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Note 2 - Business Combination (Details Textual)
$ in Thousands
3 Months Ended 5 Months Ended 6 Months Ended
Jan. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Number of Operating Segments 1     1
Geneva Pipe Company, Inc [Member]        
Business Acquisition, Percentage of Voting Interests Acquired 100.00%      
Business Combination, Consideration Transferred, Total $ 49,400   $ 49,419  
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Trade and Other Receivables   $ (100)    
Business Combination, Acquisition Related Costs   100   $ 2,600
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual     $ 20,400  
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory   $ 100