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Note 5 - Impairment charge - Impairment allocated by CGU (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]        
Impairment charge $ 622,000 $ 622,402
OCTG (USA) [member]        
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]        
Assets before impairment   544,000    
Impairment charge 225,000 225,000    
Assets after impairment   319,000    
IPSCO [Member]        
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]        
Assets before impairment   1,169,000    
Impairment charge 357,000 357,000    
Assets after impairment   812,000    
Coiled Tubing [member]        
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]        
Assets before impairment   108,000    
Impairment charge 4,000 4,000    
Assets after impairment   104,000    
Rods USA [Member]        
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]        
Assets before impairment   73,000    
Impairment charge $ 36,000 36,000    
Assets after impairment   $ 37,000