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Note 2 - Acquisitions - Components of Fair Value of Acquisitions and Allocation of Purchase Price For Acquisition of GS Engineering (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2019
Payments to Acquire Businesses, Net of Cash Acquired, Total     $ (0) $ 95,918  
Goodwill, Ending Balance $ 281,503 $ 281,503 282,207    
GS Engineering [Member]          
Cash payments 30,502 30,500 30,502    
Less, cash acquired (622)   (622)    
Payments to Acquire Businesses, Net of Cash Acquired, Total 29,880   29,880    
Other acquired assets 2,197 2,197 2,125    
Other acquired assets     (72)    
Inventories 228 228 153    
Inventories, Adjustments     (75)    
Customer Backlog 180 180 180    
Property, plant, & equipment 1,391 1,391 1,391    
Identifiable intangible assets 8,910 8,910 8,910   $ 8,900
Goodwill, Ending Balance 17,976 17,976 18,123   $ 18,100
Goodwill, Adjustments     147    
Liabilities assumed $ (1,002) $ (1,002) $ (1,002)