)	(159)
Net income (loss) attributable to Aegion Corporation		$ (31,861)	$ (20,892)	$ 2,928
Basic:
Income (loss) from continuing operations (in dollars per share)		$ 0.76	$ (0.82)	$ (0.09)
Income (loss) from discontinued operations (in dollars per share)		(1.80)	0.15	0.18
Net income (loss) (in dollars per share)		(1.04)	(0.67)	0.09
Diluted:
Income (loss) from continuing operations (in dollars per share)		0.75	(0.82)	(0.09)
Income (loss) from discontinued operations (in dollars per share)		(1.77)	0.15	0.18
Net income (loss) (in dollars per share)		$ (1.02)	$ (0.67)	$ 0.09
[1]	Attributed to the country of origin.
[2]	Interest expense for 2020 includes $0.7 million of third-party arranging fees, expenses and the write-off of unamortized loan costs associated with the amended Credit Facility (see Note 9). Interest expense for 2018 includes $2.3 million of third-party arranging fees, expenses and the write-off of unamortized loan costs associated with the amended Credit Facility (see Note 9).
[3]	Other expense for 2020 includes gains of $0.9 million related to restructuring (see Note 4). Other expense for 2019 includes $10.2 million of restructuring charges (see Note 4). Other expense for 2018 includes charges of $7.0 million related to the loss on the sale of Bayou (see Note 1) and $4.0 million of restructuring charges (see Note 4).

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net income (loss)		$ (30,356)	$ (19,448)	$ 3,087
Other comprehensive income (loss):
Currency translation adjustments		7,432	13,915	(14,651)
Deferred loss on hedging activity, net of tax (1)	[1]	(4,496)	(6,237)	(1,621)
Pension activity, net of tax (2)	[2]	(138)	(33)	(654)
Total comprehensive loss		(27,558)	(11,803)	(13,839)
Comprehensive income attributable to non-controlling interests		(1,456)	(1,493)	(1)
Comprehensive loss attributable to Aegion Corporation		$ (29,014)	$ (13,296)	$ (13,840)
[1]	Amounts presented net of tax of $0, $164 and $(48) for the years ended December 31, 2020, 2019 and 2018, respectively.
[2]	Amounts presented net of tax of $(33), $8 and $(134) for the years ended December 31, 2020, 2019 and 2018, respectively.

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Loss) (Parentheticals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Deferred gain (loss) on hedging activity, tax	$ 0	$ 164	$ (48)
Pension activity, tax	$ (33)	$ 8	$ (134)

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020		Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 94,848		$ 64,874
Restricted cash	765		1,348
Receivables, net of allowances of $4,004 and $6,404, respectively	133,394		153,484
Retainage	32,807		33,103
Contract assets	44,026	[1]	42,973	[2]
Inventories	44,889		57,193
Prepaid expenses and other current assets	33,675		31,329
Assets held for sale	92,850		168,799
Total current assets	477,254		553,103
Property, plant & equipment, less accumulated depreciation	92,900		94,886
Other assets
Goodwill	210,665		208,858
Intangible assets, less accumulated amortization	58,869		67,875
Operating lease assets	52,421	[3]	60,246	[4]
Deferred income tax assets	448		1,216
Other non-current assets	8,890		9,329
Total other assets	331,293		347,524
Total Assets	901,447		995,513
Current liabilities
Accounts payable	51,469		54,100
Accrued expenses	59,664		67,852
Operating lease liabilities	14,147		14,204
Contract liabilities	37,569	[1]	37,517	[2]
Current maturities of long-term debt	25,811		32,803
Liabilities held for sale	36,148		37,900
Total current liabilities	224,808		244,376
Long-term debt, less current maturities	193,988		243,629
Other liabilities
Operating lease liabilities	38,724		46,059
Deferred income tax liabilities	10,344		11,254
Other non-current liabilities	25,218		15,102
Total other liabilities	74,286		72,415
Total liabilities	493,082		560,420
(See Commitments and Contingencies: Note 13)
Equity
Preferred stock, undesignated, $.10 par – shares authorized 2,000,000; none outstanding	0		0
Common stock, $.01 par – shares authorized 125,000,000; shares issued and outstanding 30,640,150 and 30,715,959, respectively	306		307
Additional paid-in capital	102,001		101,148
Retained earnings	327,137		358,998
Accumulated other comprehensive loss	(29,847)		(32,694)
Total stockholders’ equity	399,597		427,759
Non-controlling interests	8,768		7,334
Total equity	408,365		435,093
Total Liabilities and Equity	$ 901,447		$ 995,513
[1]	Amounts exclude contract assets of $9.3 million and contract liabilities of $0.2 million that were classified as held for sale at December 31, 2020 (see Note 6).
[2]	Amounts exclude contract assets of $13.5 million and contract liabilities of less than $0.2 million that were classified as held for sale at December 31, 2019 (see Note 6).
[3]	Amounts exclude operating lease assets of $8.7 million, accrued expenses of $2.3 million and other liabilities of $7.3 million that were classified as held for sale at December 31, 2020 (see Note 5).
[4]	Amounts exclude operating lease assets of $11.5 million, accrued expenses of $1.8 million and other liabilities of $10.4 million that were classified as held for sale at December 31, 2019 (see Note 5).

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Allowance for doubtful accounts receivable	$ 4,004	$ 6,404
Preferred stock, undesignated, par value (in dollars per share)	$ 0.10	$ 0.10
Preferred stock, undesignated, shares authorized (in shares)	2,000,000	2,000,000
Preferred stock, undesignated, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	125,000,000	125,000,000
Common stock, shares issued (in shares)	30,640,150	30,715,959
Common stock, shares outstanding (in shares)	30,640,150	30,715,959

Consolidated Statements of Equi

Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Restricted Stock Units (RSUs) [Member]	Performance Shares [Member]	Common Stock [Member]	Common Stock [Member]Restricted Stock Units (RSUs) [Member]	Common Stock [Member]Performance Shares [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member]Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]
Balance, beginning of year (in shares) at Dec. 31, 2017					32,462,542
Issuance of common stock upon stock option exercises (in shares)	0				0
Issuance of shares pursuant to restricted stock units (in shares)						312,182	296,909
Issuance of shares pursuant to deferred stock units (in shares)					28,308
Shares repurchased and retired (in shares)					(1,177,532)
Balance, end of year (in shares) at Dec. 31, 2018					31,922,409
Balance, beginning of year at Dec. 31, 2017	$ 505,056	$ 268			$ 325			$ 140,749	$ 376,694	$ 268	$ (23,522)	$ 10,810
Issuance of common stock upon stock option exercises	0				0			0
Issuance of shares pursuant to restricted stock units			$ 3	$ 3		$ 3	$ 3
Issuance of shares pursuant to deferred stock units	0				0
Shares repurchased and retired	(25,781)				(12)			(25,769)
Equity-based compensation expense	7,838							7,838
Net income (loss)	3,087								2,928			159
Currency translation adjustment, net	(16,926)										(16,768)	(158)
Investments from non-controlling interest	0											0
Distributions to non-controlling interests	0											0
Sale of non-controlling interests	(3,361)											(3,361)
Balance, end of year at Dec. 31, 2018	$ 470,187	0			$ 319			122,818	379,890	0	(40,290)	7,450
Issuance of common stock upon stock option exercises (in shares)					52,783
Issuance of shares pursuant to restricted stock units (in shares)						237,416	111,158
Issuance of shares pursuant to deferred stock units (in shares)					84,184
Shares repurchased and retired (in shares)					(1,691,991)
Balance, end of year (in shares) at Dec. 31, 2019	30,715,959				30,715,959
Issuance of common stock upon stock option exercises	$ 956				$ 1			955
Issuance of shares pursuant to restricted stock units			2	1		$ 2	$ 1
Issuance of shares pursuant to deferred stock units	1				1
Shares repurchased and retired	(30,393)				(17)			(30,376)
Equity-based compensation expense	7,751							7,751
Net income (loss)	(19,448)								(20,892)			1,444
Currency translation adjustment, net	7,645										7,596	49
Investments from non-controlling interest	0											0
Distributions to non-controlling interests	(1,609)											(1,609)
Sale of non-controlling interests	0											0
Balance, end of year at Dec. 31, 2019	$ 435,093	$ 0			$ 307			101,148	358,998	$ 0	(32,694)	7,334
Issuance of common stock upon stock option exercises (in shares)	52,783				0
Issuance of shares pursuant to restricted stock units (in shares)						297,322	71,541
Issuance of shares pursuant to deferred stock units (in shares)					59,297
Shares repurchased and retired (in shares)					(503,969)
Balance, end of year (in shares) at Dec. 31, 2020	30,640,150				30,640,150
Issuance of common stock upon stock option exercises	$ 0				$ 0			0
Issuance of shares pursuant to restricted stock units			$ 3	$ 1		$ 3	$ 1
Issuance of shares pursuant to deferred stock units	0				0
Shares repurchased and retired	(9,071)				(5)			(9,066)
Equity-based compensation expense	9,919							9,919
Net income (loss)	(30,356)								(31,861)			1,505
Currency translation adjustment, net	2,798										2,847	(49)
Investments from non-controlling interest	131											131
Distributions to non-controlling interests	(153)											(153)
Sale of non-controlling interests	0											0
Balance, end of year at Dec. 31, 2020	$ 408,365				$ 306			$ 102,001	$ 327,137		$ (29,847)	$ 8,768

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 (loss)		$ (30,356)	$ (19,448)	$ 3,087
(Income) loss from discontinued operations		55,156	(4,542)	(5,859)
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest, Total		24,800	(23,990)	(2,772)
Adjustments to reconcile to net cash provided by operating activities:
Depreciation and amortization	[1]	28,702	28,673	30,744
(Gain) loss on sale of fixed assets		(349)	(662)	177
Equity-based compensation expense		9,919	7,751	7,838
Deferred income taxes		(1,001)	3,146	(648)
Non-cash restructuring charges		1,202	12,717	13,814
Goodwill impairment		0	0	1,389
Definite-lived intangible asset impairment		0	0	2,169
Impairment of assets held for sale		1,259	23,427	0
(Gain) loss on sale of businesses		(14)	0	7,048
Loss on foreign currency transactions		844	503	623
Other		457	(744)	733
Changes in operating assets and liabilities:
Receivables net, retainage and contract assets		22,454	7,549	8,202
Inventories		9,999	(3,413)	2,306
Prepaid expenses and other assets		(2,481)	4,642	1,866
Accounts payable, accrued expenses and operating lease liabilities		(10,313)	(5,755)	(6,324)
Contract liabilities		(289)	5,302	(22,728)
Other operating		6,997	763	290
Net cash provided by operating activities of continuing operations		92,186	59,909	44,727
Net cash provided by (used in) operating activities of discontinued operations		18,529	18,905	(5,058)
Net cash provided by operating activities		110,715	78,814	39,669
Cash flows from investing activities:
Capital expenditures	[2]	(16,559)	(25,335)	(27,461)
Proceeds from sale of fixed assets		1,565	1,332	3,014
Patent expenditures		(299)	(293)	(299)
Sale of businesses, net of cash disposed		3,602	0	37,942
Other acquisition activity		0	0	(6,000)
Net cash provided by (used in) investing activities of continuing operations		(11,691)	(24,296)	7,196
Net cash used in investing activities of discontinued operations		(2,972)	(3,430)	(6,031)
Net cash provided by (used in) investing activities		(14,663)	(27,726)	1,165
Cash flows from financing activities:
Proceeds from issuance of common stock upon stock option exercises		0	956	0
Repurchase of common stock		(9,071)	(30,393)	(25,775)
Investments from non-controlling interest		131	0	0
Distributions to non-controlling interests		(153)	(1,609)	0
Credit facility amendment fees		(1,995)	0	(1,657)
Proceeds from (payments on) notes payable, net		0	(273)	234
Payments on line of credit, net		(24,000)	(7,000)	(7,000)
Principal payments on long-term debt		(32,033)	(28,438)	(26,250)
Net cash used in financing activities		(67,121)	(66,757)	(60,448)
Effect of exchange rate changes on cash		460	(2,995)	(4,045)
Net increase (decrease) in cash, cash equivalents and restricted cash for the year		29,391	(18,664)	(23,659)
Cash, cash equivalents and restricted cash, beginning of year		66,222	84,886	108,545
Cash, cash equivalents and restricted cash, end of year		95,613	66,222	84,886
Supplemental disclosures of cash flow information:
Interest		11,822	14,977	15,622
Income taxes, net of refunds		$ 2,047	$ (1,579)	$ 4,625
[1]	Depreciation and amortization from our discontinued operations were $6.8 million, $7.5 million and $7.1 million in 2020, 2019 and 2018, respectively.
[2]	Capital expenditures from our discontinued operations were $3.0 million, $3.4 million and $3.1 million in 2020, 2019 and 2018, respectively.

Note 1 - Description of Busines

Note 1 - Description of Business	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	1. Aegion Corporation combines innovative technologies with market leading expertise to maintain, rehabilitate and strengthen pipelines and other infrastructure around the world. For 50 ® The Company is primarily built on the premise that it is possible to use technology to extend the structural design life and maintain, if not The Company’s predecessor was originally incorporated in Delaware in 1980 ® 1971. ® first 50 In order to strengthen the Company’s ability to service the emerging demands of the infrastructure protection market and to better position the Company for sustainable growth, the Company embarked on a diversification strategy in 2009 Recognizing that the breadth of offerings expanded beyond the Company’s flagship Insituform ® 2011, October 2011. Strategic Initiatives/Acquisitions/Divestitures Pending Merger On February 16, 2021, no second 2021, 1976 Discontinued Operations In December 2020, December 31, 2020, 2019 2018. December 31, 2020 2019. 6. Restructuring Activities In 2017, 4. Infrastructure Solutions Segment (“Infrastructure Solutions”) In February 2020, five five December 31, 2019. 6. In January 2020, five five December 31, 2019. 6. During 2019, December 31, 2020 2019. 19 second 2021. 6. In October 2019, five In November 2018, five ® ® five Corrosion Protection Segment (“Corrosion Protection”) In October 2019, fifty-five ® forty-five In August 2018, fifty-one two 2020, March 2021. 2018, In May 2018, fifty fifty-one

Note 2 - Accounting Policies

Note 2 - Accounting Policies	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Significant Accounting Policies [Text Block]	2. Principles of Consolidation The consolidated financial statements include the accounts of the Company, its wholly-owned subsidiaries and majority-owned subsidiaries in which the Company is deemed to be the primary beneficiary. All significant intercompany transactions and balances have been eliminated. Accounting Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Accumulated Other Comprehensive Loss As set forth below, the Company’s accumulated other comprehensive loss is comprised of three December 31, 2020 2019 Currency translation adjustments (1) $ (19,760 ) $ (27,241 ) Derivative hedging activity (9,018 ) (4,522 ) Pension activity (1,069 ) (931 ) Total accumulated other comprehensive loss $ (29,847 ) $ (32,694 ) ( 1 During 2020 2019, $0.3 million and $10.9 For the Company’s international subsidiaries, the local currency is generally the functional currency. Assets and liabilities of these subsidiaries are translated into U.S. dollars using rates in effect at the balance sheet date while revenues and expenses are translated into U.S. dollars using average exchange rates. The cumulative translation adjustment resulting from changes in exchange rates are included in the Consolidated Balance Sheets as a component of “Accumulated other comprehensive loss” in total stockholders’ equity. Net foreign exchange transaction losses of $0.8 million, $0.5 million and $0.6 million for 2020, 2019 2018, Research and Development The Company expenses research and development costs as incurred. Research and development costs of $4.9 million, $6.4 million and $5.6 million for 2020, 2019 2018, Taxation The Company provides for estimated income taxes payable or refundable on current year income tax returns as well as the estimated future tax effects attributable to temporary differences and carryforwards, based upon enacted tax laws and tax rates, and in accordance with FASB ASC 740, Income Taxes 740” 740 not not may In accordance with FASB ASC 740, may not 50% 740. The Company recognizes tax liabilities in accordance with FASB ASC 740 not may December 31, 2019 2018 740, Earnings per Share Earnings per share have been calculated using the following share information: Years Ended December 31, 2020 2019 2018 Weighted average number of common shares used for basic EPS 30,731,882 31,130,222 32,345,382 Effect of dilutive stock options and restricted and deferred stock unit awards 509,253 — — Weighted average number of common shares and dilutive potential common stock used for dilutive EPS 31,241,135 31,130,222 32,345,382 The Company excluded 529,539 and 652,621 restricted and deferred stock units in 2019 2018, 2018 Purchase Price Accounting The Company accounts for its acquisitions in accordance with FASB ASC 805, Business Combinations The Company typically determines the fair value of tangible and intangible assets acquired in a business combination using independent valuations that rely on management’s estimates of inputs and assumptions that a market participant would use. Key assumptions include cash flow projections, growth rates, asset lives, and discount rates based on an analysis of weighted average cost of capital. Classification of Current Assets and Current Liabilities The Company includes in current assets and current liabilities certain amounts realizable and payable under construction contracts that may one one Cash, Cash Equivalents and Restricted Cash The Company classifies highly liquid investments with original maturities of 90 Cash, cash equivalents and restricted cash reported within the Consolidated Balance Sheets and Consolidated Statements of Cash Flows are as follows (in thousands): December 31, Balance sheet data 2020 2019 Cash and cash equivalents $ 94,848 $ 64,874 Restricted cash 765 1,348 Cash, cash equivalents and restricted cash $ 95,613 $ 66,222 Restricted cash held in escrow primarily relates to funds reserved for legal requirements, deposits made in lieu of retention on specific projects performed for municipalities and state agencies, or advance customer payments and compensating balances for bank undertakings in Europe. Restricted cash related to operations is similar to retainage, and is, therefore, classified as a current asset, consistent with the Company’s policy on retainage. Inventories Inventories are stated at the lower of cost ( first first Retainage Many of the contracts under which the Company performs work contain retainage provisions. Retainage refers to that portion of revenue earned by the Company but held for payment by the customer pending satisfactory completion of the project. The Company generally invoices its customers periodically as work is completed. Under ordinary circumstances, collection from municipalities is made within 60 to 90 days of billing. In most cases, 5% to 15% of the contract value is withheld by the municipal owner pending satisfactory completion of the project. Collections from other customers are generally made within 30 to 45 days of billing. Unless reserved, the Company believes that all amounts retained by customers under such provisions are fully collectible. Retainage on active contracts is classified as a current asset regardless of the term of the contract. Retainage is generally collected within one one December 31, 2020 365 Credit Losses The Company is exposed to credit losses primarily through sales of products and services. The Company’s expected loss allowance methodology for accounts receivable, including retainage, is developed using historical collection experience, current and future economic and market conditions and a review of the current status of customers’ trade accounts receivables. Due to the short-term nature of such receivables, the estimate of amount of accounts receivable that may not Long-Lived Assets Property, plant and equipment and other identified intangibles (primarily customer relationships, patents and acquired technologies, trademarks, licenses and non-compete agreements) are recorded at cost, net of accumulated depreciation, amortization and impairment, and, except for goodwill, are depreciated or amortized on a straight-line basis over their estimated useful lives. Changes in circumstances such as technological advances, changes to the Company’s business model or changes in the Company’s capital strategy can result in the actual useful lives differing from the Company’s estimates. If the Company determines that the useful life of its property, plant and equipment or its identified intangible assets should be shortened, the Company would depreciate or amortize the net book value in excess of the salvage value over its revised remaining useful life, thereby increasing depreciation or amortization expense. Long-lived assets, including property, plant and equipment and other intangibles, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying value of an asset may not may Impairment Review – Third Quarter 2020 The oil and gas industry experienced an unprecedented disruption during 2020 19 third 2020 2020 2021. 360, Property, Plant and Equipment 360” The assets of an asset group represent the lowest level for which identifiable cash flows can be determined independent of other groups of assets and liabilities. The Energy Services asset group was the only at-risk asset group reviewed for impairment. The Company developed internal forward business plans under the guidance of local and regional leadership to determine the undiscounted expected future cash flows derived from Energy Services’ long-lived assets. Such were based on management’s best estimates considering the likelihood of various outcomes. Based on the internal projections, the Company determined that the sum of the undiscounted expected future cash flows for the Energy Services asset group exceeded the carrying value of the assets and no Impairment Review – Fourth Quarter 2020 In December 2020, 360 no The fair value estimates described above were determined using similar inputs as the fourth 2020 Goodwill Under FASB ASC 350, Goodwill and Other 350” may not not • significant underperformance of a segment relative to expected, historical or forecasted operating results; • significant negative industry or economic trends; • significant changes in the strategy for a segment including extended slowdowns in the segment’s market; • a decrease in market capitalization below the Company’s book value; and • a significant change in regulations. Whether during the annual impairment assessment or during a trigger-based impairment review, the Company estimates the fair value of its reporting units and compares such fair value to the carrying value of those reporting units to determine if there are any indications of goodwill impairment. Fair value of reporting units is estimated using a combination of two two The market approach estimates fair value by first The income approach is based on forecasted future (debt-free) cash flows that are discounted to present value using factors that consider timing and risk of future cash flows. The Company believes this approach is appropriate because it provides a fair value estimate based upon the reporting unit’s expected long-term operating cash flow performance. Discounted cash flow projections are based on financial forecasts developed from operating plans and economic outlooks, revenue growth rates, EBITDA growth, estimates of future expected changes in operating margins, terminal value growth rates, future capital expenditures and changes in working capital requirements. Estimates of discounted cash flows may The discount rate applied to the estimated future cash flows is one twenty may Impairment Review – Third Quarter 2020 Given the prolonged uncertainty in the oil and gas markets and the market assessment of the Energy Services reporting unit discussed above, the Company evaluated the goodwill of its Energy Services reporting unit during the third 2020 third 350, Significant assumptions used in the Company’s goodwill review included discount rate, revenue growth rates, operating margins, EBITDA growth, terminal value growth rate and peer group EBITDA multiples. The values derived from both the income approach and the market approach decreased from the October 1, 2019 October 1, 2019 twenty 3.2%, October 1, 2019 2020 2021. 100 Based on the impairment analysis, the Company determined that recorded goodwill at the Energy Services reporting unit was impaired by $39.4 million, which was recorded to “Goodwill impairment” in the Consolidated Statement of Operations during the third 2020. September 30, 2020, 6 fourth 2020. Annual Impairment Assessment – October 1, 2020 The Company had six October 1, 2020 Significant assumptions used in the Company’s October 2020 15.7%; 2.2% 8.9%; 19 The Company’s assessment of each reporting unit’s fair value in relation to its respective carrying value yielded: (i) no one 10 one 15 10 third 2020. 15 2020, 19 2021 2022, not Impairment Review – Fourth Quarter 2020 In December 2020, 6. Fair Value Measurements FASB ASC 820, Fair Value Measurements 820” three • Level 1 • Level 2 • Level 3 no The Company uses these levels of hierarchy to measure the fair value of certain financial instruments on a recurring basis, such as for derivative instruments; on a non-recurring basis, such as for acquisitions and impairment testing; for disclosure purposes, such as for long-term debt; and for other applications, as discussed in their respective footnotes. Changes in assumptions or estimation methods could affect the fair value estimates. Other financial instruments including notes payable are recorded at cost, which approximates fair value, and is based on Level 2 no 1, 2 3 2020, 2019 2018. Investments in Variable Interest Entities The Company evaluates all transactions and relationships with variable interest entities (“VIE”) to determine whether the Company is the primary beneficiary of the entities in accordance with FASB ASC 810, Consolidation. no 2020. Financial data for consolidated variable interest entities are summarized in the following tables (in thousands): December 31, Balance sheet data 2020 2019 Current assets $ 24,876 $ 18,304 Non-current assets 7,513 7,635 Current liabilities 10,932 8,261 Non-current liabilities 3,279 1,962 Years Ended December 31, Statement of operations data 2020 2019 (1) 2018(1)(2) Revenue $ 31,930 $ 28,403 $ 49,809 Gross profit 10,862 9,508 9,898 Net (income) loss attributable to Aegion Corporation 1,209 (1,100 ) (1,374 ) ( 1 Includes activity from our Tite Liner ® fourth 2019. ( 2 Includes activity from our pipe coating and insulation joint venture in Louisiana, which was sold during the third 2018. Accounting Standards Updates In March 2020, No. 2020 04, Reference Rate Reform (Topic 848 December 31, 2022. not In December 2019, No. 2019 12, Simplifying the Accounting for Income Taxes 740 January 1, 2021, January 1, 2020, not In August 2018, No. 2018 13, Fair Value Measurement: Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement 1, 2 3 January 1, 2020, January 1, 2020, not In June 2016, No. 2016 13, Measurement of Credit Losses on Financial Instruments January 1, 2020, January 1, 2020, not

