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Note 3 - Business Combination - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jul. 27, 2018
Sep. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Liabilities          
Bargain purchase gain   $ (21,900) $ (20,080)
Ameron Water Transmission Group, LLC [Member]          
Assets          
Cash and cash equivalents $ 912        
Trade and other receivables 8,887        
Contract assets 12,018        
Inventories 7,937        
Prepaid expenses and other 3,777        
Property and equipment 34,827        
Other assets 320        
Total assets acquired 68,678        
Liabilities          
Accounts payable 5,520        
Accrued liabilities 1,599        
Contract liabilities 123        
Deferred income taxes 3,221        
Total liabilities assumed 10,463        
Bargain purchase gain (20,080)        
Total purchase consideration $ 38,135