Quarterly report pursuant to Section 13 or 15(d)

Note 3 - Fair Value Measurements - Carrying Value and Fair Value of Long-term Debt (Details)

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Note 3 - Fair Value Measurements - Carrying Value and Fair Value of Long-term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Long-term debt, carrying value $ 593,838 $ 625,286
Long-term debt, fair value 538,087 473,352
Credit Agreement [Member]    
Long-term debt, carrying value 48,000 80,000
Long-term debt, fair value 48,000 80,000
Senior Second Lien Notes Due November 2023 [Member]    
Long-term debt, carrying value 545,838 545,286
Long-term debt, fair value $ 490,087 $ 393,352