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