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Note 9 - Senior Notes and Unsecured Revolving Credit Facility - Indebtedness (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Senior Notes $ 244,865 $ 304,832
Total Indebtedness 244,865 304,832
Revolving Credit Facility [Member]    
Long-term Line of Credit, Total 0 0
7.25% Senior Notes Due 2025 [Member] | Senior Notes [Member]    
Senior Notes [1] 244,865 0
Senior Notes Due 2022 [Member] | Senior Notes [Member]    
Senior Notes [2] $ 0 $ 304,832
[1] The carrying value for the 2025 Notes, as presented at December 31, 2020, is net of the unamortized unamortized debt issuance costs of $5.1 million. The unamortized debt issuance costs are not factored into the estimated fair value.
[2] The carrying value of the 2022 Notes, as presented at December 31, 2019, is net of the unamortized discount of $1.1 million, unamortized premium of $0.9 million, and unamortized debt issuance costs of $3.0 million. The unamortized discount, unamortized premium and debt issuance costs are not factored into the estimated fair value.