Note 3 - Revenues

Note 3 - Revenues	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Revenue from Contract with Customer [Text Block]	3. On January 1, 2018, 606, Revenue from Contracts with Customers 606” not January 1, 2018 606, Performance Obligations A performance obligation is a promise in a contract to transfer a distinct good or service to the customer, and is the unit of account in FASB ASC 606. not not not The Company’s performance obligations are satisfied over time as work progresses or at a point in time. Revenues from products and services transferred to customers over time accounted for 90.2%, 89.4% and 91.3% of revenues for the years ended December 31, 2020, 2019 2018 606 55 255, not December 31, 2020, 2019 2018 On December 31, 2020 December 31, 2020 Contract Estimates Accounting for long-term contracts involves the use of various techniques to estimate total contract revenue and costs. For long-term contracts, the Company estimates the profit on a contract as the difference between the total estimated revenue and expected costs to complete a contract, and recognizes that profit over the life of the contract. Contract estimates are based on various assumptions to project the outcome of future events that sometimes span multiple years. These assumptions include labor productivity and availability; the complexity of the work to be performed; the cost and availability of materials; the performance of subcontractors; and the availability and timing of funding from the customer. The Company’s contracts do not not not not The Company’s estimates of variable consideration and determination of whether to include estimated amounts in the transaction price are based largely on an assessment of anticipated performance and all information (historical, current and forecasted) that is reasonably available. Revenue by Category The following tables summarize revenues by segment and geography (in thousands): Year Ended December 31, 2020 Infrastructure Solutions Corrosion Protection Total Geographic region: United States $ 443,196 $ 129,533 $ 572,729 Canada 69,190 49,063 118,253 Europe 23,782 13,469 37,251 Other foreign 26,403 53,128 79,531 Total revenues $ 562,571 $ 245,193 $ 807,764 Year Ended December 31, 2019 Infrastructure Solutions Corrosion Protection Total Geographic region: United States $ 427,220 $ 159,408 $ 586,628 Canada 65,370 57,663 123,033 Europe 49,157 15,121 64,278 Other foreign 49,050 62,898 111,948 Total revenues $ 590,797 $ 295,090 $ 885,887 Year Ended December 31, 2018 Infrastructure Solutions Corrosion Protection Total Geographic region: United States $ 430,187 $ 200,397 $ 630,584 Canada 62,292 71,320 133,612 Europe 54,567 12,227 66,794 Other foreign 57,075 109,796 166,871 Total revenues $ 604,121 $ 393,740 $ 997,861 The following tables summarize revenues by segment and contract type (in thousands): Year Ended December 31, 2020 Infrastructure Solutions Corrosion Protection Total Contract type: Fixed fee $ 513,187 $ 162,334 $ 675,521 Time and materials — 52,713 52,713 Product sales 49,353 30,146 79,499 License fees 31 — 31 Total revenues $ 562,571 $ 245,193 $ 807,764 Year Ended December 31, 2019 Infrastructure Solutions Corrosion Protection Total Contract type: Fixed fee $ 523,042 $ 203,887 $ 726,929 Time and materials — 65,084 65,084 Product sales 67,512 26,119 93,631 License fees 243 — 243 Total revenues $ 590,797 $ 295,090 $ 885,887 Year Ended December 31, 2018 Infrastructure Solutions Corrosion Protection Total Contract type: Fixed fee $ 556,642 $ 296,217 $ 852,859 Time and materials — 58,372 58,372 Product sales 45,030 39,151 84,181 License fees 2,449 — 2,449 Total revenues $ 604,121 $ 393,740 $ 997,861 Contract Balances The timing of revenue recognition, billings and cash collections results in billed accounts receivable, contract assets and contract liabilities on the Consolidated Balance Sheets. Contract assets represent work performed that could not not one For fixed fee and time-and-materials based contracts, amounts are billed as work progresses in accordance with agreed-upon contractual terms, either at periodic intervals or upon achievement of contractual milestones. Generally, billing occurs subsequent to revenue recognition, resulting in contract assets. For some royalty license arrangements, minimum amounts are billed over the license term as quarterly royalty amounts are determined. This results in contract assets as the Company recognizes revenue for the license when the license is transferred to the customer at contract inception. The Company’s contract liabilities consist of advance payments, billings in excess of revenue recognized and deferred revenue. The Company’s contract assets and contract liabilities are reported in a net position on a contract-by-contract basis at the end of each reporting period. Advance payments, billings in excess of revenue recognized and deferred revenue are each classified as current. Net contract assets (liabilities) consisted of the following (in thousands): December 31, 2020 (1) 2019 (2) Contract assets – current $ 44,026 $ 42,973 Contract liabilities – current (37,569 ) (37,517 ) Net contract assets $ 6,457 $ 5,456 ( 1 Amounts exclude contract assets of $9.3 million and contract liabilities of $0.2 million that were classified as held for sale at December 31, 2020 6 ( 2 Amounts exclude contract assets of $13.5 million and contract liabilities of less than $0.2 million that were classified as held for sale at December 31, 2019 6 Included in the change of total net contract assets was a $1.1 million increase in contract assets, primarily related to the timing between work performed on open contracts and contractual billing terms, and a $0.1 million increase in contract liabilities, primarily related to the timing of customer advances on certain contracts. Substantially all of the $37.5 million and $32.3 million contract liabilities balances at December 31, 2019 December 31, 2018, 2020 2019 Impairment losses recognized on receivables and contract assets were not 2020 2019 2018

Note 4 - Restructuring

Note 4 - Restructuring	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Restructuring, Impairment, and Other Activities Disclosure [Text Block]	4. On July 28, 2017, ® During 2018 2019, ® ® ® The Company completed the divestitures of Bayou and the Denmark CIPP business in 2018. ® 2019, 2020 1 first 2021. first 2021 19, second 2021. As part of efforts to optimize the cathodic protection operations in North America, management initiated plans during the fourth 2019 three four 2019. 2019, Although not 2020, 19. P2S “P2S” Total pre-tax restructuring and related impairment charges since the Restructuring’s inception were $188.7 million ($171.6 million post-tax) and consisted of cash charges totaling $57.3 million and non-cash charges totaling $131.4 million. Cash charges included employee severance, retention, extension of benefits, employment assistance programs, early lease and contract termination costs and other restructuring charges associated with the restructuring efforts described above. Non-cash charges included (i) $86.4 million related to goodwill and long-lived asset impairment charges recorded in 2017 The Company continues to monitor the impact COVID- 19 may 2021 During 2020 2019 2018 Year Ended December 31, 2020 Infrastructure Solutions Corrosion Protection Corporate Continuing Operations Discontinued Operations Total Severance and benefit related costs $ 29 $ 3,673 $ 324 $ 4,026 $ 571 $ 4,597 Contract termination costs 66 (166 ) — (100 ) 199 99 Relocation and other moving costs 99 137 — 236 34 270 Other restructuring costs (1) (1,626 ) 5,864 2,879 7,117 4,654 11,771 Total pre-tax restructuring charges $ (1,432 ) $ 9,508 $ 3,203 $ 11,279 $ 5,458 $ 16,737 ( 1 Includes charges primarily related to certain wind-down costs, allowances for accounts receivable, fixed asset disposals, release of cumulative currency translation adjustments and other restructuring-related costs in connection with optimizing the cathodic protection operations in North America, exiting the CIPP operations in Europe, disposing of certain international businesses and other cost savings initiatives. Amounts also include goodwill and definite-lived intangible asset impairments related to exiting a small business in discontinued operations. Year Ended December 31, 2019 Infrastructure Solutions Corrosion Protection Corporate Continuing Operations Discontinued Operations Total Severance and benefit related costs $ 938 $ 3,179 $ 1,685 $ 5,802 $ 553 $ 6,355 Contract termination costs 601 1,089 98 1,788 234 2,022 Relocation and other moving costs 190 408 — 598 55 653 Other restructuring costs (1) 13,642 4,592 4,258 22,492 819 23,311 Total pre-tax restructuring charges $ 15,371 $ 9,268 $ 6,041 $ 30,680 $ 1,661 $ 32,341 ( 1 Includes charges primarily related to certain wind-down costs, inventory obsolescence, fixed asset disposals, release of cumulative currency translation adjustments and other restructuring-related costs in connection with exiting or divesting the CIPP operations in Europe and Australia, exiting the cathodic protection operations in the Middle East and right-sizing the cathodic protection services operation in North America. Year Ended December 31, 2018 Infrastructure Solutions Corrosion Protection Corporate Continuing Operations Discontinued Operations Total Severance and benefit related costs $ 3,038 $ 1,094 $ 170 $ 4,302 $ 234 $ 4,536 Contract termination costs 1,999 25 150 2,174 — 2,174 Relocation and other moving costs 184 — — 184 — 184 Other restructuring costs (1) 13,311 7,936 1,317 22,564 28 22,592 Total pre-tax restructuring charges $ 18,532 $ 9,055 $ 1,637 $ 29,224 $ 262 $ 29,486 ( 1 Includes charges primarily related to certain wind-down costs, allowances for accounts receivable, fixed asset disposals and other restructuring-related costs in connection with exiting non-pipe-related contract applications for the Tyfo ® Restructuring costs from continuing operations that were related to severance, other termination benefit costs and early contract termination costs were $4.2 million, $8.2 million and $6.7 million in 2020, 2019 2018, The following tables summarize restructuring charges recognized in 2020 2019 2018 Year Ended December 31, 2020 Infrastructure Solutions Corrosion Protection Corporate Continuing Operations Discontinued Operations Total (1) Cost of revenues $ 69 $ 1,952 $ — $ 2,021 $ — $ 2,021 Operating expenses (357 ) 3,947 2,360 5,950 — 5,950 Restructuring and related charges 194 3,644 324 4,162 — 4,162 Other expense (2) (1,338 ) (35 ) 519 (854 ) — (854 ) Loss from discontinued operations — — — — 5,458 5,458 Total pre-tax restructuring charges $ (1,432 ) $ 9,508 $ 3,203 $ 11,279 $ 5,458 $ 16,737 ( 1 Total pre-tax restructuring charges include cash charges of $12.0 million and non-cash charges of $4.7 million. Cash charges consist of charges incurred during the year that will be settled in cash, either during the current period or future periods. ( 2 Includes charges related to the (gain) loss on disposal of restructured entities, including the release of cumulative currency translation adjustments resulting from those disposals. Year Ended December 31, 2019 Infrastructure Solutions Corrosion Protection Corporate Continuing Operations Discontinued Operations Total (1) Cost of revenues $ 469 $ 1,869 $ — $ 2,338 $ — $ 2,338 Operating expenses 5,349 1,131 3,444 9,924 — 9,924 Restructuring and related charges 1,729 4,676 1,783 8,188 — 8,188 Other expense (2) 7,824 1,592 814 10,230 — 10,230 Income from discontinued operations — — — — 1,661 1,661 Total pre-tax restructuring charges $ 15,371 $ 9,268 $ 6,041 $ 30,680 $ 1,661 $ 32,341 ( 1 Total pre-tax restructuring charges include cash charges of $19.5 million and non-cash charges of $12.8 million. Cash charges consist of charges incurred during the year that will be settled in cash, either during the current period or future periods. ( 2 Includes charges related to the loss on disposal of restructured entities, including the release of cumulative currency translation adjustments resulting from those disposals. Year Ended December 31, 2018 Infrastructure Solutions Corrosion Protection Corporate Continuing Operations Discontinued Operations Total (1) Cost of revenues $ 1,281 $ 600 $ — $ 1,881 $ — $ 1,881 Operating expenses 7,291 4,547 1,317 13,155 — 13,155 Goodwill impairment 1,389 — — 1,389 — 1,389 Definite-lived intangible asset impairment 870 1,299 — 2,169 — 2,169 Restructuring and related charges 5,221 1,119 320 6,660 — 6,660 Other expense (2) 2,480 1,490 — 3,970 — 3,970 Income from discontinued operations — — — — 262 262 Total pre-tax restructuring charges $ 18,532 $ 9,055 $ 1,637 $ 29,224 $ 262 $ 29,486 ( 1 Total pre-tax restructuring charges include cash charges of $12.1 million and non-cash charges of $17.4 million. Cash charges consist of charges incurred during the year that will be settled in cash, either during the current period or future periods. ( 2 Includes charges related to the loss on disposal of restructured entities, including the release of cumulative currency translation adjustments resulting from those disposals. The following tables summarize restructuring activity during 2020 2019 2018 Utilized in 2020 Reserves at December 31, 2019 2020 Charge to Income Foreign Currency Translation Cash(1) Non-Cash(2) Reserves at December 31, 2020 Severance and benefit related costs $ 4,389 $ 4,597 $ (30 ) $ 7,179 $ — $ 1,777 Contract termination costs 953 99 (7 ) 1,020 — 25 Relocation and other moving costs 367 270 1 515 — 123 Other restructuring costs 2,379 11,771 35 7,302 4,801 2,082 Total pre-tax restructuring charges $ 8,088 $ 16,737 $ (1 ) $ 16,016 $ 4,801 $ 4,007 Utilized in 2019 Reserves at December 31, 2018 2019 Charge to Income Foreign Currency Translation Cash(1) Non-Cash(2) Reserves at December 31, 2019 Severance and benefit related costs $ 1,742 $ 6,355 $ (11 ) $ 3,697 $ — $ 4,389 Contract termination costs 359 2,022 (20 ) 1,408 — 953 Relocation and other moving costs — 653 (3 ) 283 — 367 Other restructuring costs 311 23,311 (4 ) 8,457 12,782 2,379 Total pre-tax restructuring charges $ 2,412 $ 32,341 $ (38 ) $ 13,845 $ 12,782 $ 8,088 Utilized in 2018 Reserves at December 31, 2017 2018 Charge to Income Foreign Currency Translation Cash(1) Non-Cash(2) Reserves at December 31, 2018 Severance and benefit related costs $ 3,864 $ 4,536 $ (69 ) $ 6,589 $ — $ 1,742 Contract termination costs 650 2,174 (19 ) 2,446 — 359 Relocation and other moving costs — 184 — 184 — — Other restructuring costs 675 22,592 (3 ) 5,581 17,372 311 Total pre-tax restructuring charges $ 5,189 $ 29,486 $ (91 ) $ 14,800 $ 17,372 $ 2,412 ( 1 Refers to cash utilized to settle charges during the year. ( 2 Includes non-cash charges from discontinued operations of $3.6 million, $0.1 million and zero in 2020, 2019 2018,

Note 5 - Supplemental Balance S

Note 5 - Supplemental Balance Sheet Information	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Supplemental Balance Sheet Disclosures [Text Block]	5. Credit Losses Activity in the allowance for doubtful accounts is summarized as follows (in thousands): Years Ended December 31, 2020 2019 2018 Balance, beginning of year $ 6,404 $ 9,546 $ 5,428 Provision for expected credit losses, net of recoveries (1) 500 (1,930 ) 8,188 Amounts written off and adjustments (2,900 ) (1,212 ) (4,070 ) Balance, end of year $ 4,004 $ 6,404 $ 9,546 ( 1 The Company recorded bad debt expense (reversals) of $0.5 million, less than ($0.1) million and $5.3 million in 2020 2019 2018 4 Inventories Inventories are summarized as follows (in thousands): December 31, 2020(1) 2019 Raw materials and supplies $ 21,770 $ 27,415 Work-in-process 5,377 5,739 Finished products 8,413 14,937 Construction materials 9,329 9,102 Total $ 44,889 $ 57,193 Property, Plant and Equipment Property, plant and equipment consisted of the following (in thousands): Estimated Useful Lives December 31, (Years) 2020 2019 Land and land improvements $ 7,851 $ 6,703 Buildings and improvements 5 — 40 48,190 49,084 Machinery and equipment 4 — 10 139,844 131,956 Furniture and fixtures 3 — 10 31,188 31,860 Autos and trucks 3 — 10 45,768 45,496 Construction in progress 5,557 7,236 278,398 272,335 Less – Accumulated depreciation (185,498 ) (177,449 ) Property, plant & equipment, less accumulated depreciation $ 92,900 $ 94,886 Depreciation expense from continuing operations was $19.3 million, $19.3 million and $21.0 million for the years ended December 31, 2020, 2019 2018 Accrued Expenses Accrued expenses consisted of the following (in thousands): December 31, 2020 2019 Vendor and other accrued expenses $ 17,152 $ 26,313 Estimated casualty and healthcare liabilities 10,624 10,702 Job costs 13,416 12,041 Accrued compensation 17,112 17,045 Income taxes payable 1,360 1,751 Total $ 59,664 $ 67,852

Note 6 - Discontinued Operation

Note 6 - Discontinued Operations and Assets and Liabilities Held for Sale	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]	6. Discontinued Operations In December 2020, third no third 2020 2 third 2020 350, fourth 2020, 2021 In accordance with FASB ASC 205, Presentation of Financial Statements – Discontinued Operations 205” December 31, 2020, 2019 2018. Years Ended December 31, 2020 2019 2018 Revenues $ 271,529 $ 328,048 $ 335,707 Cost of revenues 247,453 286,814 294,160 Gross profit 24,076 41,234 41,547 Operating expenses 28,455 30,652 31,675 Goodwill impairment 47,977 — — Definite-lived intangible asset impairment 957 — — Restructuring and related charges 804 842 234 Operating income (loss) (54,117 ) 9,740 9,638 Other income (expense): Interest expense (1) (3,308 ) (2,644 ) (2,618 ) Total other expense (3,308 ) (2,644 ) (2,618 ) Income (loss) before taxes on income (57,425 ) 7,096 7,020 Taxes (benefit) on income (loss) (2,269 ) 2,554 1,161 Net income (loss) from discontinued operations $ (55,156 ) $ 4,542 $ 5,859 ( 1 The Company allocated interest expense, including a portion of the settlement amount from the Company's interest rate swaps, to its discontinued operations based on carrying value at December 31, 2020. Assets Held for Sale During 2018 2019, 2019, 1 first 2020, 1 19 third second 2021. 2019, 1 2019, 4. During 2019, 2019 2020, no 205. December 31, 2020 360, fourth 2020 During 2019, The relevant asset and liability balances at December 31, 2020 2019 205, December 31, 2020 2019. The following table provides the components of assets and liabilities held for sale (in thousands): December 31, 2020(1) 2019(2) Assets held for sale: Current assets Receivables, net $ 26,901 $ 43,256 Retainage 203 518 Contract assets 9,330 13,469 Inventories 60 2,097 Prepaid expenses and other current assets 2,652 3,379 Total current assets 39,146 62,719 Property, plant & equipment, less accumulated depreciation 7,962 17,167 Goodwill 2,640 52,201 Intangible assets, less accumulated amortization 33,718 38,481 Operating lease assets 8,734 11,546 Other non-current assets 650 663 Impairment of assets held for sale — (13,978 ) Total assets held for sale $ 92,850 $ 168,799 Liabilities held for sale: Current liabilities Accounts payable $ 5,211 $ 8,688 Accrued expenses 20,927 16,707 Operating lease liabilities 2,301 1,775 Contract liabilities 165 167 Total current liabilities 28,604 27,337 Operating lease liabilities 7,348 10,368 Other non-current liabilities 196 195 Total liabilities held for sale $ 36,148 $ 37,900 ( 1 Includes Energy Services and Environmental Techniques. ( 2 Includes Energy Services, Environmental Techniques, Insituform Australia, Insituform Spain and land held at Corporate.

