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Note 4 - Inventories, Net - Summary of Inventories (Details) (Parentheticals) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Pipe and Connectors [Member]    
Allowance $ 14,630 $ 16,819
Finished Goods [Member]    
Allowance 84 84
Raw Materials [Member]    
Allowance $ 181 $ 0