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Note 12 - Long-term Debt - Long-term Debt and Convertible Debentures (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Senior Notes $ 150,000  
Capital leases maturing at various dates through 2026 10,898  
Other long-term debt maturing at various dates up to 2023 2,956  
Long-term Debt and Lease Obligation, Including Current Maturities, Total 589,604  
Less: current portion 56,478 $ 5,545
Long-term debt - non-current 533,126 $ 761,078
Revolving Credit Facility [Member]    
Credit Agreement $ 425,750