Note 7 - Leases

Note 7 - Leases	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Lessee, Operating Leases [Text Block]	7. Effective January 1, 2019, 842 January 1, 2019 not not 842 January 1, 2019 No The Company’s operating lease portfolio includes operational field locations, administrative offices, equipment, vehicles and information technology equipment. The majority of the Company’s leases have remaining lease terms of 1 year to 20 years, some of which include options to extend the leases for 5 years or more. Right-of-use assets are presented within “Operating lease assets” on the Consolidated Balance Sheet. The current portion of operating lease liabilities are presented within “Accrued expenses”, and the non-current portion of operating lease liabilities are presented within “Operating lease liabilities” on the Consolidated Balance Sheet. Operating lease assets and liabilities are recognized based on the present value of lease payments over the lease term at inception. For purposes of calculating operating lease liabilities, lease terms may January 1, 2019 January 1, 2019. not The following table presents the components of lease expense (in thousands): Years Ended December 31, 2020 2019 Operating lease cost $ 19,750 $ 22,235 Short-term lease cost 24,607 25,382 Total lease cost $ 44,357 $ 47,617 Supplemental cash flow information related to leases was as follows (in thousands): Years Ended December 31, 2020 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 19,083 $ 22,144 Right-of-use assets obtained in exchange for lease obligations: Operating leases $ 7,708 $ 18,879 Supplemental balance sheet information related to leases was as follows (in thousands): December 31, 2020 (1) 2019 (2) Operating leases: Operating lease assets $ 52,421 $ 60,246 Current liabilities $ 14,147 $ 14,204 Other liabilities 38,724 46,059 Total operating lease liabilities $ 52,871 $ 60,263 Weighted-average remaining lease term (in years) 4.85 5.74 Weighted-average discount rate 4.96 % 5.71 % ( 1 Amounts exclude operating lease assets of $8.7 million, accrued expenses of $2.3 million and other liabilities of $7.3 million that were classified as held for sale at December 31, 2020 5 ( 2 Amounts exclude operating lease assets of $11.5 million, accrued expenses of $1.8 million and other liabilities of $10.4 million that were classified as held for sale at December 31, 2019 ( 5 Operating lease liabilities under non-cancellable leases were as follows (in thousands): December 31, 2020 2021 $ 16,380 2022 13,536 2023 10,784 2024 7,511 2025 4,415 Thereafter 6,965 Total undiscounted operating lease liabilities 59,591 Less: Imputed interest (6,720 ) Total discounted operating lease liabilities $ 52,871

Note 8 - Goodwill and Intangibl

Note 8 - Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Goodwill and Intangible Assets Disclosure [Text Block]	8. Goodwill The following table presents a reconciliation of the beginning and ending balances of goodwill (in thousands): Infrastructure Solutions Corrosion Protection Total Balance, December 31, 2018 Goodwill, gross $ 244,521 $ 76,383 $ 320,904 Accumulated impairment losses (62,848 ) (45,400 ) (108,248 ) Goodwill, net 181,673 30,983 212,656 2019 Activity: Foreign currency translation (137 ) 563 426 Reclassification to assets held for sale (1) (4,224 ) — (4,224 ) Balance, December 31, 2019 Goodwill, gross 240,160 76,946 317,106 Accumulated impairment losses (62,848 ) (45,400 ) (108,248 ) Goodwill, net 177,312 31,546 208,858 2020 Activity: Foreign currency translation 1,559 248 1,807 Balance, December 31, 2020 Goodwill, gross 241,719 77,194 318,913 Accumulated impairment losses (62,848 ) (45,400 ) (108,248 ) Goodwill, net $ 178,871 $ 31,794 $ 210,665 ( 1 During 2019, 6 Intangible Assets Intangible assets consisted of the following (in thousands): December 31, 2020 December 31, 2019 Weighted Average Useful Lives (Years) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount License agreements — $ 3,894 $ (3,894 ) $ — $ 3,894 $ (3,824 ) $ 70 Leases — 864 (864 ) — 864 (777 ) 87 Trademarks 8.4 14,758 (7,459 ) 7,299 14,688 (6,695 ) 7,993 Non-competes 2.3 1,561 (1,008 ) 553 1,556 (784 ) 772 Customer relationships 5.7 95,058 (56,602 ) 38,456 94,865 (50,104 ) 44,761 Patents and acquired technology 6.9 39,756 (27,195 ) 12,561 39,288 (25,096 ) 14,192 Total intangible assets — $ 155,891 $ (97,022 ) $ 58,869 $ 155,155 $ (87,280 ) $ 67,875 Amortization expense from continuing operations was $9.4 million, $9.4 million and $9.7 million for the years ended December 31, 2020, 2019 2018 December 31, 2021, 2022, 2023, 2024 2025

Note 9 - Long-term Debt and Cre

Note 9 - Long-term Debt and Credit Facility	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Debt Disclosure [Text Block]	9. Long-term debt consisted of the following (in thousands): December 31, 2020 2019 Term note, due February 27, 2023, annualized rates of 2.00 4.09 $ 221,717 $ 253,750 Line of credit, 2.00 4.01 — 24,000 Other notes with interest rates from 3.3 7.8 750 770 Subtotal 222,467 278,520 Less – Current maturities of long-term debt 25,811 32,803 Less – Unamortized loan costs 2,668 2,088 Total $ 193,988 $ 243,629 Required principal payments for each of the next five December 31, 2020 2021 $ 25,811 2022 30,844 2023 165,812 2024 — 2025 — Thereafter — Total $ 222,467 Financing Arrangements In October 2015, February 2018, December 2018, April 2020 November 2020, December 31, 2020, February 2023. In April 2020, 19 November 2020, 9. During 2020 third 2020. 2020. 2018, third 2018. 2018. Based on the 2020 December 31, 2020 The Company’s indebtedness at December 31, 2020 2020, As of December 31, 2020, The Company’s indebtedness at December 31, 2019 third 2019, At December 31, 2020 2019, 3 2. In October 2015, October 2020. $262.5 $262.5 $262.5 $262.5 15. In March 2018, October 2020 February 2023 $170.6 December 31, 2020 15. The amended Credit Facility is subject to certain financial covenants, including a consolidated financial leverage ratio and consolidated fixed charge coverage ratio. Subject to the specifically defined terms and methods of calculation as set forth in the amended Credit Facility’s credit agreement, the financial covenant requirements, as of December 31, 2020, • Consolidated financial leverage ratio, as amended, compares consolidated funded indebtedness to amended Credit Facility defined income with a maximum amount not 1.00. December 31, 2020, 1.00 • Consolidated fixed charge coverage ratio, as amended, compares amended Credit Facility defined income to amended Credit Facility defined fixed charges with a minimum permitted ratio of not 1.00. December 31, 2020, 1.00. At December 31, 2020,

Note 10 - Stockholders' Equity

Note 10 - Stockholders' Equity	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Stockholders' Equity Note Disclosure [Text Block]	10. Share Repurchase Plan In December 2019, two million two million December 2018. December 31, 2020, 2018 two million 2019 one 10b5 1 1934. March 2020 October 2020, 10b5 1 19. November 2020, 1.00; 1.00. February 16, 2021, 17. The Company is also authorized to repurchase up to $10.0 million of the Company’s common stock in each calendar year in connection with the Company’s equity compensation programs for employees. The participants in the Company’s equity plans may may During 2020, 2020, not During 2019, During 2018, 2018, not Equity-Based Compensation Plans Employee Plans In April 2016, 2016 2017 2016 “2016 April 2018, 2016 2016 2016 2013 2016 December 31, 2020, 2016 Director Plans In April 2016, 2016 “2016 2011 April 2019, 2016 2016 2016 2016 2016 December 31, 2020, 2016 Prior to the 2016 2011 “2011 2006 “2006 2001 “2001 December 31, 2020, 2016 2011 2006 2001 Activity and related expense associated with these plans are described in Note 11.

Note 11 - Equity-based Compensa

Note 11 - Equity-based Compensation	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Share-based Payment Arrangement [Text Block]	11. Stock Awards Stock awards, which include shares of restricted stock, restricted stock units and performance stock units, are awarded from time to time to executive officers and certain key employees of the Company. Stock award compensation is recorded based on the award date fair value and charged to expense ratably through the requisite service period. The forfeiture of unvested restricted stock, restricted stock units and performance stock units causes the reversal of all previous expense recorded as a reduction of current period expense. A summary of stock award activity is as follows: Years Ended December 31, 2020 2019 2018 Stock Awards Weighted Average Award Date Fair Value Stock Awards Weighted Average Award Date Fair Value Stock Awards Weighted Average Award Date Fair Value Outstanding, beginning of year 1,034,964 $ 23.20 1,143,205 $ 23.26 1,428,878 $ 21.53 Period Activity: Restricted stock units awarded 420,377 19.87 325,321 20.02 281,567 24.13 Performance stock units awarded 131,755 22.96 146,367 22.78 219,943 23.25 Restricted shares distributed — — (76,686 ) 18.26 — — Restricted stock units distributed (297,322 ) 20.50 (237,416 ) 18.83 (312,182 ) 17.47 Performance stock units distributed (71,541 ) 28.18 (111,155 ) 25.85 (296,909 ) 21.55 Restricted stock units forfeited (93,696 ) 18.17 (74,075 ) 22.09 (90,896 ) 21.79 Performance stock units forfeited (80,930 ) 27.19 (80,597 ) 25.30 (87,196 ) 25.95 Outstanding, end of year 1,043,607 $ 22.40 1,034,964 $ 23.20 1,143,205 $ 23.26 Expense associated with stock awards was $8.9 million, $7.0 million and $6.8 million in 2020 2019 2018 December 31, 2020 Deferred Stock Unit Awards Deferred stock units are generally awarded to directors of the Company and represent the Company’s obligation to transfer one April 2019, 2016 one A summary of deferred stock unit activity is as follows: Years Ended December 31, 2020 2019 2018 Deferred Weighted Deferred Weighted Deferred Weighted Outstanding, beginning of year 253,340 $ 20.71 287,350 $ 20.80 269,977 $ 20.14 Period Activity: Awarded 70,426 14.59 50,174 19.64 45,681 23.72 Distributed (59,297 ) 21.66 (84,184 ) 20.38 (28,308 ) 19.22 Outstanding, end of year 264,469 $ 18.87 253,340 $ 20.71 287,350 $ 20.80 Expense associated with awards of deferred stock units was $1.0 million, $0.7 million and $1.1 million in 2020 2019 2018 December 31, 2020 Stock Options Stock options on the Company’s common stock are awarded from time to time to executive officers and certain key employees of the Company. Stock options granted generally have a term of seven ten A summary of stock option activity is as follows: Years Ended December 31, 2019 2018 Shares Weighted Average Exercise Price Shares Weighted Average Exercise Price Outstanding, beginning of year 52,783 $ 18.11 126,680 $ 23.06 Exercised (52,783 ) 18.11 — — Canceled/Expired — — (73,897 ) 26.60 Outstanding, end of year — $ — 52,783 $ 18.11 Exercisable, end of year — $ — 52,783 $ 18.11 In 2020 2019 2018 Financial data for stock option exercises are summarized in the following table (in thousands): Years Ended December 31, 2019 2018 Amount received from stock option exercises $ 956 $ — Total intrinsic value of stock option exercises (1) 129 — Tax expense (benefit) of stock option exercises recorded in income tax expense 312 (1,556 ) Aggregate intrinsic value of outstanding stock options — — Aggregate intrinsic value of exercisable stock options — — ( 1 December 31, 2019.

Note 12 - Taxes on Income

Note 12 - Taxes on Income	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Income Tax Disclosure [Text Block]	12. Income (loss) before taxes (benefit) was as follows (in thousands): Years Ended December 31, 2020 2019 2018 Domestic $ 10,454 $ (3,469 ) $ 1,122 Foreign 19,613 (16,511 ) (5,187 ) Total $ 30,067 $ (19,980 ) $ (4,065 ) Provisions (benefits) for taxes on income (loss) consisted of the following components (in thousands): Years Ended December 31, 2020 2019 2018 Current: Federal $ (1,683 ) $ (3,116 ) $ (4,902 ) Foreign 5,010 5,705 6,025 State 794 49 (722 ) Subtotal 4,121 2,638 401 Deferred: Federal (421 ) (994 ) 58 Foreign 704 (199 ) (1,531 ) State 863 2,565 (221 ) Subtotal 1,146 1,372 (1,694 ) Total tax provision $ 5,267 $ 4,010 $ (1,293 ) The reconciliation between the U.S. federal statutory income tax rate of 21% for 2020, 2019 2018 Years Ended December 31, 2020 2019 2018 Income taxes (benefit) at U.S. federal statutory tax rate $ 6,315 $ (4,196 ) $ (854 ) Increase (decrease) in taxes resulting from: Change in the balance of the valuation allowance for deferred tax assets allocated to foreign income tax expense 38 806 590 Change in the balance of the valuation allowance for deferred tax assets allocated to domestic income tax expense (1,256 ) 3,025 (564 ) State income taxes, net of federal income tax benefit 1,051 2,033 (791 ) Divestitures (501 ) 5,613 2,133 Meals and entertainment 271 442 482 Changes in taxes previously accrued 45 (1,557 ) (573 ) Foreign tax rate differences (176 ) (643 ) 1,301 Share-based compensation 572 358 (1,427 ) Goodwill impairment — — 291 Recognition of uncertain tax positions (504 ) (717 ) (218 ) Deemed mandatory repatriation — — (842 ) Other matters (588 ) (1,154 ) (821 ) Total tax provision $ 5,267 $ 4,010 $ (1,293 ) Effective tax rate 17.5 % (20.1 %) 31.8 % Deferred taxes are recognized for temporary differences between the financial reporting bases and tax bases of assets and liabilities based on enacted tax rates expected to be in effect when such amounts are realized or settled. However, deferred tax assets are recognized only to the extent that it is more likely than not Net deferred taxes consisted of the following (in thousands): December 31, 2020 2019 Deferred income tax assets: Foreign tax credit carryforwards $ 6,152 $ 4,101 General business credit carryforwards 1,485 844 Net operating loss carryforwards 15,546 19,079 Accrued expenses 15,047 15,119 Operating lease liabilities 15,820 17,360 Other 5,999 7,587 Total gross deferred income tax assets 60,049 64,090 Less valuation allowance (43,424 ) (34,247 ) Net deferred income tax assets 16,625 29,843 Deferred income tax liabilities: Property, plant and equipment (4,625 ) (5,689 ) Intangible assets (1,009 ) (12,203 ) Operating lease assets (15,464 ) (17,198 ) Other (5,423 ) (4,791 ) Total deferred income tax liabilities (26,521 ) (39,881 ) Net deferred income tax liabilities $ (9,896 ) $ (10,038 ) The Company’s tax assets and liabilities, netted by taxing location, are in the following captions in the balance sheets (in thousands): December 31, 2020 2019 Noncurrent deferred income tax assets, net $ 448 $ 1,216 Noncurrent deferred income tax liabilities, net (10,344 ) (11,254 ) Net deferred income tax liabilities $ (9,896 ) $ (10,038 ) The Company’s deferred tax assets at December 31, 2020 not 2021 2040, no 2026 not 2029 not 2030 not no 2038 not 2039 not 2040 not For financial reporting purposes, a valuation allowance of $43.4 million has been recognized at December 31, 2020 not not December 31, 2019 As of December 31, 2020 not no may Activity in the valuation allowance is summarized as follows (in thousands): Years Ended December 31, 2020 2019 2018 Balance, at beginning of year $ 34,247 $ 28,451 $ 29,782 Additions 14,677 8,789 1,879 Reversals (6,571 ) (6,776 ) (2,102 ) Other adjustments 1,071 3,783 (1,108 ) Balance, at end of year $ 43,424 $ 34,247 $ 28,451 As a result of the deemed mandatory repatriation provisions in the Tax Cuts and Jobs Act (“TCJA”), the Company included $206.7 million of undistributed earnings in income subject to U.S. tax at reduced tax rates. Certain provisions within the TCJA effectively transition the U.S. to a territorial system and eliminates deferral on U.S. taxation for certain amounts of income that are not not 100 not not December 31, 2020 FASB ASC 740, Income Taxes 740” not 740 A reconciliation of the beginning and ending balance of unrecognized tax benefits is as follows (in thousands): Years Ended December 31, 2020 2019 2018 Balance, at beginning of year $ 1,384 $ 1,955 $ 2,229 Additions for tax positions of prior years 51 9 8 Lapse in statute of limitations (451 ) (587 ) (264 ) Foreign currency translation 7 7 (18 ) Balance, at end of year, total tax provision $ 991 $ 1,384 $ 1,955 The total amount of unrecognized tax benefits, if recognized, that would affect the effective tax rate was $0.3 million at December 31, 2020 The Company recognizes interest and penalties, if any, related to unrecognized tax benefits in income tax expense. During the years ended December 31, 2020, 2019 2018 The Company believes that it is reasonably possible that the total amount of unrecognized tax benefits will change in 2021. twelve The Company is subject to taxation in the United States, various states and foreign jurisdictions. With few exceptions, the Company is no 2016.

Note 13 - Commitments and Conti

Note 13 - Commitments and Contingencies	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	13. Litigation The Company is involved in certain litigation incidental to the conduct of its business and affairs. Management, after consultation with legal counsel, does not Purchase Commitments The Company had no December 31, 2020 Guarantees The Company has many contracts that require the Company to indemnify the other party against loss from claims, including claims of patent or trademark infringement or other third third not no not The Company regularly reviews its exposure under all its engagements, including performance guarantees by contractual joint ventures and indemnification of its surety. As a result of the most recent review, the Company has determined that the risk of material loss is remote under these arrangements and has not December 31, 2020 Retirement Plans Approximately 948 of our U.S. employees participate in multi-employer retirement plans. Substantially all of the Company’s remaining U.S. employees are eligible to participate in one 401 December 31, 2020, 2019 2018, April 2020 November 2020, 19. Certain foreign subsidiaries maintain various other defined contribution retirement plans. Company contributions to such plans for the years ended December 31, 2020, 2019 2018 In connection with the Company’s 2009 no December 31, 2020, 2019 2018 December 31, 2020 December 31, 2019 2 2.

Note 14 - Segment and Geographi

Note 14 - Segment and Geographic Information	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	14. The Company has two December 2020, 6 December 31, 2020, 2019 2018. December 31, 2020, 2019 2018. The following disaggregated financial results have been prepared using a management approach that is consistent with the basis and manner with which management internally disaggregates financial information for the purpose of making internal operating decisions. The Company evaluates performance based on stand-alone operating income (loss), which includes acquisition and divestiture expenses and restructuring charges, if applicable. Financial information by segment was as follows (in thousands): Years Ended December 31, 2020 2019 2018 Revenues: Infrastructure Solutions $ 562,571 $ 590,797 $ 604,121 Corrosion Protection 245,193 295,090 393,740 Total revenues $ 807,764 $ 885,887 $ 997,861 Gross profit: Infrastructure Solutions $ 144,213 $ 144,074 $ 132,411 Corrosion Protection 52,246 60,927 92,968 Total gross profit $ 196,459 $ 205,001 $ 225,379 Operating income (loss): Infrastructure Solutions (1) $ 78,098 $ 42,079 $ 37,509 Corrosion Protection (2) (6,133 ) (5,635 ) 16,283 Corporate (3) (30,977 ) (35,211 ) (33,783 ) Total operating income 40,988 1,233 20,009 Other income (expense): Interest expense (4) (12,483 ) (11,358 ) (14,709 ) Interest income 1,125 1,038 516 Other (5) 437 (10,893 ) (9,881 ) Total other expense (10,921 ) (21,213 ) (24,074 ) Income (loss) before taxes (benefit) on income (loss) $ 30,067 $ (19,980 ) $ (4,065 ) Total assets: Infrastructure Solutions $ 511,606 $ 508,226 $ 500,977 Corrosion Protection 238,566 278,694 279,106 Corporate and other 58,425 39,794 50,098 Assets held for sale 92,850 168,799 162,236 Total assets $ 901,447 $ 995,513 $ 992,417 Capital expenditures: (6) Infrastructure Solutions $ 10,103 $ 10,679 $ 12,730 Corrosion Protection 5,654 11,437 9,754 Corporate 802 3,219 4,977 Total capital expenditures $ 16,559 $ 25,335 $ 27,461 Depreciation and amortization: (7) Infrastructure Solutions $ 14,174 $ 13,773 $ 16,758 Corrosion Protection 12,007 12,487 11,874 Corporate 2,521 2,413 2,112 Total depreciation and amortization $ 28,702 $ 28,673 $ 30,744 ( 1 Operating income for 2020 4 2019 4 6 2018 4 ( 2 Operating loss for 2020 4 2019 4 6 2018 4 ( 3 Operating loss for 2020 4 6 2019 4 6 2018 4 ( 4 Interest expense for 2020 third 9 2018 third 9 ( 5 Other expense for 2020 4 2019 4 2018 1 4 ( 6 Capital expenditures from our discontinued operations were $3.0 million, $3.4 million and $3.1 million in 2020, 2019 2018, ( 7 Depreciation and amortization from our discontinued operations were $6.8 million, $7.5 million and $7.1 million in 2020, 2019 2018, The following table summarizes revenues, gross profit, operating income (loss) and long-lived assets by geographic region (in thousands): Years Ended December 31, 2020 2019 2018 Revenues: (1) United States $ 572,729 $ 586,628 $ 630,584 Canada 118,253 123,033 133,612 Europe 37,251 64,278 66,794 Other foreign 79,531 111,948 166,871 Total revenues $ 807,764 $ 885,887 $ 997,861 Gross profit: (1) United States $ 139,308 $ 134,471 $ 136,477 Canada 24,360 22,183 22,823 Europe 11,437 14,849 8,379 Other foreign 21,354 33,498 57,700 Total gross profit $ 196,459 $ 205,001 $ 225,379 Operating income (loss): (1) United States $ 18,817 $ (3,528 ) $ (9,464 ) Canada 11,849 7,460 9,482 Europe 6,230 (11,363 ) (10,599 ) Other foreign 4,092 8,664 30,590 Total operating income $ 40,988 $ 1,233 $ 20,009 Long-lived assets: (1)(2) United States $ 89,487 $ 83,225 $ 105,978 Canada 7,817 7,462 7,725 Europe 3,073 3,336 8,295 Other foreign 1,413 10,192 6,662 Total long-lived assets $ 101,790 $ 104,215 $ 128,660 ( 1 Attributed to the country of origin. ( 2 Long-lived assets do not

Note 15 - Derivative Financial

Note 15 - Derivative Financial Instruments	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Derivative Instruments and Hedging Activities Disclosure [Text Block]	15. As a matter of policy, the Company uses derivatives for risk management purposes, and does not may no December 31, 2020 2019, The Company also engages in regular inter-company trade activities and receives royalty payments from certain of its wholly-owned entities, paid in local currency, rather than the Company’s functional currency, U.S. Dollars. The Company utilizes foreign currency forward exchange contracts to mitigate the currency risk associated with the anticipated future payments from certain of its international entities. No contracts were utilized during 2020. 2019 2018, In October 2015, October 2020. $262.5 $262.5 In March 2018, October 2020 February 2023 The following table summarizes the Company’s derivative positions at December 31, 2020 Position Notional Amount Weighted Average Remaining Maturity In Years Average Exchange Rate Interest Rate Swap — $ 166,287,598 2.2 — The following table summarizes the fair value amounts of the Company’s derivative instruments, all of which are Level 2 2 December 31, Designation of Derivatives Balance Sheet Location 2020 2019 Derivatives Designated as Hedging Instruments: Interest Rate Swaps Other non-current assets $ - $ 261 Total Assets $ - $ 261 Interest Rate Swaps Other non-current liabilities $ 9,018 $ 4,899 Total Liabilities $ 9,018 $ 4,899 Total Derivative Assets $ - $ 261 Total Derivative Liabilities 9,018 4,899 Total Net Derivative Liability $ (9,018 ) $ (4,638 )

Note 16 - Subsequent Event

Note 16 - Subsequent Event	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Subsequent Events [Text Block]	16. On February 16, 2021, no second 2021, As a result of the agreement, the Company terminated the open market share repurchase program effective February 16, 2021. January 1, 2021 February 15, 2021,

