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Note 2 - Business Combination (Details Textual)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Sep. 30, 2021
Sep. 30, 2020
USD ($)
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 $ 49,419        
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Trade and Other Receivables     $ (100)    
Business Combination, Acquisition Related Costs   $ 0     $ 2,600