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Note 2 - Business Combination (Details Textual)
$ in Thousands
3 Months Ended 8 Months Ended 9 Months Ended
Jan. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
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 $ 49,419            
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Trade and Other Receivables     $ (100)        
Business Combination, Acquisition Related Costs   $ 0   $ 500   $ 2,600 $ 500
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual   $ 12,500     $ 32,900