Significant Accounting Policies

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Consolidation, Policy [Policy Text Block]	Principles of Consolidation The consolidated financial statements include the accounts of the Company, its wholly-owned subsidiaries and majority-owned subsidiaries in which the Company is deemed to be the primary beneficiary. All significant intercompany transactions and balances have been eliminated.
Use of Estimates, Policy [Policy Text Block]	Accounting Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Foreign Currency Transactions and Translations Policy [Policy Text Block]	Accumulated Other Comprehensive Loss As set forth below, the Company’s accumulated other comprehensive loss is comprised of three December 31, 2020 2019 Currency translation adjustments (1) $ (19,760 ) $ (27,241 ) Derivative hedging activity (9,018 ) (4,522 ) Pension activity (1,069 ) (931 ) Total accumulated other comprehensive loss $ (29,847 ) $ (32,694 ) ( 1 During 2020 2019, $0.3 million and $10.9 For the Company’s international subsidiaries, the local currency is generally the functional currency. Assets and liabilities of these subsidiaries are translated into U.S. dollars using rates in effect at the balance sheet date while revenues and expenses are translated into U.S. dollars using average exchange rates. The cumulative translation adjustment resulting from changes in exchange rates are included in the Consolidated Balance Sheets as a component of “Accumulated other comprehensive loss” in total stockholders’ equity. Net foreign exchange transaction losses of $0.8 million, $0.5 million and $0.6 million for 2020, 2019 2018,
Research and Development Expense, Policy [Policy Text Block]	Research and Development The Company expenses research and development costs as incurred. Research and development costs of $4.9 million, $6.4 million and $5.6 million for 2020, 2019 2018,
Income Tax, Policy [Policy Text Block]	Taxation The Company provides for estimated income taxes payable or refundable on current year income tax returns as well as the estimated future tax effects attributable to temporary differences and carryforwards, based upon enacted tax laws and tax rates, and in accordance with FASB ASC 740, Income Taxes 740” 740 not not may In accordance with FASB ASC 740, may not 50% 740. The Company recognizes tax liabilities in accordance with FASB ASC 740 not may December 31, 2019 2018 740,
Earnings Per Share, Policy [Policy Text Block]	Earnings per Share Earnings per share have been calculated using the following share information: Years Ended December 31, 2020 2019 2018 Weighted average number of common shares used for basic EPS 30,731,882 31,130,222 32,345,382 Effect of dilutive stock options and restricted and deferred stock unit awards 509,253 — — Weighted average number of common shares and dilutive potential common stock used for dilutive EPS 31,241,135 31,130,222 32,345,382 The Company excluded 529,539 and 652,621 restricted and deferred stock units in 2019 2018, 2018
Business Combinations Policy [Policy Text Block]	Purchase Price Accounting The Company accounts for its acquisitions in accordance with FASB ASC 805, Business Combinations The Company typically determines the fair value of tangible and intangible assets acquired in a business combination using independent valuations that rely on management’s estimates of inputs and assumptions that a market participant would use. Key assumptions include cash flow projections, growth rates, asset lives, and discount rates based on an analysis of weighted average cost of capital.
Classification of Current Assets and Liabilities [Policy Text Block]	Classification of Current Assets and Current Liabilities The Company includes in current assets and current liabilities certain amounts realizable and payable under construction contracts that may one one
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash, Cash Equivalents and Restricted Cash The Company classifies highly liquid investments with original maturities of 90 Cash, cash equivalents and restricted cash reported within the Consolidated Balance Sheets and Consolidated Statements of Cash Flows are as follows (in thousands): December 31, Balance sheet data 2020 2019 Cash and cash equivalents $ 94,848 $ 64,874 Restricted cash 765 1,348 Cash, cash equivalents and restricted cash $ 95,613 $ 66,222 Restricted cash held in escrow primarily relates to funds reserved for legal requirements, deposits made in lieu of retention on specific projects performed for municipalities and state agencies, or advance customer payments and compensating balances for bank undertakings in Europe. Restricted cash related to operations is similar to retainage, and is, therefore, classified as a current asset, consistent with the Company’s policy on retainage.
Inventory, Policy [Policy Text Block]	Inventories Inventories are stated at the lower of cost ( first first
Retainage [Policy Text Block]	Retainage Many of the contracts under which the Company performs work contain retainage provisions. Retainage refers to that portion of revenue earned by the Company but held for payment by the customer pending satisfactory completion of the project. The Company generally invoices its customers periodically as work is completed. Under ordinary circumstances, collection from municipalities is made within 60 to 90 days of billing. In most cases, 5% to 15% of the contract value is withheld by the municipal owner pending satisfactory completion of the project. Collections from other customers are generally made within 30 to 45 days of billing. Unless reserved, the Company believes that all amounts retained by customers under such provisions are fully collectible. Retainage on active contracts is classified as a current asset regardless of the term of the contract. Retainage is generally collected within one one December 31, 2020 365
Receivables, Trade and Other Accounts Receivable, Allowance for Doubtful Accounts, Policy [Policy Text Block]	Credit Losses The Company is exposed to credit losses primarily through sales of products and services. The Company’s expected loss allowance methodology for accounts receivable, including retainage, is developed using historical collection experience, current and future economic and market conditions and a review of the current status of customers’ trade accounts receivables. Due to the short-term nature of such receivables, the estimate of amount of accounts receivable that may not
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]	Long-Lived Assets Property, plant and equipment and other identified intangibles (primarily customer relationships, patents and acquired technologies, trademarks, licenses and non-compete agreements) are recorded at cost, net of accumulated depreciation, amortization and impairment, and, except for goodwill, are depreciated or amortized on a straight-line basis over their estimated useful lives. Changes in circumstances such as technological advances, changes to the Company’s business model or changes in the Company’s capital strategy can result in the actual useful lives differing from the Company’s estimates. If the Company determines that the useful life of its property, plant and equipment or its identified intangible assets should be shortened, the Company would depreciate or amortize the net book value in excess of the salvage value over its revised remaining useful life, thereby increasing depreciation or amortization expense. Long-lived assets, including property, plant and equipment and other intangibles, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying value of an asset may not may Impairment Review – Third Quarter 2020 The oil and gas industry experienced an unprecedented disruption during 2020 19 third 2020 2020 2021. 360, Property, Plant and Equipment 360” The assets of an asset group represent the lowest level for which identifiable cash flows can be determined independent of other groups of assets and liabilities. The Energy Services asset group was the only at-risk asset group reviewed for impairment. The Company developed internal forward business plans under the guidance of local and regional leadership to determine the undiscounted expected future cash flows derived from Energy Services’ long-lived assets. Such were based on management’s best estimates considering the likelihood of various outcomes. Based on the internal projections, the Company determined that the sum of the undiscounted expected future cash flows for the Energy Services asset group exceeded the carrying value of the assets and no Impairment Review – Fourth Quarter 2020 In December 2020, 360 no The fair value estimates described above were determined using similar inputs as the fourth 2020
Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]	Goodwill Under FASB ASC 350, Goodwill and Other 350” may not not • significant underperformance of a segment relative to expected, historical or forecasted operating results; • significant negative industry or economic trends; • significant changes in the strategy for a segment including extended slowdowns in the segment’s market; • a decrease in market capitalization below the Company’s book value; and • a significant change in regulations. Whether during the annual impairment assessment or during a trigger-based impairment review, the Company estimates the fair value of its reporting units and compares such fair value to the carrying value of those reporting units to determine if there are any indications of goodwill impairment. Fair value of reporting units is estimated using a combination of two two The market approach estimates fair value by first The income approach is based on forecasted future (debt-free) cash flows that are discounted to present value using factors that consider timing and risk of future cash flows. The Company believes this approach is appropriate because it provides a fair value estimate based upon the reporting unit’s expected long-term operating cash flow performance. Discounted cash flow projections are based on financial forecasts developed from operating plans and economic outlooks, revenue growth rates, EBITDA growth, estimates of future expected changes in operating margins, terminal value growth rates, future capital expenditures and changes in working capital requirements. Estimates of discounted cash flows may The discount rate applied to the estimated future cash flows is one twenty may Impairment Review – Third Quarter 2020 Given the prolonged uncertainty in the oil and gas markets and the market assessment of the Energy Services reporting unit discussed above, the Company evaluated the goodwill of its Energy Services reporting unit during the third 2020 third 350, Significant assumptions used in the Company’s goodwill review included discount rate, revenue growth rates, operating margins, EBITDA growth, terminal value growth rate and peer group EBITDA multiples. The values derived from both the income approach and the market approach decreased from the October 1, 2019 October 1, 2019 twenty 3.2%, October 1, 2019 2020 2021. 100 Based on the impairment analysis, the Company determined that recorded goodwill at the Energy Services reporting unit was impaired by $39.4 million, which was recorded to “Goodwill impairment” in the Consolidated Statement of Operations during the third 2020. September 30, 2020, 6 fourth 2020. Annual Impairment Assessment – October 1, 2020 The Company had six October 1, 2020 Significant assumptions used in the Company’s October 2020 15.7%; 2.2% 8.9%; 19 The Company’s assessment of each reporting unit’s fair value in relation to its respective carrying value yielded: (i) no one 10 one 15 10 third 2020. 15 2020, 19 2021 2022, not Impairment Review – Fourth Quarter 2020 In December 2020, 6.
Fair Value Measurement, Policy [Policy Text Block]	Fair Value Measurements FASB ASC 820, Fair Value Measurements 820” three • Level 1 • Level 2 • Level 3 no The Company uses these levels of hierarchy to measure the fair value of certain financial instruments on a recurring basis, such as for derivative instruments; on a non-recurring basis, such as for acquisitions and impairment testing; for disclosure purposes, such as for long-term debt; and for other applications, as discussed in their respective footnotes. Changes in assumptions or estimation methods could affect the fair value estimates. Other financial instruments including notes payable are recorded at cost, which approximates fair value, and is based on Level 2 no 1, 2 3 2020, 2019 2018.
Consolidation, Variable Interest Entity, Policy [Policy Text Block]	Investments in Variable Interest Entities The Company evaluates all transactions and relationships with variable interest entities (“VIE”) to determine whether the Company is the primary beneficiary of the entities in accordance with FASB ASC 810, Consolidation. no 2020. Financial data for consolidated variable interest entities are summarized in the following tables (in thousands): December 31, Balance sheet data 2020 2019 Current assets $ 24,876 $ 18,304 Non-current assets 7,513 7,635 Current liabilities 10,932 8,261 Non-current liabilities 3,279 1,962 Years Ended December 31, Statement of operations data 2020 2019 (1) 2018(1)(2) Revenue $ 31,930 $ 28,403 $ 49,809 Gross profit 10,862 9,508 9,898 Net (income) loss attributable to Aegion Corporation 1,209 (1,100 ) (1,374 ) ( 1 Includes activity from our Tite Liner ® fourth 2019. ( 2 Includes activity from our pipe coating and insulation joint venture in Louisiana, which was sold during the third 2018.
New Accounting Pronouncements, Policy [Policy Text Block]	Accounting Standards Updates In March 2020, No. 2020 04, Reference Rate Reform (Topic 848 December 31, 2022. not In December 2019, No. 2019 12, Simplifying the Accounting for Income Taxes 740 January 1, 2021, January 1, 2020, not In August 2018, No. 2018 13, Fair Value Measurement: Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement 1, 2 3 January 1, 2020, January 1, 2020, not In June 2016, No. 2016 13, Measurement of Credit Losses on Financial Instruments January 1, 2020, January 1, 2020, not

Note 2 - Accounting Policies (T

Note 2 - Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	December 31, 2020 2019 Currency translation adjustments (1) $ (19,760 ) $ (27,241 ) Derivative hedging activity (9,018 ) (4,522 ) Pension activity (1,069 ) (931 ) Total accumulated other comprehensive loss $ (29,847 ) $ (32,694 )
Schedule of Weighted Average Number of Shares [Table Text Block]	Years Ended December 31, 2020 2019 2018 Weighted average number of common shares used for basic EPS 30,731,882 31,130,222 32,345,382 Effect of dilutive stock options and restricted and deferred stock unit awards 509,253 — — Weighted average number of common shares and dilutive potential common stock used for dilutive EPS 31,241,135 31,130,222 32,345,382
Restrictions on Cash and Cash Equivalents [Table Text Block]	December 31, Balance sheet data 2020 2019 Cash and cash equivalents $ 94,848 $ 64,874 Restricted cash 765 1,348 Cash, cash equivalents and restricted cash $ 95,613 $ 66,222
Schedule of Variable Interest Entities [Table Text Block]	December 31, Balance sheet data 2020 2019 Current assets $ 24,876 $ 18,304 Non-current assets 7,513 7,635 Current liabilities 10,932 8,261 Non-current liabilities 3,279 1,962 Years Ended December 31, Statement of operations data 2020 2019 (1) 2018(1)(2) Revenue $ 31,930 $ 28,403 $ 49,809 Gross profit 10,862 9,508 9,898 Net (income) loss attributable to Aegion Corporation 1,209 (1,100 ) (1,374 )

Note 3 - Revenues (Tables)

Note 3 - Revenues (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Disaggregation of Revenue [Table Text Block]	Year Ended December 31, 2020 Infrastructure Solutions Corrosion Protection Total Geographic region: United States $ 443,196 $ 129,533 $ 572,729 Canada 69,190 49,063 118,253 Europe 23,782 13,469 37,251 Other foreign 26,403 53,128 79,531 Total revenues $ 562,571 $ 245,193 $ 807,764 Year Ended December 31, 2019 Infrastructure Solutions Corrosion Protection Total Geographic region: United States $ 427,220 $ 159,408 $ 586,628 Canada 65,370 57,663 123,033 Europe 49,157 15,121 64,278 Other foreign 49,050 62,898 111,948 Total revenues $ 590,797 $ 295,090 $ 885,887 Year Ended December 31, 2018 Infrastructure Solutions Corrosion Protection Total Geographic region: United States $ 430,187 $ 200,397 $ 630,584 Canada 62,292 71,320 133,612 Europe 54,567 12,227 66,794 Other foreign 57,075 109,796 166,871 Total revenues $ 604,121 $ 393,740 $ 997,861 Year Ended December 31, 2020 Infrastructure Solutions Corrosion Protection Total Contract type: Fixed fee $ 513,187 $ 162,334 $ 675,521 Time and materials — 52,713 52,713 Product sales 49,353 30,146 79,499 License fees 31 — 31 Total revenues $ 562,571 $ 245,193 $ 807,764 Year Ended December 31, 2019 Infrastructure Solutions Corrosion Protection Total Contract type: Fixed fee $ 523,042 $ 203,887 $ 726,929 Time and materials — 65,084 65,084 Product sales 67,512 26,119 93,631 License fees 243 — 243 Total revenues $ 590,797 $ 295,090 $ 885,887 Year Ended December 31, 2018 Infrastructure Solutions Corrosion Protection Total Contract type: Fixed fee $ 556,642 $ 296,217 $ 852,859 Time and materials — 58,372 58,372 Product sales 45,030 39,151 84,181 License fees 2,449 — 2,449 Total revenues $ 604,121 $ 393,740 $ 997,861
Contract Asset and Liability [Table Text Block]	December 31, 2020 (1) 2019 (2) Contract assets – current $ 44,026 $ 42,973 Contract liabilities – current (37,569 ) (37,517 ) Net contract assets $ 6,457 $ 5,456

Note 4 - Restructuring (Tables)

Note 4 - Restructuring (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Restructuring and Related Costs [Table Text Block]	Year Ended December 31, 2020 Infrastructure Solutions Corrosion Protection Corporate Continuing Operations Discontinued Operations Total Severance and benefit related costs $ 29 $ 3,673 $ 324 $ 4,026 $ 571 $ 4,597 Contract termination costs 66 (166 ) — (100 ) 199 99 Relocation and other moving costs 99 137 — 236 34 270 Other restructuring costs (1) (1,626 ) 5,864 2,879 7,117 4,654 11,771 Total pre-tax restructuring charges $ (1,432 ) $ 9,508 $ 3,203 $ 11,279 $ 5,458 $ 16,737 Year Ended December 31, 2019 Infrastructure Solutions Corrosion Protection Corporate Continuing Operations Discontinued Operations Total Severance and benefit related costs $ 938 $ 3,179 $ 1,685 $ 5,802 $ 553 $ 6,355 Contract termination costs 601 1,089 98 1,788 234 2,022 Relocation and other moving costs 190 408 — 598 55 653 Other restructuring costs (1) 13,642 4,592 4,258 22,492 819 23,311 Total pre-tax restructuring charges $ 15,371 $ 9,268 $ 6,041 $ 30,680 $ 1,661 $ 32,341 Year Ended December 31, 2018 Infrastructure Solutions Corrosion Protection Corporate Continuing Operations Discontinued Operations Total Severance and benefit related costs $ 3,038 $ 1,094 $ 170 $ 4,302 $ 234 $ 4,536 Contract termination costs 1,999 25 150 2,174 — 2,174 Relocation and other moving costs 184 — — 184 — 184 Other restructuring costs (1) 13,311 7,936 1,317 22,564 28 22,592 Total pre-tax restructuring charges $ 18,532 $ 9,055 $ 1,637 $ 29,224 $ 262 $ 29,486 Year Ended December 31, 2020 Infrastructure Solutions Corrosion Protection Corporate Continuing Operations Discontinued Operations Total (1) Cost of revenues $ 69 $ 1,952 $ — $ 2,021 $ — $ 2,021 Operating expenses (357 ) 3,947 2,360 5,950 — 5,950 Restructuring and related charges 194 3,644 324 4,162 — 4,162 Other expense (2) (1,338 ) (35 ) 519 (854 ) — (854 ) Loss from discontinued operations — — — — 5,458 5,458 Total pre-tax restructuring charges $ (1,432 ) $ 9,508 $ 3,203 $ 11,279 $ 5,458 $ 16,737 Year Ended December 31, 2019 Infrastructure Solutions Corrosion Protection Corporate Continuing Operations Discontinued Operations Total (1) Cost of revenues $ 469 $ 1,869 $ — $ 2,338 $ — $ 2,338 Operating expenses 5,349 1,131 3,444 9,924 — 9,924 Restructuring and related charges 1,729 4,676 1,783 8,188 — 8,188 Other expense (2) 7,824 1,592 814 10,230 — 10,230 Income from discontinued operations — — — — 1,661 1,661 Total pre-tax restructuring charges $ 15,371 $ 9,268 $ 6,041 $ 30,680 $ 1,661 $ 32,341 Year Ended December 31, 2018 Infrastructure Solutions Corrosion Protection Corporate Continuing Operations Discontinued Operations Total (1) Cost of revenues $ 1,281 $ 600 $ — $ 1,881 $ — $ 1,881 Operating expenses 7,291 4,547 1,317 13,155 — 13,155 Goodwill impairment 1,389 — — 1,389 — 1,389 Definite-lived intangible asset impairment 870 1,299 — 2,169 — 2,169 Restructuring and related charges 5,221 1,119 320 6,660 — 6,660 Other expense (2) 2,480 1,490 — 3,970 — 3,970 Income from discontinued operations — — — — 262 262 Total pre-tax restructuring charges $ 18,532 $ 9,055 $ 1,637 $ 29,224 $ 262 $ 29,486
Schedule of Restructuring Reserve by Type of Cost [Table Text Block]	Utilized in 2020 Reserves at December 31, 2019 2020 Charge to Income Foreign Currency Translation Cash(1) Non-Cash(2) Reserves at December 31, 2020 Severance and benefit related costs $ 4,389 $ 4,597 $ (30 ) $ 7,179 $ — $ 1,777 Contract termination costs 953 99 (7 ) 1,020 — 25 Relocation and other moving costs 367 270 1 515 — 123 Other restructuring costs 2,379 11,771 35 7,302 4,801 2,082 Total pre-tax restructuring charges $ 8,088 $ 16,737 $ (1 ) $ 16,016 $ 4,801 $ 4,007 Utilized in 2019 Reserves at December 31, 2018 2019 Charge to Income Foreign Currency Translation Cash(1) Non-Cash(2) Reserves at December 31, 2019 Severance and benefit related costs $ 1,742 $ 6,355 $ (11 ) $ 3,697 $ — $ 4,389 Contract termination costs 359 2,022 (20 ) 1,408 — 953 Relocation and other moving costs — 653 (3 ) 283 — 367 Other restructuring costs 311 23,311 (4 ) 8,457 12,782 2,379 Total pre-tax restructuring charges $ 2,412 $ 32,341 $ (38 ) $ 13,845 $ 12,782 $ 8,088 Utilized in 2018 Reserves at December 31, 2017 2018 Charge to Income Foreign Currency Translation Cash(1) Non-Cash(2) Reserves at December 31, 2018 Severance and benefit related costs $ 3,864 $ 4,536 $ (69 ) $ 6,589 $ — $ 1,742 Contract termination costs 650 2,174 (19 ) 2,446 — 359 Relocation and other moving costs — 184 — 184 — — Other restructuring costs 675 22,592 (3 ) 5,581 17,372 311 Total pre-tax restructuring charges $ 5,189 $ 29,486 $ (91 ) $ 14,800 $ 17,372 $ 2,412

Note 5 - Supplemental Balance_2

Note 5 - Supplemental Balance Sheet Information (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Allowance for Doubtful Accounts [Table Text Block]	Years Ended December 31, 2020 2019 2018 Balance, beginning of year $ 6,404 $ 9,546 $ 5,428 Provision for expected credit losses, net of recoveries (1) 500 (1,930 ) 8,188 Amounts written off and adjustments (2,900 ) (1,212 ) (4,070 ) Balance, end of year $ 4,004 $ 6,404 $ 9,546
Schedule of Inventory, Current [Table Text Block]	December 31, 2020(1) 2019 Raw materials and supplies $ 21,770 $ 27,415 Work-in-process 5,377 5,739 Finished products 8,413 14,937 Construction materials 9,329 9,102 Total $ 44,889 $ 57,193
Property, Plant and Equipment [Table Text Block]	Estimated Useful Lives December 31, (Years) 2020 2019 Land and land improvements $ 7,851 $ 6,703 Buildings and improvements 5 — 40 48,190 49,084 Machinery and equipment 4 — 10 139,844 131,956 Furniture and fixtures 3 — 10 31,188 31,860 Autos and trucks 3 — 10 45,768 45,496 Construction in progress 5,557 7,236 278,398 272,335 Less – Accumulated depreciation (185,498 ) (177,449 ) Property, plant & equipment, less accumulated depreciation $ 92,900 $ 94,886
Schedule of Accrued Liabilities [Table Text Block]	December 31, 2020 2019 Vendor and other accrued expenses $ 17,152 $ 26,313 Estimated casualty and healthcare liabilities 10,624 10,702 Job costs 13,416 12,041 Accrued compensation 17,112 17,045 Income taxes payable 1,360 1,751 Total $ 59,664 $ 67,852

