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Note 2 - Business Combination - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jul. 27, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Liabilities          
Bargain purchase gain   $ (21,880) $ (21,880)
Ameron Water Transmission Group, LLC [Member]          
Assets          
Cash and cash equivalents $ 912        
Trade and other receivables 12,806        
Contract assets 11,858        
Inventories 9,895        
Prepaid expenses and other 452        
Property and equipment 34,709        
Other assets 218        
Total assets acquired 70,850        
Liabilities          
Accounts payable 5,520        
Accrued liabilities 1,894        
Contract liabilities 123        
Deferred income taxes 3,298        
Total liabilities assumed 10,835        
Bargain purchase gain (21,880)        
Total purchase consideration $ 38,135