Note 2 - Accounting Policies - Investments in Variable Interest Entities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Current assets	$ 450,215		$ 481,867
Current liabilities	234,041		219,650
Variable Entity [Member]
Current assets	18,304		33,066
Non-current assets	7,635		6,466
Current liabilities	8,261		12,953
Non-current liabilities	1,962		8,780
Revenue	28,403	[1]	49,809	[2]	$ 91,947
Gross profit	9,508	[1]	9,898	[2]	15,194
Net (income) loss attributable to Aegion Corporation	$ (1,100)	[1]	$ (1,374)	[2]	$ 3,432

[1] Includes activity from our Tite Liner joint venture in Mexico, which was sold during the fourth quarter of 2019.

[2] Includes activity from our pipe coating and insulation joint venture in Louisiana, which was sold during the third quarter of 2018.