Note 6 - Discontinued Operati_2

Note 6 - Discontinued Operations and Assets and Liabilities Held for Sale (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Disposal Groups, Including Discontinued Operations [Table Text Block]	Years Ended December 31, 2020 2019 2018 Revenues $ 271,529 $ 328,048 $ 335,707 Cost of revenues 247,453 286,814 294,160 Gross profit 24,076 41,234 41,547 Operating expenses 28,455 30,652 31,675 Goodwill impairment 47,977 — — Definite-lived intangible asset impairment 957 — — Restructuring and related charges 804 842 234 Operating income (loss) (54,117 ) 9,740 9,638 Other income (expense): Interest expense (1) (3,308 ) (2,644 ) (2,618 ) Total other expense (3,308 ) (2,644 ) (2,618 ) Income (loss) before taxes on income (57,425 ) 7,096 7,020 Taxes (benefit) on income (loss) (2,269 ) 2,554 1,161 Net income (loss) from discontinued operations $ (55,156 ) $ 4,542 $ 5,859 December 31, 2020(1) 2019(2) Assets held for sale: Current assets Receivables, net $ 26,901 $ 43,256 Retainage 203 518 Contract assets 9,330 13,469 Inventories 60 2,097 Prepaid expenses and other current assets 2,652 3,379 Total current assets 39,146 62,719 Property, plant & equipment, less accumulated depreciation 7,962 17,167 Goodwill 2,640 52,201 Intangible assets, less accumulated amortization 33,718 38,481 Operating lease assets 8,734 11,546 Other non-current assets 650 663 Impairment of assets held for sale — (13,978 ) Total assets held for sale $ 92,850 $ 168,799 Liabilities held for sale: Current liabilities Accounts payable $ 5,211 $ 8,688 Accrued expenses 20,927 16,707 Operating lease liabilities 2,301 1,775 Contract liabilities 165 167 Total current liabilities 28,604 27,337 Operating lease liabilities 7,348 10,368 Other non-current liabilities 196 195 Total liabilities held for sale $ 36,148 $ 37,900

Note 7 - Leases (Tables)

Note 7 - Leases (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Lease, Cost [Table Text Block]	Years Ended December 31, 2020 2019 Operating lease cost $ 19,750 $ 22,235 Short-term lease cost 24,607 25,382 Total lease cost $ 44,357 $ 47,617 Years Ended December 31, 2020 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 19,083 $ 22,144 Right-of-use assets obtained in exchange for lease obligations: Operating leases $ 7,708 $ 18,879
Lease, Supplemental Financial Statement Disclosures, Balance Sheet [Table Text Block]	December 31, 2020 (1) 2019 (2) Operating leases: Operating lease assets $ 52,421 $ 60,246 Current liabilities $ 14,147 $ 14,204 Other liabilities 38,724 46,059 Total operating lease liabilities $ 52,871 $ 60,263 Weighted-average remaining lease term (in years) 4.85 5.74 Weighted-average discount rate 4.96 % 5.71 %
Lessee, Operating Lease, Liability, Maturity [Table Text Block]	December 31, 2020 2021 $ 16,380 2022 13,536 2023 10,784 2024 7,511 2025 4,415 Thereafter 6,965 Total undiscounted operating lease liabilities 59,591 Less: Imputed interest (6,720 ) Total discounted operating lease liabilities $ 52,871

Note 8 - Goodwill and Intangi_2

Note 8 - Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Schedule of Goodwill [Table Text Block]	Infrastructure Solutions Corrosion Protection Total Balance, December 31, 2018 Goodwill, gross $ 244,521 $ 76,383 $ 320,904 Accumulated impairment losses (62,848 ) (45,400 ) (108,248 ) Goodwill, net 181,673 30,983 212,656 2019 Activity: Foreign currency translation (137 ) 563 426 Reclassification to assets held for sale (1) (4,224 ) — (4,224 ) Balance, December 31, 2019 Goodwill, gross 240,160 76,946 317,106 Accumulated impairment losses (62,848 ) (45,400 ) (108,248 ) Goodwill, net 177,312 31,546 208,858 2020 Activity: Foreign currency translation 1,559 248 1,807 Balance, December 31, 2020 Goodwill, gross 241,719 77,194 318,913 Accumulated impairment losses (62,848 ) (45,400 ) (108,248 ) Goodwill, net $ 178,871 $ 31,794 $ 210,665
Schedule of Finite-Lived Intangible Assets [Table Text Block]	December 31, 2020 December 31, 2019 Weighted Average Useful Lives (Years) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount License agreements — $ 3,894 $ (3,894 ) $ — $ 3,894 $ (3,824 ) $ 70 Leases — 864 (864 ) — 864 (777 ) 87 Trademarks 8.4 14,758 (7,459 ) 7,299 14,688 (6,695 ) 7,993 Non-competes 2.3 1,561 (1,008 ) 553 1,556 (784 ) 772 Customer relationships 5.7 95,058 (56,602 ) 38,456 94,865 (50,104 ) 44,761 Patents and acquired technology 6.9 39,756 (27,195 ) 12,561 39,288 (25,096 ) 14,192 Total intangible assets — $ 155,891 $ (97,022 ) $ 58,869 $ 155,155 $ (87,280 ) $ 67,875

Note 9 - Long-term Debt and C_2

Note 9 - Long-term Debt and Credit Facility (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Schedule of Long-term Debt Instruments [Table Text Block]	December 31, 2020 2019 Term note, due February 27, 2023, annualized rates of 2.00 4.09 $ 221,717 $ 253,750 Line of credit, 2.00 4.01 — 24,000 Other notes with interest rates from 3.3 7.8 750 770 Subtotal 222,467 278,520 Less – Current maturities of long-term debt 25,811 32,803 Less – Unamortized loan costs 2,668 2,088 Total $ 193,988 $ 243,629
Schedule of Maturities of Long-term Debt [Table Text Block]	December 31, 2020 2021 $ 25,811 2022 30,844 2023 165,812 2024 — 2025 — Thereafter — Total $ 222,467

Note 11 - Equity-based Compen_2

Note 11 - Equity-based Compensation (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]	Years Ended December 31, 2020 2019 2018 Stock Awards Weighted Average Award Date Fair Value Stock Awards Weighted Average Award Date Fair Value Stock Awards Weighted Average Award Date Fair Value Outstanding, beginning of year 1,034,964 $ 23.20 1,143,205 $ 23.26 1,428,878 $ 21.53 Period Activity: Restricted stock units awarded 420,377 19.87 325,321 20.02 281,567 24.13 Performance stock units awarded 131,755 22.96 146,367 22.78 219,943 23.25 Restricted shares distributed — — (76,686 ) 18.26 — — Restricted stock units distributed (297,322 ) 20.50 (237,416 ) 18.83 (312,182 ) 17.47 Performance stock units distributed (71,541 ) 28.18 (111,155 ) 25.85 (296,909 ) 21.55 Restricted stock units forfeited (93,696 ) 18.17 (74,075 ) 22.09 (90,896 ) 21.79 Performance stock units forfeited (80,930 ) 27.19 (80,597 ) 25.30 (87,196 ) 25.95 Outstanding, end of year 1,043,607 $ 22.40 1,034,964 $ 23.20 1,143,205 $ 23.26
Share-based Payment Arrangement, Outstanding Award, Activity, Excluding Option [Table Text Block]	Years Ended December 31, 2020 2019 2018 Deferred Weighted Deferred Weighted Deferred Weighted Outstanding, beginning of year 253,340 $ 20.71 287,350 $ 20.80 269,977 $ 20.14 Period Activity: Awarded 70,426 14.59 50,174 19.64 45,681 23.72 Distributed (59,297 ) 21.66 (84,184 ) 20.38 (28,308 ) 19.22 Outstanding, end of year 264,469 $ 18.87 253,340 $ 20.71 287,350 $ 20.80
Share-based Payment Arrangement, Option, Activity [Table Text Block]	Years Ended December 31, 2019 2018 Shares Weighted Average Exercise Price Shares Weighted Average Exercise Price Outstanding, beginning of year 52,783 $ 18.11 126,680 $ 23.06 Exercised (52,783 ) 18.11 — — Canceled/Expired — — (73,897 ) 26.60 Outstanding, end of year — $ — 52,783 $ 18.11 Exercisable, end of year — $ — 52,783 $ 18.11
Cash Proceeds Received and Tax Benefit from Share-based Payment Awards [Table Text Block]	Years Ended December 31, 2019 2018 Amount received from stock option exercises $ 956 $ — Total intrinsic value of stock option exercises (1) 129 — Tax expense (benefit) of stock option exercises recorded in income tax expense 312 (1,556 ) Aggregate intrinsic value of outstanding stock options — — Aggregate intrinsic value of exercisable stock options — —

Note 12 - Taxes on Income (Tabl

Note 12 - Taxes on Income (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]	Years Ended December 31, 2020 2019 2018 Domestic $ 10,454 $ (3,469 ) $ 1,122 Foreign 19,613 (16,511 ) (5,187 ) Total $ 30,067 $ (19,980 ) $ (4,065 )
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	Years Ended December 31, 2020 2019 2018 Current: Federal $ (1,683 ) $ (3,116 ) $ (4,902 ) Foreign 5,010 5,705 6,025 State 794 49 (722 ) Subtotal 4,121 2,638 401 Deferred: Federal (421 ) (994 ) 58 Foreign 704 (199 ) (1,531 ) State 863 2,565 (221 ) Subtotal 1,146 1,372 (1,694 ) Total tax provision $ 5,267 $ 4,010 $ (1,293 )
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	Years Ended December 31, 2020 2019 2018 Income taxes (benefit) at U.S. federal statutory tax rate $ 6,315 $ (4,196 ) $ (854 ) Increase (decrease) in taxes resulting from: Change in the balance of the valuation allowance for deferred tax assets allocated to foreign income tax expense 38 806 590 Change in the balance of the valuation allowance for deferred tax assets allocated to domestic income tax expense (1,256 ) 3,025 (564 ) State income taxes, net of federal income tax benefit 1,051 2,033 (791 ) Divestitures (501 ) 5,613 2,133 Meals and entertainment 271 442 482 Changes in taxes previously accrued 45 (1,557 ) (573 ) Foreign tax rate differences (176 ) (643 ) 1,301 Share-based compensation 572 358 (1,427 ) Goodwill impairment — — 291 Recognition of uncertain tax positions (504 ) (717 ) (218 ) Deemed mandatory repatriation — — (842 ) Other matters (588 ) (1,154 ) (821 ) Total tax provision $ 5,267 $ 4,010 $ (1,293 ) Effective tax rate 17.5 % (20.1 %) 31.8 %
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	December 31, 2020 2019 Deferred income tax assets: Foreign tax credit carryforwards $ 6,152 $ 4,101 General business credit carryforwards 1,485 844 Net operating loss carryforwards 15,546 19,079 Accrued expenses 15,047 15,119 Operating lease liabilities 15,820 17,360 Other 5,999 7,587 Total gross deferred income tax assets 60,049 64,090 Less valuation allowance (43,424 ) (34,247 ) Net deferred income tax assets 16,625 29,843 Deferred income tax liabilities: Property, plant and equipment (4,625 ) (5,689 ) Intangible assets (1,009 ) (12,203 ) Operating lease assets (15,464 ) (17,198 ) Other (5,423 ) (4,791 ) Total deferred income tax liabilities (26,521 ) (39,881 ) Net deferred income tax liabilities $ (9,896 ) $ (10,038 ) December 31, 2020 2019 Noncurrent deferred income tax assets, net $ 448 $ 1,216 Noncurrent deferred income tax liabilities, net (10,344 ) (11,254 ) Net deferred income tax liabilities $ (9,896 ) $ (10,038 )
Summary of Valuation Allowance [Table Text Block]	Years Ended December 31, 2020 2019 2018 Balance, at beginning of year $ 34,247 $ 28,451 $ 29,782 Additions 14,677 8,789 1,879 Reversals (6,571 ) (6,776 ) (2,102 ) Other adjustments 1,071 3,783 (1,108 ) Balance, at end of year $ 43,424 $ 34,247 $ 28,451
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]	Years Ended December 31, 2020 2019 2018 Balance, at beginning of year $ 1,384 $ 1,955 $ 2,229 Additions for tax positions of prior years 51 9 8 Lapse in statute of limitations (451 ) (587 ) (264 ) Foreign currency translation 7 7 (18 ) Balance, at end of year, total tax provision $ 991 $ 1,384 $ 1,955

Note 14 - Segment and Geograp_2

Note 14 - Segment and Geographic Information (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Schedule of Segment Reporting Information, by Segment [Table Text Block]	Years Ended December 31, 2020 2019 2018 Revenues: Infrastructure Solutions $ 562,571 $ 590,797 $ 604,121 Corrosion Protection 245,193 295,090 393,740 Total revenues $ 807,764 $ 885,887 $ 997,861 Gross profit: Infrastructure Solutions $ 144,213 $ 144,074 $ 132,411 Corrosion Protection 52,246 60,927 92,968 Total gross profit $ 196,459 $ 205,001 $ 225,379 Operating income (loss): Infrastructure Solutions (1) $ 78,098 $ 42,079 $ 37,509 Corrosion Protection (2) (6,133 ) (5,635 ) 16,283 Corporate (3) (30,977 ) (35,211 ) (33,783 ) Total operating income 40,988 1,233 20,009 Other income (expense): Interest expense (4) (12,483 ) (11,358 ) (14,709 ) Interest income 1,125 1,038 516 Other (5) 437 (10,893 ) (9,881 ) Total other expense (10,921 ) (21,213 ) (24,074 ) Income (loss) before taxes (benefit) on income (loss) $ 30,067 $ (19,980 ) $ (4,065 ) Total assets: Infrastructure Solutions $ 511,606 $ 508,226 $ 500,977 Corrosion Protection 238,566 278,694 279,106 Corporate and other 58,425 39,794 50,098 Assets held for sale 92,850 168,799 162,236 Total assets $ 901,447 $ 995,513 $ 992,417 Capital expenditures: (6) Infrastructure Solutions $ 10,103 $ 10,679 $ 12,730 Corrosion Protection 5,654 11,437 9,754 Corporate 802 3,219 4,977 Total capital expenditures $ 16,559 $ 25,335 $ 27,461 Depreciation and amortization: (7) Infrastructure Solutions $ 14,174 $ 13,773 $ 16,758 Corrosion Protection 12,007 12,487 11,874 Corporate 2,521 2,413 2,112 Total depreciation and amortization $ 28,702 $ 28,673 $ 30,744 Years Ended December 31, 2020 2019 2018 Revenues: (1) United States $ 572,729 $ 586,628 $ 630,584 Canada 118,253 123,033 133,612 Europe 37,251 64,278 66,794 Other foreign 79,531 111,948 166,871 Total revenues $ 807,764 $ 885,887 $ 997,861 Gross profit: (1) United States $ 139,308 $ 134,471 $ 136,477 Canada 24,360 22,183 22,823 Europe 11,437 14,849 8,379 Other foreign 21,354 33,498 57,700 Total gross profit $ 196,459 $ 205,001 $ 225,379 Operating income (loss): (1) United States $ 18,817 $ (3,528 ) $ (9,464 ) Canada 11,849 7,460 9,482 Europe 6,230 (11,363 ) (10,599 ) Other foreign 4,092 8,664 30,590 Total operating income $ 40,988 $ 1,233 $ 20,009 Long-lived assets: (1)(2) United States $ 89,487 $ 83,225 $ 105,978 Canada 7,817 7,462 7,725 Europe 3,073 3,336 8,295 Other foreign 1,413 10,192 6,662 Total long-lived assets $ 101,790 $ 104,215 $ 128,660

Note 15 - Derivative Financia_2

Note 15 - Derivative Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]	Position Notional Amount Weighted Average Remaining Maturity In Years Average Exchange Rate Interest Rate Swap — $ 166,287,598 2.2 —
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]	December 31, Designation of Derivatives Balance Sheet Location 2020 2019 Derivatives Designated as Hedging Instruments: Interest Rate Swaps Other non-current assets $ - $ 261 Total Assets $ - $ 261 Interest Rate Swaps Other non-current liabilities $ 9,018 $ 4,899 Total Liabilities $ 9,018 $ 4,899 Total Derivative Assets $ - $ 261 Total Derivative Liabilities 9,018 4,899 Total Net Derivative Liability $ (9,018 ) $ (4,638 )

Note 1 - Description of Busin_2

Note 1 - Description of Business (Details Textual) - USD ($)	Aug. 31, 2018	Aug. 31, 2018	May 31, 2018	Jun. 30, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Oct. 30, 2019
Proceeds from Divestiture of Businesses					$ 3,602,000	$ 0	$ 37,942,000
Goodwill, Ending Balance					$ 210,665,000	$ 208,858,000	212,656,000
Discontinued Operations, Disposed of by Sale [Member] | Bayou Companies, LLC [Member]
Joint Venture Ownership Percentage Sold	51.00%
Disposal Group, Including Discontinued Operation, Consideration	$ 46,000,000	$ 46,000,000
Proceeds from Divestiture of Businesses		38,000,000
Noncash or Part Noncash Divestiture, Amount of Consideration Received		$ 8,000,000
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal							$ 7,000,000
Discontinued Operations, Disposed of by Sale [Member] | Bayou Companies, LLC [Member] | Notes Receivable [Member]
Notes Receivable, Term (Year)		2 years
United Mexico [Member] | Miller Pipeline de Mexico, S.A. de C.V. [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners								45.00%
United Mexico [Member] | Miller Pipeline de Mexico, S.A. de C.V. [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Noncontrolling Interest, Ownership Percentage Sold by Parent								55.00%
Aegion International [Member] | OMAN
Business Acquisition, Percentage of Voting Interests Acquired			50.00%
Noncontrolling Interest, Ownership Percentage by Parent			51.00%
New Mountain Capital, L.L.C. [Member] | Forecast [Member]
Business Combination, Consideration Transferred, Total				$ 963,000,000
Business Acquisition, Share Price (in dollars per share)				$ 26
Business Combination, Termination Fee				$ 30,000,000
Hebna [Member]
Business Combination, Consideration Transferred, Total			$ 6,000,000
Goodwill, Ending Balance			2,700,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total			2,400,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total			$ 900,000

Note 2 - Accounting Policies (D

Note 2 - Accounting Policies (Details Textual) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Oct. 31, 2020USD ($)	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)shares	Dec. 31, 2018USD ($)shares	Oct. 01, 2019
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax, Total			$ 300	$ 10,900
Foreign Currency Transaction Gain (Loss), Realized			(844)	(503)	$ (623)
Research and Development Expense, Total			$ 4,900	6,400	5,600
Retainage Collection Period Upon Completion of Contract (Year)			1 year
Percentage of Retainage Balance, Retainage Receivables Aged Greater than 365 Days			14.00%
Goodwill, Impairment Loss			$ 0	0	1,389
Goodwill, Ending Balance			$ 210,665	$ 208,858	$ 212,656
Number of Reporting Units	6
Energy Services [Member]
Reporting Unit, Percentage of Carrying Amount in Excess of Fair Value		31.30%
Reporting Unit, Increase (Decrease) in Fair Value		$ (67,800)
Reporting Unit, Increase (Decrease) in Fair Value, Percentage		(44.00%)
Goodwill, Impairment Loss		$ 39,400
Goodwill, Ending Balance		$ 7,300
Energy Services [Member] | Weighted Average Cost of Capital [Member]
Goodwill, Measurement Input		0.150				0.130
Energy Services [Member] | Measurement Input, Long-term Revenue Growth Rate [Member]
Goodwill, Measurement Input		0.032				0.034
Fyfe [Member]
Goodwill, Impairment Loss	$ 9,800
Minimum [Member]
Construction Period (Month)			1 month
Collection Period for Municipalities (Day)			60 days
Retainage, Percent of Contract Value Withheld			5.00%
Collection Period for Other than Municipalities (Day)			30 days
Minimum [Member] | Measurement Input, Long-term Revenue Growth Rate [Member]
Goodwill, Measurement Input	0.022
Minimum [Member] | Measurement Input, Discount Rate [Member]
Goodwill, Measurement Input	0.127
Maximum [Member]
Construction Period (Month)			24 months
Collection Period for Municipalities (Day)			90 days
Retainage, Percent of Contract Value Withheld			15.00%
Collection Period for Other than Municipalities (Day)			45 days
Maximum [Member] | Measurement Input, Long-term Revenue Growth Rate [Member]
Goodwill, Measurement Input	0.089
Maximum [Member] | Measurement Input, Discount Rate [Member]
Goodwill, Measurement Input	0.157
Stock Options and Restricted and Deferred Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares				529,539	652,621
Share-based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares					4,049

Note 2 - Accounting Policies -

Note 2 - Accounting Policies - Accumulated Other Comprehensive Income Loss (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
Currency translation adjustments	[1]	$ (19,760)	$ (27,241)
Derivative hedging activity		(9,018)	(4,522)
Pension activity		(1,069)	(931)
Total accumulated other comprehensive loss		$ (29,847)	$ (32,694)
[1]	During 2020 and 2019, as a result of selling or disposing of certain international entities, $0.3 million and $10.9 million, respectively, was reclassified out of accumulated other comprehensive loss to “Other expense” in the Consolidated Statements of Operations.

Note 2 - Accounting Policies _2

Note 2 - Accounting Policies - Earnings Per Share (Details) - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Weighted average number of common shares used for basic EPS (in shares)	30,731,882	31,130,222	32,345,382
Effect of dilutive stock options and restricted and deferred stock unit awards (in shares)	509,253	0	0
Weighted average number of common shares and dilutive potential common stock used for dilutive EPS (in shares)	31,241,135	31,130,222	32,345,382

Note 2 - Accounting Policies _3

Note 2 - Accounting Policies - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Cash and cash equivalents	$ 94,848	$ 64,874
Restricted cash	765	1,348
Cash, cash equivalents and restricted cash	$ 95,613	$ 66,222

Note 2 - Accounting Policies _4

Note 2 - Accounting Policies - Investments in Variable Interest Entities (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019		Dec. 31, 2018
Current assets		$ 477,254	$ 553,103
Current liabilities		224,808	244,376
Revenue	[1]	807,764	885,887		$ 997,861
Gross profit	[1]	196,459	205,001		225,379
Net (income) loss attributable to Aegion Corporation		(31,861)	(20,892)		2,928
Variable Interest Entity, Primary Beneficiary [Member]
Current assets		24,876	18,304
Non-current assets		7,513	7,635
Current liabilities		10,932	8,261
Non-current liabilities		3,279	1,962
Revenue		31,930	28,403	[2]	49,809	[3]
Gross profit		10,862	9,508	[2]	9,898	[3]
Net (income) loss attributable to Aegion Corporation		$ 1,209	$ (1,100)	[2]	$ (1,374)	[3]
[1]	Attributed to the country of origin.
[2]	Includes activity from our Tite Liner® joint venture in Mexico, which was sold during the fourth quarter of 2019.
[3]	Includes activity from our pipe coating and insulation joint venture in Louisiana, which was sold during the third quarter of 2018.

Note 3 - Revenues 1 (Details Te

Note 3 - Revenues 1 (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2018
Retained Earnings (Accumulated Deficit), Ending Balance	$ 327,137	$ 358,998
Disposal Group, Including Discontinued Operation, Contract Assets, Current	9,300	13,500
Disposal Group, Including Discontinued Operation, Contract Liabilities, Current	200	200
Increase (Decrease) in Contract with Customer, Liability	(289)	5,302	$ (22,728)
Contract with Customer, Liability, Total	37,500	32,300
Construction, Engineering and Installation Services [Member]
Revenue, Remaining Performance Obligation, Amount	$ 463,800
Difference Between Work Performed On Open Contracts And Contractual Billing Terms [Member]
Increase (Decrease) in Contract with Customer, Asset		1,100
Increase (Decrease) in Contract with Customer, Liability		$ 100
Product and Services [Member]
Revenue Recognized, Percent	90.20%	89.40%	91.30%
Product [Member]
Revenue Recognized, Percent	9.80%	10.60%	8.70%
Accounting Standards Update 2014-09 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Retained Earnings (Accumulated Deficit), Ending Balance				$ (300)

Note 3 - Revenues 2 (Details Te

Note 3 - Revenues 2 (Details Textual) - Construction, Engineering and Installation Services [Member] $ in Millions	Dec. 31, 2020USD ($)
Revenue, Remaining Performance Obligation, Amount	$ 463.8
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Amount	$ 448.8
Revenue, Remaining Performance Obligation, Percentage	96.80%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Month)	12 months

Note 3 - Revenues - Disaggregat

Note 3 - Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues	[1]	$ 807,764	$ 885,887	$ 997,861
Fixed-price Contract [Member]
Revenues		675,521	726,929	852,859
Time-and-materials Contract [Member]
Revenues		52,713	65,084	58,372
Product Sales [Member]
Revenues		79,499	93,631	84,181
License Fees [Member]
Revenues		31	243	2,449
Infrastructure Solutions [Member]
Revenues		562,571	590,797	604,121
Infrastructure Solutions [Member] | Fixed-price Contract [Member]
Revenues		513,187	523,042	556,642
Infrastructure Solutions [Member] | Time-and-materials Contract [Member]
Revenues		0	0	0
Infrastructure Solutions [Member] | Product Sales [Member]
Revenues		49,353	67,512	45,030
Infrastructure Solutions [Member] | License Fees [Member]
Revenues		31	243	2,449
Corrosion Protection [Member]
Revenues		245,193	295,090	393,740
Corrosion Protection [Member] | Fixed-price Contract [Member]
Revenues		162,334	203,887	296,217
Corrosion Protection [Member] | Time-and-materials Contract [Member]
Revenues		52,713	65,084	58,372
Corrosion Protection [Member] | Product Sales [Member]
Revenues		30,146	26,119	39,151
Corrosion Protection [Member] | License Fees [Member]
Revenues		0	0	0
UNITED STATES
Revenues	[1]	572,729	586,628	630,584
UNITED STATES | Infrastructure Solutions [Member]
Revenues		443,196	427,220	430,187
UNITED STATES | Corrosion Protection [Member]
Revenues		129,533	159,408	200,397
CANADA
Revenues	[1]	118,253	123,033	133,612
CANADA | Infrastructure Solutions [Member]
Revenues		69,190	65,370	62,292
CANADA | Corrosion Protection [Member]
Revenues		49,063	57,663	71,320
Europe [Member]
Revenues	[1]	37,251	64,278	66,794
Europe [Member] | Infrastructure Solutions [Member]
Revenues		23,782	49,157	54,567
Europe [Member] | Corrosion Protection [Member]
Revenues		13,469	15,121	12,227
Other Foreign Countries [Member]
Revenues	[1]	79,531	111,948	166,871
Other Foreign Countries [Member] | Infrastructure Solutions [Member]
Revenues		26,403	49,050	57,075
Other Foreign Countries [Member] | Corrosion Protection [Member]
Revenues		$ 53,128	$ 62,898	$ 109,796
[1]	Attributed to the country of origin.

Note 3 - Revenues- Contract Ass

Note 3 - Revenues- Contract Assets (Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	[1]	Dec. 31, 2019	[2]
Contract assets – current	$ 44,026		$ 42,973
Contract liabilities – current	(37,569)		(37,517)
Net contract assets	$ 6,457		$ 5,456
[1]	Amounts exclude contract assets of $9.3 million and contract liabilities of $0.2 million that were classified as held for sale at December 31, 2020 (see Note 6).
[2]	Amounts exclude contract assets of $13.5 million and contract liabilities of less than $0.2 million that were classified as held for sale at December 31, 2019 (see Note 6).

Note 4 - Restructuring (Details

Note 4 - Restructuring (Details Textual) $ in Thousands	3 Months Ended	12 Months Ended							41 Months Ended
	Dec. 31, 2019	Dec. 31, 2020USD ($)		Dec. 31, 2019USD ($)		Dec. 31, 2018USD ($)		Dec. 31, 2017USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2020USD ($)
Expected Restructuring Cash Charges Related to COVID-19		$ 2,000							$ 2,000	$ 2,000
Restructuring Charges, Non-Cash		1,202		$ 12,717		$ 13,814
Restructuring 2017 [Member]
Restructuring Charges Pre Tax										188,700
Restructuring Charges, Net of Tax										171,600
Payments for Restructuring		16,016	[1]	13,845	[1]	14,800	[1]			57,300
Restructuring Reserve, Settled without Cash		4,801	[2]	$ 12,782	[2]	17,372	[2]			$ 131,400
Restructuring and Related Cost, Number of Positions Eliminated									830
Downsize Operation in US [Member]
Restructuring and Related Cost, Number of Office Closed	3
Restructuring and Related Cost, Number of Offices Exiting Capital Intensive Drilling Activities	4
Restructuring and Related Cost, Number of Positions Eliminated, Period Percent				20.00%
Restructuring and Related Cost, Contributed To Cathodic Protection Domestic Revenue, Percentage				20.00%
Restructuring Charges Related to Goodwill and Long-lived Asset Impairment Charges [Member] | Restructuring 2017 [Member]
Restructuring Reserve, Settled without Cash								$ 86,400
Allowance, Write-offs and Long-lived Assets, Impairment of Intangible Assets and Net Losses On Disposal of Entities [Member] | Restructuring 2017 [Member]
Restructuring Reserve, Settled without Cash		45,000
Severance, Other Termination Benefit Costs and Contract Termination Costs [Member] | Restructuring 2017 [Member]
Restructuring and Related Costs, Incurred Cost, Total		4,200		$ 8,200		6,700
Restructuring 2017 [Member]
Restructuring Charges, Cash		12,000		19,500		12,100
Restructuring Charges, Non-Cash		4,700		12,800		17,400
Restructuring Cost Related to Discontinued Operations [Member]
Restructuring Reserve, Settled without Cash		$ 3,600		$ 100		$ 0
[1]	Refers to cash utilized to settle charges during the year.
[2]	Includes non-cash charges from discontinued operations of $3.6 million, $0.1 million and zero in 2020, 2019 and 2018, respectively.

Note 4 - Restructuring - Pre Ta

Note 4 - Restructuring - Pre Tax Restructuring Cost (Details) - Restructuring 2017 [Member] - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Restructuring charges		$ 16,737	[1]	$ 32,341	[2]	$ 29,486	[3]
Continuing Operations [Member]
Restructuring charges		11,279		30,680		29,224
Discontinued Operations [Member]
Restructuring charges		5,458		1,661		262
Discontinued Operations, Disposed of by Sale [Member]
Restructuring charges		5,458
Cost of Revenues [Member]
Restructuring charges		2,021	[1]	2,338	[2]	1,881	[3]
Cost of Revenues [Member] | Continuing Operations [Member]
Restructuring charges		2,021		2,338		1,881
Cost of Revenues [Member] | Discontinued Operations [Member]
Restructuring charges				0		0
Cost of Revenues [Member] | Discontinued Operations, Disposed of by Sale [Member]
Restructuring charges		0
Operating Expense [Member]
Restructuring charges		5,950	[1]	9,924	[2]	13,155	[3]
Operating Expense [Member] | Continuing Operations [Member]
Restructuring charges		5,950		9,924		13,155
Operating Expense [Member] | Discontinued Operations [Member]
Restructuring charges				0		0
Operating Expense [Member] | Discontinued Operations, Disposed of by Sale [Member]
Restructuring charges		0
Restructuring and Related Charges [Member]
Restructuring charges		4,162	[1]	8,188	[2]	6,660	[3]
Restructuring and Related Charges [Member] | Continuing Operations [Member]
Restructuring charges		4,162		8,188		6,660
Restructuring and Related Charges [Member] | Discontinued Operations [Member]
Restructuring charges				0		0
Restructuring and Related Charges [Member] | Discontinued Operations, Disposed of by Sale [Member]
Restructuring charges		0
Goodwill Impairment [Member]
Restructuring charges	[3]					1,389
Goodwill Impairment [Member] | Continuing Operations [Member]
Restructuring charges						1,389
Goodwill Impairment [Member] | Discontinued Operations [Member]
Restructuring charges						0
Other Expense [Member]
Restructuring charges		(854)	[1]	10,230	[2]	3,970	[3]
Other Expense [Member] | Continuing Operations [Member]
Restructuring charges		(854)		10,230		3,970
Other Expense [Member] | Discontinued Operations [Member]
Restructuring charges				0		0
Other Expense [Member] | Discontinued Operations, Disposed of by Sale [Member]
Restructuring charges		0
Definite-lived Intangible Asset Impairment [Member]
Restructuring charges	[3]					2,169
Definite-lived Intangible Asset Impairment [Member] | Continuing Operations [Member]
Restructuring charges						2,169
Definite-lived Intangible Asset Impairment [Member] | Discontinued Operations [Member]
Restructuring charges						0
Income (Loss) from Discontinued Operations [Member]
Restructuring charges		5,458	[1]	1,661	[2]	262	[3]
Income (Loss) from Discontinued Operations [Member] | Discontinued Operations [Member]
Restructuring charges				1,661		262
Income (Loss) from Discontinued Operations [Member] | Discontinued Operations, Disposed of by Sale [Member]
Restructuring charges		5,458
Employee Severance [Member]
Restructuring charges		4,597		6,355		4,536
Employee Severance [Member] | Continuing Operations [Member]
Restructuring charges		4,026		5,802		4,302
Employee Severance [Member] | Discontinued Operations [Member]
Restructuring charges		571		553		234
Contract Termination [Member]
Restructuring charges		99		2,022		2,174
Contract Termination [Member] | Continuing Operations [Member]
Restructuring charges		(100)		1,788		2,174
Contract Termination [Member] | Discontinued Operations [Member]
Restructuring charges		199		234		0
Employee Relocation [Member]
Restructuring charges		270		653		184
Employee Relocation [Member] | Continuing Operations [Member]
Restructuring charges		236		598		184
Employee Relocation [Member] | Discontinued Operations [Member]
Restructuring charges		34		55		0
Other Restructuring [Member]
Restructuring charges		11,771	[4]	23,311	[5]	22,592	[6]
Other Restructuring [Member] | Continuing Operations [Member]
Restructuring charges		7,117	[4]	22,492	[5]	22,564	[6]
Other Restructuring [Member] | Discontinued Operations [Member]
Restructuring charges		4,654	[4]	819	[5]	28	[6]
Corporate, Non-Segment [Member]
Restructuring charges		3,203		6,041		1,637
Corporate, Non-Segment [Member] | Cost of Revenues [Member]
Restructuring charges		0		0		0
Corporate, Non-Segment [Member] | Operating Expense [Member]
Restructuring charges		2,360		3,444		1,317
Corporate, Non-Segment [Member] | Restructuring and Related Charges [Member]
Restructuring charges		324		1,783		320
Corporate, Non-Segment [Member] | Goodwill Impairment [Member]
Restructuring charges						0
Corporate, Non-Segment [Member] | Other Expense [Member]
Restructuring charges		519		814		0
Corporate, Non-Segment [Member] | Definite-lived Intangible Asset Impairment [Member]
Restructuring charges						0
Corporate, Non-Segment [Member] | Employee Severance [Member]
Restructuring charges		324		1,685		170
Corporate, Non-Segment [Member] | Contract Termination [Member]
Restructuring charges		0		98		150
Corporate, Non-Segment [Member] | Employee Relocation [Member]
Restructuring charges		0		0		0
Corporate, Non-Segment [Member] | Other Restructuring [Member]
Restructuring charges		2,879	[4]	4,258	[5]	1,317	[6]
Infrastructure Solutions [Member] | Operating Segments [Member]
Restructuring charges		(1,432)		15,371		18,532
Infrastructure Solutions [Member] | Operating Segments [Member] | Cost of Revenues [Member]
Restructuring charges		69		469		1,281
Infrastructure Solutions [Member] | Operating Segments [Member] | Operating Expense [Member]
Restructuring charges		(357)		5,349		7,291
Infrastructure Solutions [Member] | Operating Segments [Member] | Restructuring and Related Charges [Member]
Restructuring charges		194		1,729		5,221
Infrastructure Solutions [Member] | Operating Segments [Member] | Goodwill Impairment [Member]
Restructuring charges						1,389
Infrastructure Solutions [Member] | Operating Segments [Member] | Other Expense [Member]
Restructuring charges		(1,338)		7,824		2,480
Infrastructure Solutions [Member] | Operating Segments [Member] | Definite-lived Intangible Asset Impairment [Member]
Restructuring charges						870
Infrastructure Solutions [Member] | Operating Segments [Member] | Employee Severance [Member]
Restructuring charges		29		938		3,038
Infrastructure Solutions [Member] | Operating Segments [Member] | Contract Termination [Member]
Restructuring charges		66		601		1,999
Infrastructure Solutions [Member] | Operating Segments [Member] | Employee Relocation [Member]
Restructuring charges		99		190		184
Infrastructure Solutions [Member] | Operating Segments [Member] | Other Restructuring [Member]
Restructuring charges		(1,626)	[4]	13,642	[5]	13,311	[6]
Corrosion Protection [Member] | Operating Segments [Member]
Restructuring charges		9,508		9,268		9,055
Corrosion Protection [Member] | Operating Segments [Member] | Cost of Revenues [Member]
Restructuring charges		1,952		1,869		600
Corrosion Protection [Member] | Operating Segments [Member] | Operating Expense [Member]
Restructuring charges		3,947		1,131		4,547
Corrosion Protection [Member] | Operating Segments [Member] | Restructuring and Related Charges [Member]
Restructuring charges		3,644		4,676		1,119
Corrosion Protection [Member] | Operating Segments [Member] | Goodwill Impairment [Member]
Restructuring charges						0
Corrosion Protection [Member] | Operating Segments [Member] | Other Expense [Member]
Restructuring charges		(35)		1,592		1,490
Corrosion Protection [Member] | Operating Segments [Member] | Definite-lived Intangible Asset Impairment [Member]
Restructuring charges						1,299
Corrosion Protection [Member] | Operating Segments [Member] | Employee Severance [Member]
Restructuring charges		3,673		3,179		1,094
Corrosion Protection [Member] | Operating Segments [Member] | Contract Termination [Member]
Restructuring charges		(166)		1,089		25
Corrosion Protection [Member] | Operating Segments [Member] | Employee Relocation [Member]
Restructuring charges		137		408		0
Corrosion Protection [Member] | Operating Segments [Member] | Other Restructuring [Member]
Restructuring charges		$ 5,864	[4]	$ 4,592	[5]	$ 7,936	[6]
[1]	Total pre-tax restructuring charges include cash charges of $12.0 million and non-cash charges of $4.7 million. Cash charges consist of charges incurred during the year that will be settled in cash, either during the current period or future periods.
[2]	Total pre-tax restructuring charges include cash charges of $19.5 million and non-cash charges of $12.8 million. Cash charges consist of charges incurred during the year that will be settled in cash, either during the current period or future periods.
[3]	Total pre-tax restructuring charges include cash charges of $12.1 million and non-cash charges of $17.4 million. Cash charges consist of charges incurred during the year that will be settled in cash, either during the current period or future periods.
[4]	Includes charges primarily related to certain wind-down costs, allowances for accounts receivable, fixed asset disposals, release of cumulative currency translation adjustments and other restructuring-related costs in connection with optimizing the cathodic protection operations in North America, exiting the CIPP operations in Europe, disposing of certain international businesses and other cost savings initiatives. Amounts also include goodwill and definite-lived intangible asset impairments related to exiting a small business in discontinued operations.
[5]	Includes charges primarily related to certain wind-down costs, inventory obsolescence, fixed asset disposals, release of cumulative currency translation adjustments and other restructuring-related costs in connection with exiting or divesting the CIPP operations in Europe and Australia, exiting the cathodic protection operations in the Middle East and right-sizing the cathodic protection services operation in North America.
[6]	Includes charges primarily related to certain wind-down costs, allowances for accounts receivable, fixed asset disposals and other restructuring-related costs in connection with exiting non-pipe-related contract applications for the Tyfo® system in North America, divesting the CIPP operations in Australia and Denmark, and exiting the cathodic protection operations in the Middle East. Amounts also include goodwill and definite-lived intangible asset impairments related to Denmark and definite-lived intangible asset impairments related to the cathodic protection operations in the Middle East.

Note 4 - Restructuring - Recogn

Note 4 - Restructuring - Recognized Cost Restructuring Activities (Details) - Restructuring 2017 [Member] - USD ($) $ in Thousands		12 Months Ended						41 Months Ended
		Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2020
Restructuring reserve, balance		$ 8,088		$ 2,412		$ 5,189
Restructuring charges		16,737	[1]	32,341	[2]	29,486	[3]
Restructuring reserve, foreign currency translation		(1)		(38)		(91)
Restructuring reserve, settled with cash		16,016	[4]	13,845	[4]	14,800	[4]	$ 57,300
Restructuring reserve, settled without cash		4,801	[5]	12,782	[5]	17,372	[5]	131,400
Restructuring reserve, balance		4,007		8,088		2,412		4,007
Employee Severance [Member]
Restructuring reserve, balance		4,389		1,742		3,864
Restructuring charges		4,597		6,355		4,536
Restructuring reserve, foreign currency translation		(30)		(11)		(69)
Restructuring reserve, settled with cash	[4]	7,179		3,697		6,589
Restructuring reserve, settled without cash	[5]	0		0		0
Restructuring reserve, balance		1,777		4,389		1,742		1,777
Contract Termination [Member]
Restructuring reserve, balance		953		359		650
Restructuring charges		99		2,022		2,174
Restructuring reserve, foreign currency translation		(7)		(20)		(19)
Restructuring reserve, settled with cash	[4]	1,020		1,408		2,446
Restructuring reserve, settled without cash	[5]	0		0		0
Restructuring reserve, balance		25		953		359		25
Employee Relocation [Member]
Restructuring reserve, balance		367		0		0
Restructuring charges		270		653		184
Restructuring reserve, foreign currency translation		1		(3)		0
Restructuring reserve, settled with cash	[4]	515		283		184
Restructuring reserve, settled without cash	[5]	0		0		0
Restructuring reserve, balance		123		367		0		123
Other Restructuring [Member]
Restructuring reserve, balance		2,379		311		675
Restructuring charges		11,771	[6]	23,311	[7]	22,592	[8]
Restructuring reserve, foreign currency translation		35		(4)		(3)
Restructuring reserve, settled with cash	[4]	7,302		8,457		5,581
Restructuring reserve, settled without cash	[5]	4,801		12,782		17,372
Restructuring reserve, balance		$ 2,082		$ 2,379		$ 311		$ 2,082
[1]	Total pre-tax restructuring charges include cash charges of $12.0 million and non-cash charges of $4.7 million. Cash charges consist of charges incurred during the year that will be settled in cash, either during the current period or future periods.
[2]	Total pre-tax restructuring charges include cash charges of $19.5 million and non-cash charges of $12.8 million. Cash charges consist of charges incurred during the year that will be settled in cash, either during the current period or future periods.
[3]	Total pre-tax restructuring charges include cash charges of $12.1 million and non-cash charges of $17.4 million. Cash charges consist of charges incurred during the year that will be settled in cash, either during the current period or future periods.
[4]	Refers to cash utilized to settle charges during the year.
[5]	Includes non-cash charges from discontinued operations of $3.6 million, $0.1 million and zero in 2020, 2019 and 2018, respectively.
[6]	Includes charges primarily related to certain wind-down costs, allowances for accounts receivable, fixed asset disposals, release of cumulative currency translation adjustments and other restructuring-related costs in connection with optimizing the cathodic protection operations in North America, exiting the CIPP operations in Europe, disposing of certain international businesses and other cost savings initiatives. Amounts also include goodwill and definite-lived intangible asset impairments related to exiting a small business in discontinued operations.
[7]	Includes charges primarily related to certain wind-down costs, inventory obsolescence, fixed asset disposals, release of cumulative currency translation adjustments and other restructuring-related costs in connection with exiting or divesting the CIPP operations in Europe and Australia, exiting the cathodic protection operations in the Middle East and right-sizing the cathodic protection services operation in North America.
[8]	Includes charges primarily related to certain wind-down costs, allowances for accounts receivable, fixed asset disposals and other restructuring-related costs in connection with exiting non-pipe-related contract applications for the Tyfo® system in North America, divesting the CIPP operations in Australia and Denmark, and exiting the cathodic protection operations in the Middle East. Amounts also include goodwill and definite-lived intangible asset impairments related to Denmark and definite-lived intangible asset impairments related to the cathodic protection operations in the Middle East.

Note 5 - Supplemental Balance_3

Note 5 - Supplemental Balance Sheet Information (Details Textual) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounts Receivable, Credit Loss Expense (Reversal)	[1]	$ 500	$ (1,930)	$ 8,188
Depreciation, Total		19,300	19,300	21,000
Restructuring 2016 and 2017 [Member]
Accounts Receivable, Credit Loss Expense (Reversal)		$ 500	$ (100)	$ 5,300
[1]	The Company recorded bad debt expense (reversals) of $0.5 million, less than ($0.1) million and $5.3 million in 2020, 2019 and 2018, respectively, as part of the restructuring efforts (see Note 4) and was primarily due to the exiting of certain low-return businesses mainly in foreign locations.

Note 5 - Supplemental Balance_4

Note 5 - Supplemental Balance Sheet Information - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Balance, beginning of year		$ 6,404	$ 9,546	$ 5,428
Provision for expected credit losses, net of recoveries (1)	[1]	500	(1,930)	8,188
Amounts written off and adjustments		(2,900)	(1,212)	(4,070)
Balance, end of year		$ 4,004	$ 6,404	$ 9,546
[1]	The Company recorded bad debt expense (reversals) of $0.5 million, less than ($0.1) million and $5.3 million in 2020, 2019 and 2018, respectively, as part of the restructuring efforts (see Note 4) and was primarily due to the exiting of certain low-return businesses mainly in foreign locations.

Note 5 - Supplemental Balance_5

Note 5 - Supplemental Balance Sheet Information - Inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Raw materials and supplies	$ 21,770	$ 27,415
Work-in-process	5,377	5,739
Finished products	8,413	14,937
Construction materials	9,329	9,102
Total	$ 44,889	$ 57,193

Note 5 - Supplemental Balance_6

Note 5 - Supplemental Balance Sheet Information - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment, Gross	$ 278,398	$ 272,335
Less – Accumulated depreciation	(185,498)	(177,449)
Property, plant & equipment, less accumulated depreciation	92,900	94,886
Land and Land Improvements [Member]
Property, Plant and Equipment, Gross	$ 7,851	6,703
Land and Land Improvements [Member] | Minimum [Member]
Estimated Useful Lives (Year)	5 years
Land and Land Improvements [Member] | Maximum [Member]
Estimated Useful Lives (Year)	40 years
Land, Buildings and Improvements [Member]
Property, Plant and Equipment, Gross	$ 48,190	49,084
Land, Buildings and Improvements [Member] | Minimum [Member]
Estimated Useful Lives (Year)	4 years
Land, Buildings and Improvements [Member] | Maximum [Member]
Estimated Useful Lives (Year)	10 years
Machinery and Equipment [Member]
Property, Plant and Equipment, Gross	$ 139,844	131,956
Machinery and Equipment [Member] | Minimum [Member]
Estimated Useful Lives (Year)	3 years
Machinery and Equipment [Member] | Maximum [Member]
Estimated Useful Lives (Year)	10 years
Furniture and Fixtures [Member]
Property, Plant and Equipment, Gross	$ 31,188	31,860
Furniture and Fixtures [Member] | Minimum [Member]
Estimated Useful Lives (Year)	3 years
Furniture and Fixtures [Member] | Maximum [Member]
Estimated Useful Lives (Year)	10 years
Vehicles [Member]
Property, Plant and Equipment, Gross	$ 45,768	45,496
Construction in Progress [Member]
Property, Plant and Equipment, Gross	$ 5,557	$ 7,236

Note 5 - Supplemental Balance_7

Note 5 - Supplemental Balance Sheet Information - Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Vendor and other accrued expenses	$ 17,152	$ 26,313
Estimated casualty and healthcare liabilities	10,624	10,702
Job costs	13,416	12,041
Accrued compensation	17,112	17,045
Income taxes payable	1,360	1,751
Total	$ 59,664	$ 67,852

Note 6 - Discontinued Operati_3

Note 6 - Discontinued Operations and Assets and Liabilities Held for Sale (Details Textual) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Sep. 30, 2020
Goodwill, Impairment Loss		$ 0	$ 0	$ 1,389
Impairment of Long-Lived Assets to be Disposed of	$ 1,300	1,259	23,427	$ 0
Infrastructure Solutions [Member]
Impairment of Long-Lived Assets to be Disposed of			17,600
Corrosion Protection [Member]
Impairment of Long-Lived Assets to be Disposed of			2,900
Corporate Segment [Member]
Impairment of Long-Lived Assets to be Disposed of			$ 2,900
Energy Services [Member] | Discontinued Operations, Held-for-sale [Member]
Goodwill, Impairment Loss	$ 7,300
Energy Services [Member] | Discontinued Operations, Held-for-sale [Member] | Minimum [Member]
Disposal Group, Including Discontinued Operation, Divestiture Costs		2,000
Energy Services [Member] | Discontinued Operations, Held-for-sale [Member] | Maximum [Member]
Disposal Group, Including Discontinued Operation, Divestiture Costs		$ 3,000
Energy Services [Member] | Weighted Average Cost of Capital [Member] | Discontinued Operations, Held-for-sale [Member]
Goodwill, Measurement Input	0.170	0.170			0.150

Note 6 - Discontinued Operati_4

Note 6 - Discontinued Operations and Assets and Liabilities Held for Sale - Discontinued Operations (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Net income (loss) from discontinued operations				$ (55,156)		$ 4,542		$ 5,859
Disposal Group, Including Discontinued Operation, Contract Assets, Current		$ 9,300		9,300		13,500
Total current assets		92,850		92,850		168,799		162,236
Impairment of assets held for sale		(1,300)		(1,259)		(23,427)		0
Disposal Group, Including Discontinued Operation, Contract Liabilities, Current		200		200		200
Total current liabilities		36,148		36,148		37,900
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Receivables, net		26,901	[1]	26,901	[1]	43,256	[2]
Retainage		203	[1]	203	[1]	518	[2]
Disposal Group, Including Discontinued Operation, Contract Assets, Current		9,330	[1]	9,330	[1]	13,469	[2]
Inventories		60	[1]	60	[1]	2,097	[2]
Prepaid expenses and other current assets		2,652	[1]	2,652	[1]	3,379	[2]
Total current assets		39,146	[1]	39,146	[1]	62,719	[2]
Property, plant & equipment, less accumulated depreciation		7,962	[1]	7,962	[1]	17,167	[2]
Goodwill		2,640	[1]	2,640	[1]	52,201	[2]
Intangible assets, less accumulated amortization		33,718	[1]	33,718	[1]	38,481	[2]
Operating lease assets		8,734	[1]	8,734	[1]	11,546	[2]
Other non-current assets		650	[1]	650	[1]	663	[2]
Impairment of assets held for sale				0	[1]	(13,978)	[2]
Total assets held for sale		92,850	[1]	92,850	[1]	168,799	[2]
Accounts payable		5,211	[1]	5,211	[1]	8,688	[2]
Accrued expenses		20,927	[1]	20,927	[1]	16,707	[2]
Operating lease liabilities		2,301	[1]	2,301	[1]	1,775	[2]
Disposal Group, Including Discontinued Operation, Contract Liabilities, Current		165	[1]	165	[1]	167	[2]
Total current liabilities		28,604	[1]	28,604	[1]	27,337	[2]
Operating lease liabilities		7,348		7,348		10,368
Other non-current liabilities		196	[1]	196	[1]	195	[2]
Total liabilities held for sale		$ 36,148	[1]	36,148	[1]	37,900	[2]
Energy Services [Member] | Discontinued Operations, Held-for-sale [Member]
Revenues				271,529		328,048		335,707
Cost of revenues				247,453		286,814		294,160
Gross profit				24,076		41,234		41,547
Operating expenses				28,455		30,652		31,675
Goodwill impairment				47,977		0		0
Definite-lived intangible asset impairment				957		0		0
Restructuring and related charges				804		842		234
Operating income (loss)				(54,117)		9,740		9,638
Interest expense(1)	[3]			(3,308)		(2,644)		(2,618)
Total other expense				(3,308)		(2,644)		(2,618)
Income (loss) before taxes on income				(57,425)		7,096		7,020
Taxes (benefit) on income (loss)				(2,269)		2,554		1,161
Net income (loss) from discontinued operations				$ (55,156)		$ 4,542		$ 5,859
[1]	Includes Energy Services and Environmental Techniques.
[2]	Includes Energy Services, Environmental Techniques, Insituform Australia, Insituform Spain and land held at Corporate.
[3]	The Company allocated interest expense, including a portion of the settlement amount from the Company's interest rate swaps, to its discontinued operations based on carrying value at December 31, 2020.

Note 7 - Leases (Details Textua

Note 7 - Leases (Details Textual) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Operating Lease, Liability, Total	$ 70.5
Lessee, Operating Lease, Renewal Term (Year)	5 years
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Disposal Group, Including Discontinued Operation, Operating Lease, Right-of-Use Asset 1	$ 8.7	$ 11.5
Disposal Group, Including Discontinued Operation, Accrued Expense	2.3	1.8
Disposal Group, Including Discontinued Operation, Other Liabilities	$ 7.3	$ 10.4
Minimum [Member]
Lessee, Operating Lease, Remaining Lease Term (Year)	1 year
Maximum [Member]
Lessee, Operating Lease, Remaining Lease Term (Year)	20 years

Note 7 - Leases - Lease Expense

Note 7 - Leases - Lease Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Operating lease cost	$ 19,750	$ 22,235
Short-term lease cost	24,607	25,382
Total lease cost	44,357	47,617
Operating cash flows from operating leases	19,083	22,144
Operating leases	$ 7,708	$ 18,879

Note 7 - Leases - Supplement Fi

Note 7 - Leases - Supplement Financial Statement Disclosure (Details) - USD ($) $ in Thousands	Dec. 31, 2020		Dec. 31, 2019
Operating lease assets	$ 52,421	[1]	$ 60,246	[2]
Operating lease liabilities	14,147		14,204
Other liabilities	38,724		$ 46,059
Total operating lease liabilities	$ 70,500
Weighted-average remaining lease term (Year)	4 years 10 months 6 days	[1]	5 years 8 months 26 days	[2]
Weighted-average discount rate	4.96%	[1]	5.71%	[2]
Accrued Expense [Member]
Operating lease liabilities	$ 14,147		$ 14,204
Other Liabilities [Member]
Other liabilities	38,724	[1]	46,059	[2]
Accrued Expense and Other Liabilities [Member]
Total operating lease liabilities	$ 52,871	[1]	$ 60,263	[2]
[1]	Amounts exclude operating lease assets of $8.7 million, accrued expenses of $2.3 million and other liabilities of $7.3 million that were classified as held for sale at December 31, 2020 (see Note 5).
[2]	Amounts exclude operating lease assets of $11.5 million, accrued expenses of $1.8 million and other liabilities of $10.4 million that were classified as held for sale at December 31, 2019 (see Note 5).

Note 7 - Leases - Operating Lea

Note 7 - Leases - Operating Lease Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020		Dec. 31, 2019	[2]
2021	$ 16,380
2022	13,536
2023	10,784
2024	7,511
2025	4,415
Thereafter	6,965
Total undiscounted operating lease liabilities	59,591
Less: Imputed interest	(6,720)
Total discounted operating lease liabilities	70,500
Accrued Expense and Other Liabilities [Member]
Total discounted operating lease liabilities	$ 52,871	[1]	$ 60,263
[1]	Amounts exclude operating lease assets of $8.7 million, accrued expenses of $2.3 million and other liabilities of $7.3 million that were classified as held for sale at December 31, 2020 (see Note 5).
[2]	Amounts exclude operating lease assets of $11.5 million, accrued expenses of $1.8 million and other liabilities of $10.4 million that were classified as held for sale at December 31, 2019 (see Note 5).

Note 8 - Goodwill and Intangi_3

Note 8 - Goodwill and Intangible Assets (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Amortization of Intangible Assets, Total	$ 9.4	$ 9.4	$ 9.7
Finite-Lived Intangible Asset, Expected Amortization, Year One	9.4
Finite-Lived Intangible Asset, Expected Amortization, Year Two	9.4
Finite-Lived Intangible Asset, Expected Amortization, Year Three	9.4
Finite-Lived Intangible Asset, Expected Amortization, Year Four	9.4
Finite-Lived Intangible Asset, Expected Amortization, Year Five	$ 8.5

Note 8 - Goodwill and Intangi_4

Note 8 - Goodwill and Intangible Assets - Reconciliation Goodwill (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill, gross		$ 318,913	$ 317,106	$ 320,904
Accumulated impairment losses		(108,248)	(108,248)	(108,248)
Goodwill, Ending Balance		210,665	208,858	212,656
Foreign currency translation		1,807	426
Reclassification to assets held for sale (1)	[1]		(4,224)
Infrastructure Solutions [Member]
Goodwill, gross		241,719	240,160	244,521
Accumulated impairment losses		(62,848)	(62,848)	(62,848)
Goodwill, Ending Balance		178,871	177,312	181,673
Foreign currency translation		1,559	(137)
Reclassification to assets held for sale (1)	[1]		(4,224)
Corrosion Protection [Member]
Goodwill, gross		77,194	76,946	76,383
Accumulated impairment losses		(45,400)	(45,400)	(45,400)
Goodwill, Ending Balance		31,794	31,546	$ 30,983
Foreign currency translation		$ 248	563
Reclassification to assets held for sale (1)	[1]		$ 0
[1]	During 2019, the Company classified certain assets of its CIPP contracting operation in Europe as held for sale (see Note 6).

Note 8 - Goodwill and Intangi_5

Note 8 - Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Gross carrying amount	$ 155,891	$ 155,155
Accumulated amortization	(97,022)	(87,280)
Net carrying amount	58,869	67,875
Licensing Agreements [Member]
Gross carrying amount	3,894	3,894
Accumulated amortization	(3,894)	(3,824)
Net carrying amount	0	70
Lease Agreements [Member]
Gross carrying amount	864	864
Accumulated amortization	(864)	(777)
Net carrying amount	0	87
Trademarks [Member]
Gross carrying amount	14,758	14,688
Accumulated amortization	(7,459)	(6,695)
Net carrying amount	$ 7,299	7,993
Weighted average useful lives (Year)	8 years 4 months 24 days
Noncompete Agreements [Member]
Gross carrying amount	$ 1,561	1,556
Accumulated amortization	(1,008)	(784)
Net carrying amount	$ 553	772
Weighted average useful lives (Year)	2 years 3 months 18 days
Customer Relationships [Member]
Gross carrying amount	$ 95,058	94,865
Accumulated amortization	(56,602)	(50,104)
Net carrying amount	$ 38,456	44,761
Weighted average useful lives (Year)	5 years 8 months 12 days
Patents [Member]
Gross carrying amount	$ 39,756	39,288
Accumulated amortization	(27,195)	(25,096)
Net carrying amount	$ 12,561	$ 14,192
Weighted average useful lives (Year)	6 years 10 months 24 days

Note 9 - Long-term Debt and C_3

Note 9 - Long-term Debt and Credit Facility (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Mar. 12, 2018	Oct. 31, 2015
Long-term Debt, Total	$ 222,467	$ 278,520	$ 278,520
Payments of Financing Costs, Total	1,995		0	$ 1,657
Repayments of Lines of Credit		700
Long-term Debt, Fair Value	219,200	286,800	286,800
Derivative, Fixed Interest Rate					2.937%
A 2015 Interest Rate Swap [Member]
Derivative Asset, Notional Amount						$ 262,500
Derivative, Fixed Interest Rate						1.46%
A 2018 Interest Rate Swap [Member]
Derivative Asset, Notional Amount					$ 170,600
Derivative, Fixed Interest Rate					2.937%
Derivative, Amount of Hedged Item					$ 170,600
Term Loan [Member]
Long-term Debt, Total	$ 221,700	253,800	253,800
The 2015 Credit Facility [Member]
Debt Instrument, Face Amount						$ 650,000
Line of Credit Facility, Maximum Borrowing Capacity						350,000
Debt Instrument, LIBOR Floor	0.25%
Other Loans Payable, Total	$ 700	800	800
Letters of Credit Outstanding, Amount	$ 30,800
Long-term Line of Credit, Total		$ 24,000	$ 24,000
Derivative, Amount of Hedged Item						$ 262,500
Credit Facility Maximum Consolidated Leverage Ratio	3.50
Credit Facility Actual Consolidated Leverage Ratio	2.32
Line of Credit Facility, Remaining Borrowing Capacity	$ 118,200
Credit Facility Minimum Consolidated Fixed Charge Ratio	1.15
Credit Facility Actual Consolidated Fixed Charge Ratio	1.40
The 2015 Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	2.00%
The 2015 Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate	1.25%
The 2015 Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate	3.25%
The 2015 Credit Facility [Member] | Term Loan [Member]
Long-term Debt, Total	$ 308,400
Debt Instrument, Interest Rate, Effective Percentage	4.09%
The 2015 Credit Facility [Member] | Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 175,000
Payments of Financing Costs, Total	2,200			3,100
Line Of Credit Facility, Unamortized Loan Costs	1,900			2,400
Interest Expense, Debt, Total	200			600
Repayments of Long-term Lines of Credit	24,000
The 2015 Credit Facility [Member] | Revolving Credit Facility [Member] | Up-front Lending Fees [Member]
Payments of Financing Costs, Total	1,700			1,400
The 2015 Credit Facility [Member] | Revolving Credit Facility [Member] | Third-party Arranging Fees and Expenses [Member]
Payments of Financing Costs, Total	500			$ 1,700
The 2015 Credit Facility [Member] | Insurance Carries Collateral [Member]
Letters of Credit Outstanding, Amount	11,200
The 2015 Credit Facility [Member] | Working Performance Obligation [Member]
Letters of Credit Outstanding, Amount	$ 19,600

Note 9 - Long-term Debt and C_4

Note 9 - Long-term Debt and Credit Facility - Long-term Debt (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Long term debt	$ 222,467,000	$ 278,520,000
Less – Current maturities of long-term debt	25,811,000	32,803,000
Less – Unamortized loan costs	2,668,000	2,088,000
Total	193,988,000	243,629,000
Medium-term Notes [Member]
Long term debt	221,717,000	253,750,000
Line of Credit [Member]
Long term debt	0	24,000
Notes Payable, Other Payables [Member]
Long term debt	$ 750,000	$ 770,000

Note 9 - Long-term Debt and C_5

Note 9 - Long-term Debt and Credit Facility - Long-term Debt (Details) (Parentheticals)	Dec. 31, 2020	Dec. 31, 2019
Medium-term Notes [Member]
Current effective interest rate	2.00%	4.09%
Line of Credit [Member]
Current effective interest rate	2.00%	4.01%
Notes Payable, Other Payables [Member] | Minimum [Member]
Current effective interest rate	3.30%	3.30%
Notes Payable, Other Payables [Member] | Maximum [Member]
Current effective interest rate	7.80%	7.80%

Note 9 - Long-term Debt and C_6

Note 9 - Long-term Debt and Credit Facility - Debt Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
2021	$ 25,811
2022	30,844
2023	165,812
2024	0
2025	0
Thereafter	0
Total	$ 222,467	$ 278,520

Note 10 - Stockholders' Equity

Note 10 - Stockholders' Equity (Details Textual) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020USD ($)$ / sharesshares	Dec. 31, 2019USD ($)$ / sharesshares	Dec. 31, 2018USD ($)$ / sharesshares	Apr. 30, 2019shares	Apr. 30, 2018shares	Dec. 31, 2017shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)	1,043,607	1,034,964	1,143,205			1,428,878
A 2016 Employee Plan [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)				300,000	1,700,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)	1,451,672
A 2016 Director Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)	250,980
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)	163,973
A 2011 Director Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)	51,842
A 2006 Director Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)	29,529
A 2001 Director Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)	19,125
Share-based Payment Arrangement, Option [Member]
Stock Repurchased During Period, Shares (in shares)		48,409
Stock Repurchased During Period, Value | $		$ 1
Stock Repurchase Program, Average Cost Per Share (in dollars per share) | $ / shares		$ 20.52
Amended Credit Facility [Member]
Credit Facility Minimum Consolidated Leverage Ratio	2.50	2.50
Stock Repurchase Program, Authorized Amount | $	$ 40
Share Repurchase Program 2019 [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)		2,000,000
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in shares)	2,000,000
Share Repurchase Program 2018 [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)			2,000,000
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in shares)	125,975
In Connection With Equity Compensation Programs [Member]
Stock Repurchase Program, Authorized Amount | $	$ 10
Stock Repurchased During Period, Shares (in shares)	122,292	151,234	228,068
Stock Repurchased During Period, Value | $	$ 2.5	$ 3.1	$ 5.5
Stock Repurchase Program, Average Cost Per Share (in dollars per share) | $ / shares	$ 20.57	$ 20.26	$ 24.08
The Open Market Repurchase Program [Member]
Stock Repurchased During Period, Shares (in shares)	381,677	1,492,348	949,464
Stock Repurchased During Period, Value | $	$ 6.6	$ 26.3	$ 20.3
Stock Repurchase Program, Average Cost Per Share (in dollars per share) | $ / shares	$ 17.16	$ 17.64	$ 21.36

Note 11 - Equity-based Compen_3

Note 11 - Equity-based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Weighted Average [Member]
Share Price (in dollars per share)		$ 20.55
Current Stock Awards [Member]
Share-based Payment Arrangement, Expense	$ 8,900	$ 7,000	$ 6,800
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 9,800
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	1 year 10 months 24 days
Deferred Stock Units [Member]
Share-based Payment Arrangement, Expense	$ 1,000	700	1,100
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 300
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	3 months 18 days
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Expense	$ 0	$ 0	$ 0
Share-based Payment Arrangement, Option [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	7 years
Share-based Payment Arrangement, Option [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	10 years

Note 11 - Equity-based Compen_4

Note 11 - Equity-based Compensation - Summary of Stock Award Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stock Awards, Outstanding (in shares)	1,034,964	1,143,205	1,428,878
Weighted average award date fair value (in dollars per share)	$ 23.20	$ 23.26	$ 21.53
Stock Awards, Outstanding (in shares)	1,043,607	1,034,964	1,143,205
Weighted average award date fair value (in dollars per share)	$ 22.40	$ 23.20	$ 23.26
Restricted Stock Units (RSUs) [Member]
Awards, grants during period (in shares)	420,377	325,321	281,567
Weighted average award date fair value, award granted (in dollars per share)	$ 19.87	$ 20.02	$ 24.13
Awards, distributed during period (in shares)	(297,322)	(237,416)	(312,182)
Weighted average award date fair value, award distributed (in dollars per share)	$ 20.50	$ 18.83	$ 17.47
Awards, forfeited during period (in shares)	(93,696)	(74,075)	(90,896)
Weighted average award date fair value, award forfeited (in dollars per share)	$ 18.17	$ 22.09	$ 21.79
Performance Shares [Member]
Awards, grants during period (in shares)	131,755	146,367	219,943
Weighted average award date fair value, award granted (in dollars per share)	$ 22.96	$ 22.78	$ 23.25
Awards, distributed during period (in shares)	(71,541)	(111,155)	(296,909)
Weighted average award date fair value, award distributed (in dollars per share)	$ 28.18	$ 25.85	$ 21.55
Awards, forfeited during period (in shares)	(80,930)	(80,597)	(87,196)
Weighted average award date fair value, award forfeited (in dollars per share)	$ 27.19	$ 25.30	$ 25.95
Restricted Stock [Member]
Awards, distributed during period (in shares)	0	(76,686)	0
Weighted average award date fair value, award distributed (in dollars per share)	$ 0	$ 18.26	$ 0

Note 11 - Equity-based Compen_5

Note 11 - Equity-based Compensation - Deferred Stock Unit Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stock Awards, Outstanding (in shares)	1,034,964	1,143,205	1,428,878
Weighted average award date fair value (in dollars per share)	$ 23.20	$ 23.26	$ 21.53
Stock Awards, Outstanding (in shares)	1,043,607	1,034,964	1,143,205
Weighted average award date fair value (in dollars per share)	$ 22.40	$ 23.20	$ 23.26
Deferred Stock Units [Member]
Stock Awards, Outstanding (in shares)	253,340	287,350	269,977
Weighted average award date fair value (in dollars per share)	$ 20.71	$ 20.80	$ 20.14
Awards, grants during period (in shares)	70,426	50,174	45,681
Weighted average award date fair value, award granted (in dollars per share)	$ 14.59	$ 19.64	$ 23.72
Awards, distributed during period (in shares)	(59,297)	(84,184)	(28,308)
Weighted average award date fair value, award distributed (in dollars per share)	$ 21.66	$ 20.38	$ 19.22
Stock Awards, Outstanding (in shares)	264,469	253,340	287,350
Weighted average award date fair value (in dollars per share)	$ 18.87	$ 20.71	$ 20.80

Note 11 - Equity-based Compen_6

Note 11 - Equity-based Compensation - Summary of Stock Option Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Outstanding, shares (in shares)	52,783	52,783	126,680
Outstanding, weighted average exercise price (in dollars per share)	$ 18.11	$ 18.11	$ 23.06
Exercised, shares (in shares)	(52,783)		0
Exercised, weighted average exercise price (in dollars per share)	$ 18.11		$ 0
Canceled/Expired, shares (in shares)	0		(73,897)
Canceled/Expired, weighted average exercise price (in dollars per share)	$ 0		$ 26.60
Outstanding,, shares (in shares)	0	52,783	52,783
Outstanding, weighted average exercise price (in dollars per share)	$ 0	$ 18.11	$ 18.11
Exercisable, shares (in shares)	0		52,783
Exercisable, weighted average exercise price (in dollars per share)	$ 0		$ 18.11

Note 11 - Equity-based Compen_7

Note 11 - Equity-based Compensation - Stock Option Exercises (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Proceeds from issuance of common stock upon stock option exercises		$ 0	$ 956	$ 0
Total intrinsic value of stock option exercises (1)	[1]		129
Tax expense (benefit) of stock option exercises recorded in income tax expense			312	$ (1,556)
Aggregate intrinsic value of outstanding stock options			0
Aggregate intrinsic value of exercisable stock options			$ 0
[1]	Calculation was based on a weighted average market price of the Company's stock at the time of exercise of $20.55 for the year ended December 31, 2019.

Note 12 - Taxes on Income (Deta

Note 12 - Taxes on Income (Details Textual) - USD ($) $ in Thousands	11 Months Ended	12 Months Ended
	Dec. 13, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	21.00%
Deferred Tax Assets, Operating Loss Carryforwards, Total		$ 15,546	$ 19,079
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration		9,000
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration		6,500
Deferred Tax Assets, Tax Credit Carryforwards, Foreign		6,152	4,101
Deferred Tax Assets, Tax Credit Carryforwards, Foreign, Not Subject to Expiration		100
Deferred Tax Assets, Tax Credit Carryforwards, General Business		1,485	844
Deferred Tax Assets, Valuation Allowance, Total		43,424	34,247
Undistributed Earnings of Foreign Subsidiaries		206,700
Unrecognized Tax Benefits that Would Impact Effective Tax Rate		300
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total		200	$ 200	$ 200
Decrease in Unrecognized Tax Benefits is Reasonably Possible		$ 900
Open Tax Year		2016 2017 2018 2019 2020
Tax Credit Expiring in 2026 [Member]
Deferred Tax Assets, Tax Credit Carryforwards, Foreign, Subject to Expiration		$ 900
Tax Credit Expiring in 2029 [Member]
Deferred Tax Assets, Tax Credit Carryforwards, Foreign, Subject to Expiration		3,700
Tax Credit Expiring in 2030 [Member]
Deferred Tax Assets, Tax Credit Carryforwards, Foreign, Subject to Expiration		1,500
Tax Credit Expiring in 2038 [Member]
Deferred Tax Assets, Tax Credit Carryforwards, General Business		200
Tax Credit Expiring in 2039 [Member]
Deferred Tax Assets, Tax Credit Carryforwards, General Business		800
Tax Credit Expiring in 2040 [Member]
Deferred Tax Assets, Tax Credit Carryforwards, General Business		$ 500

Note 12 - Taxes on Income - Inc

Note 12 - Taxes on Income - Income (Loss) Before Taxes on Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Domestic	$ 10,454	$ (3,469)	$ 1,122
Foreign	19,613	(16,511)	(5,187)
Total	$ 30,067	$ (19,980)	$ (4,065)

Note 12 - Taxes on Income - Pro

Note 12 - Taxes on Income - Provisions for Taxes on Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Federal	$ (1,683)	$ (3,116)	$ (4,902)
Foreign	5,010	5,705	6,025
State	794	49	(722)
Subtotal	4,121	2,638	401
Federal	(421)	(994)	58
Foreign	704	(199)	(1,531)
State	863	2,565	(221)
Subtotal	1,146	1,372	(1,694)
Total tax provision	$ 5,267	$ 4,010	$ (1,293)

Note 12 - Taxes on Income - Eff

Note 12 - Taxes on Income - Effective Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income taxes (benefit) at U.S. federal statutory tax rate	$ 6,315	$ (4,196)	$ (854)
State income taxes, net of federal income tax benefit	1,051	2,033	(791)
Divestitures	(501)	5,613	2,133
Meals and entertainment	271	442	482
Changes in taxes previously accrued	45	(1,557)	(573)
Foreign tax rate differences	(176)	(643)	1,301
Share-based compensation	572	358	(1,427)
Goodwill impairment	0	0	291
Recognition of uncertain tax positions	(504)	(717)	(218)
Deemed mandatory repatriation	0	0	(842)
Other matters	(588)	(1,154)	(821)
Total tax provision	$ 5,267	$ 4,010	$ (1,293)
Effective tax rate	17.50%	(20.10%)	31.80%
Foreign Tax Authority [Member]
Change in the balance of the valuation allowance for deferred tax assets allocated to foreign income tax expense	$ 38	$ 806	$ 590
Domestic Tax Authority [Member]
Change in the balance of the valuation allowance for deferred tax assets allocated to foreign income tax expense	$ (1,256)	$ 3,025	$ (564)

Note 12 - Taxes on Income - Net

Note 12 - Taxes on Income - Net Deferred Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Foreign tax credit carryforwards	$ 6,152	$ 4,101
General business credit carryforwards	1,485	844
Net operating loss carryforwards	15,546	19,079
Accrued expenses	15,047	15,119
Operating lease liabilities	15,820	17,360
Other	5,999	7,587
Total gross deferred income tax assets	60,049	64,090
Less valuation allowance	(43,424)	(34,247)
Net deferred income tax assets	16,625	29,843
Property, plant and equipment	(4,625)	(5,689)
Intangible assets	(1,009)	(12,203)
Operating lease assets	(15,464)	(17,198)
Other	5,423	4,791
Total deferred income tax liabilities	(26,521)	(39,881)
Net deferred income tax liabilities	(9,896)	(10,038)
Deferred income tax assets	448	1,216
Noncurrent deferred income tax liabilities, net	(10,344)	(11,254)
Net deferred income tax liabilities	$ 9,896	$ 10,038

Note 12 - Taxes on Income - Act

Note 12 - Taxes on Income - Activity in the Valuation Allowance (Details) - SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Balance	$ 34,247	$ 28,451	$ 29,782
Additions	14,677	8,789	1,879
Reversals	(6,571)	(6,776)	(2,102)
Other adjustments	1,071	3,783	(1,108)
Balance	$ 43,424	$ 34,247	$ 28,451

Note 12 - Taxes on Income - Unr

Note 12 - Taxes on Income - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Balance	$ 1,384	$ 1,955	$ 2,229
Additions for tax positions of prior years	51	9	8
Lapse in statute of limitations	(451)	(587)	(264)
Foreign currency translation	7	7
Foreign currency translation			(18)
Balance	$ 991	$ 1,384	$ 1,955

Note 13 - Commitments and Con_2

Note 13 - Commitments and Contingencies (Details Textual) $ in Millions	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Multiemployer Plans, Number of Participants	948
Corrpro [Member]
Defined Benefit Plan, Plan Assets, Amount, Ending Balance	$ 10.2	$ 9.1
Defined Benefit Plan, Benefit Obligation, Ending Balance	$ 9.5	8.2
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	1.30%
Corrpro [Member] | Defined Benefit Plan, Overfunded Plan [Member]
Defined Benefit Plan, Funded (Unfunded) Status of Plan, Total	$ 0.7
UNITED STATES
Defined Contribution Plan, Cost	3	5.2	$ 5.7
Foreign Plan [Member]
Defined Contribution Plan, Cost	$ 0.3	$ 0.8	$ 1.1

Note 14 - Segment and Geograp_3

Note 14 - Segment and Geographic Information (Details Textual) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2020USD ($)		Dec. 31, 2019USD ($)		Dec. 31, 2018USD ($)		Dec. 31, 2017USD ($)
Number of Operating Segments		2
Impairment of Long-Lived Assets to be Disposed of	$ 1,300	$ 1,259		$ 23,427		$ 0
Capital Expenditure, Discontinued Operations		3,000		3,400		3,100
Disposal Group, Including Discontinued Operation, Depreciation and Amortization		$ 6,800		7,500		7,100
Number of Reportable Segments		2
The 2015 Credit Facility [Member] | Revolving Credit Facility [Member]
Interest Expense, Debt, Total		$ 200				600
Corporate, Non-Segment [Member]
Impairment of Long-Lived Assets to be Disposed of		1,300		2,900
Infrastructure Solutions [Member]
Restructuring, Impairment Reversal		1,100
Impairment of Long-Lived Assets to be Disposed of				17,600
Corrosion Protection [Member]
Impairment of Long-Lived Assets to be Disposed of				2,900
Interest Expense [Member] | The 2015 Credit Facility [Member] | Revolving Credit Facility [Member]
Interest Expense, Debt, Total		700				2,300
Restructuring 2017 [Member]
Restructuring Charges, Total		16,737	[1]	32,341	[2]	29,486	[3]
Restructuring 2017 [Member] | Corporate, Non-Segment [Member]
Restructuring Charges, Total		3,203		6,041		1,637
Restructuring 2017 [Member] | Operating Income (Loss) [Member] | Corporate, Non-Segment [Member]
Restructuring Charges, Total		2,700		5,200		1,600
Restructuring 2017 [Member] | Operating Income (Loss) [Member] | Divestiture of International Operations [Member] | Corporate, Non-Segment [Member]
Restructuring Charges, Total		3,200		2,200		4,100
Restructuring 2017 [Member] | Operating Income (Loss) [Member] | Infrastructure Solutions [Member]
Restructuring Charges, Reversal of Expense		100
Restructuring Charges, Total				7,500		16,100
Restructuring 2017 [Member] | Operating Income (Loss) [Member] | Infrastructure Solutions [Member] | Divestiture of International Operations [Member]
Restructuring Charges, Total		400		1,000		400
Restructuring 2017 [Member] | Operating Income (Loss) [Member] | Corrosion Protection [Member]
Restructuring Charges, Total		9,500		7,700		7,600
Restructuring 2017 [Member] | Operating Income (Loss) [Member] | Corrosion Protection [Member] | Divestiture of International Operations [Member]
Restructuring Charges, Total				100		2,500
Restructuring 2017 [Member] | Other Nonoperating Income (Expense) [Member]
Restructuring Charges, Total		$ 900		$ 10,200				$ 4,000
Restructuring 2017 [Member] | Other Nonoperating Income (Expense) [Member] | Bayou [Member]
Restructuring Charges, Total						$ 7,000
[1]	Total pre-tax restructuring charges include cash charges of $12.0 million and non-cash charges of $4.7 million. Cash charges consist of charges incurred during the year that will be settled in cash, either during the current period or future periods.
[2]	Total pre-tax restructuring charges include cash charges of $19.5 million and non-cash charges of $12.8 million. Cash charges consist of charges incurred during the year that will be settled in cash, either during the current period or future periods.
[3]	Total pre-tax restructuring charges include cash charges of $12.1 million and non-cash charges of $17.4 million. Cash charges consist of charges incurred during the year that will be settled in cash, either during the current period or future periods.

Note 14 - Segment and Geograp_4

Note 14 - Segment and Geographic Information - Summary of Revenues (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues	[1]	$ 807,764	$ 885,887	$ 997,861
Gross profit	[1]	196,459	205,001	225,379
Total operating income (loss)	[1]	40,988	1,233	20,009
Interest expense	[2]	(12,483)	(11,358)	(14,709)
Interest income		1,125	1,038	516
Other	[3]	437	(10,893)	(9,881)
Total other expense		(10,921)	(21,213)	(24,074)
Income (loss) before taxes (benefit) on income (loss)		30,067	(19,980)	(4,065)
Total assets		901,447	995,513	992,417
Assets held for sale		92,850	168,799	162,236
Capital expenditures	[4]	16,559	25,335	27,461
Depreciation and amortization	[5]	28,702	28,673	30,744
Operating income (loss)	[1]	40,988	1,233	20,009
Long-lived assets	[1],[6]	101,790	104,215	128,660
UNITED STATES
Revenues	[1]	572,729	586,628	630,584
Gross profit	[1]	139,308	134,471	136,477
Total operating income (loss)	[1]	18,817	(3,528)	(9,464)
Operating income (loss)	[1]	18,817	(3,528)	(9,464)
Long-lived assets	[1],[6]	89,487	83,225	105,978
CANADA
Revenues	[1]	118,253	123,033	133,612
Gross profit	[1]	24,360	22,183	22,823
Total operating income (loss)	[1]	11,849	7,460	9,482
Operating income (loss)	[1]	11,849	7,460	9,482
Long-lived assets	[1],[6]	7,817	7,462	7,725
Europe [Member]
Revenues	[1]	37,251	64,278	66,794
Gross profit	[1]	11,437	14,849	8,379
Total operating income (loss)	[1]	6,230	(11,363)	(10,599)
Operating income (loss)	[1]	6,230	(11,363)	(10,599)
Long-lived assets	[1],[6]	3,073	3,336	8,295
Other Foreign Countries [Member]
Revenues	[1]	79,531	111,948	166,871
Gross profit	[1]	21,354	33,498	57,700
Total operating income (loss)	[1]	4,092	8,664	30,590
Operating income (loss)	[1]	4,092	8,664	30,590
Long-lived assets	[1],[6]	1,413	10,192	6,662
Infrastructure Solutions [Member]
Revenues		562,571	590,797	604,121
Infrastructure Solutions [Member] | UNITED STATES
Revenues		443,196	427,220	430,187
Infrastructure Solutions [Member] | CANADA
Revenues		69,190	65,370	62,292
Infrastructure Solutions [Member] | Europe [Member]
Revenues		23,782	49,157	54,567
Infrastructure Solutions [Member] | Other Foreign Countries [Member]
Revenues		26,403	49,050	57,075
Corrosion Protection [Member]
Revenues		245,193	295,090	393,740
Corrosion Protection [Member] | UNITED STATES
Revenues		129,533	159,408	200,397
Corrosion Protection [Member] | CANADA
Revenues		49,063	57,663	71,320
Corrosion Protection [Member] | Europe [Member]
Revenues		13,469	15,121	12,227
Corrosion Protection [Member] | Other Foreign Countries [Member]
Revenues		53,128	62,898	109,796
Operating Segments [Member] | Infrastructure Solutions [Member]
Revenues		562,571	590,797	604,121
Gross profit		144,213	144,074	132,411
Total operating income (loss)	[7]	78,098	42,079	37,509
Total assets		511,606	508,226	500,977
Capital expenditures	[4]	10,103	10,679	12,730
Depreciation and amortization	[5]	14,174	13,773	16,758
Operating income (loss)	[7]	78,098	42,079	37,509
Operating Segments [Member] | Corrosion Protection [Member]
Revenues		245,193	295,090	393,740
Gross profit		52,246	60,927	92,968
Total operating income (loss)	[8]	(6,133)	(5,635)	16,283
Total assets		238,566	278,694	279,106
Capital expenditures	[4]	5,654	11,437	9,754
Depreciation and amortization	[5]	12,007	12,487	11,874
Operating income (loss)	[8]	(6,133)	(5,635)	16,283
Corporate, Non-Segment [Member]
Total operating income (loss)	[9]	(30,977)	(35,211)	(33,783)
Total assets		58,425	39,794	50,098
Capital expenditures	[4]	802	3,219	4,977
Depreciation and amortization	[5]	2,521	2,413	2,112
Operating income (loss)	[9]	$ (30,977)	$ (35,211)	$ (33,783)
[1]	Attributed to the country of origin.
[2]	Interest expense for 2020 includes $0.7 million of third-party arranging fees, expenses and the write-off of unamortized loan costs associated with the amended Credit Facility (see Note 9). Interest expense for 2018 includes $2.3 million of third-party arranging fees, expenses and the write-off of unamortized loan costs associated with the amended Credit Facility (see Note 9).
[3]	Other expense for 2020 includes gains of $0.9 million related to restructuring (see Note 4). Other expense for 2019 includes $10.2 million of restructuring charges (see Note 4). Other expense for 2018 includes charges of $7.0 million related to the loss on the sale of Bayou (see Note 1) and $4.0 million of restructuring charges (see Note 4).
[4]	Capital expenditures from our discontinued operations were $3.0 million, $3.4 million and $3.1 million in 2020, 2019 and 2018, respectively.
[5]	Depreciation and amortization from our discontinued operations were $6.8 million, $7.5 million and $7.1 million in 2020, 2019 and 2018, respectively.
[6]	Long-lived assets do not include goodwill, intangible assets, operating lease assets or deferred tax assets.
[7]	Operating income for 2020 includes: (i) $0.1 million of restructuring reversals (see Note 4); (ii) $0.4 million of costs primarily related to the planned divestiture of certain international operations; and (iii) $1.1 million of impairment reversals related to assets held for sale. Operating income for 2019 includes: (i) $7.5 million of restructuring charges (see Note 4); (ii) $1.0 million of costs primarily related to the planned divestiture of certain international operations; and (iii) $17.6 million of impairment charges to assets held for sale (see Note 6). Operating income for 2018 includes: (i) $16.1 million of restructuring charges (see Note 4); and (ii) $0.4 million of cost incurred related to the disposition of Denmark.
[8]	Operating loss for 2020 includes $9.5 million of restructuring charges (see Note 4). Operating loss for 2019 includes: (i) $7.7 million of restructuring charges (see Note 4); (ii) $0.1 million of divestiture costs; and (iii) $2.9 million of impairment charges to assets held for sale (see Note 6). Operating income for 2018 includes: (i) $7.6 million of restructuring charges (see Note 4); and (ii) $2.5 million of costs incurred related to the divestiture of Bayou.
[9]	Operating loss for 2020 includes: (i) $2.7 million of restructuring charges (see Note 4); (ii) $3.2 million of divestiture costs; and (iii) $1.3 million of impairment charges related to assets held for sale (see Note 6). Operating loss for 2019 includes: (i) $5.2 million of restructuring charges (see Note 4); (ii) $2.2 million of costs primarily related to the planned divestiture of certain international operations; and (iii) $2.9 million of impairment charges to assets held for sale (see Note 6). Operating loss for 2018 includes $1.6 million of restructuring charges (see Note 4) and $4.1 million of divestiture costs.

Note 15 - Derivative Financia_3

Note 15 - Derivative Financial Instruments (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Mar. 12, 2018	Oct. 31, 2015
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net	$ 0	$ 200	$ 500
Derivative, Fixed Interest Rate				2.937%
A 2015 Interest Rate Swap [Member]
Derivative, Fixed Interest Rate					1.46%
Derivative Asset, Notional Amount					$ 262,500
A 2018 Interest Rate Swap [Member]
Derivative, Amount of Hedged Item				$ 170,600
Derivative, Fixed Interest Rate				2.937%
Derivative Asset, Notional Amount				$ 170,600
The 2015 Credit Facility [Member]
Derivative, Amount of Hedged Item					262,500
Line of Credit Facility, Maximum Borrowing Capacity					$ 350,000
A 2018 Credit Facility [Member]
Derivative Asset, Notional Amount				$ 170,600
Designated as Hedging Instrument [Member]
Derivative Assets (Liabilities), at Fair Value, Net, Total	(9,018)	(4,638)
Fair Value, Recurring [Member] | Designated as Hedging Instrument [Member]
Derivative Assets (Liabilities), at Fair Value, Net, Total	$ (9,000)	$ (4,600)

Note 15 - Derivative Financia_4

Note 15 - Derivative Financial Instruments - Summary of Derivative Positions (Details) - Interest Rate Swap [Member]	12 Months Ended
	Dec. 31, 2020USD ($)
Notional amount	$ 166,287,598
Weighted average remaining maturities (Year)	2 years 2 months 12 days

Note 15 - Derivative Financia_5

Note 15 - Derivative Financial Instruments - Summary of Fair Value Amounts of Derivative Instruments (Details) - Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Derivative assets	$ 0	$ 261
Derivative liabilities	9,018	4,899
Net Derivative Asset (Liability)	(9,018)	(4,638)
Interest Rate Swap [Member]
Derivative assets	0	261
Derivative liabilities	9,018	4,899
Other Noncurrent Assets [Member] | Interest Rate Swap [Member]
Derivative assets	0	261
Other Noncurrent Liabilities [Member] | Interest Rate Swap [Member]
Derivative liabilities	$ 9,018	$ 4,899

Note 16 - Subsequent Event (Det

Note 16 - Subsequent Event (Details Textual) - USD ($)	2 Months Ended	3 Months Ended	12 Months Ended
	Feb. 15, 2021	Jun. 30, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
The Open Market Repurchase Program [Member]
Stock Repurchased During Period, Shares (in shares)			381,677	1,492,348	949,464
Stock Repurchased During Period, Value			$ 6,600,000	$ 26,300,000	$ 20,300,000
Stock Repurchase Program, Average Cost Per Share (in dollars per share)			$ 17.16	$ 17.64	$ 21.36
The Open Market Repurchase Program [Member] | Subsequent Event [Member]
Stock Repurchased During Period, Shares (in shares)	39,501
Stock Repurchased During Period, Value	$ 800,000
Stock Repurchase Program, Average Cost Per Share (in dollars per share)	$ 19.84
Forecast [Member] | New Mountain Capital, L.L.C. [Member]
Business Combination, Consideration Transferred, Total		$ 963,000,000
Business Acquisition, Share Price (in dollars per share)		$ 26
Business Combination, Termination Fee		$ 30,000,000