Note 4 - Fair Value Measurements - Financial Instruments Fair Value (Details) - USD ($) $ in Thousands		Mar. 31, 2023	Dec. 31, 2022
Carrying value, current		$ 645,469	$ 704,349
Reported Value Measurement [Member] | Senior Unsecured Notes Due 2024 [Member]
Carrying value, current	[1]	225,000	225,000
Reported Value Measurement [Member] | The 10.625% Senior Notes [Member]
Carrying value	[1]	250,000	250,000
Estimate of Fair Value Measurement [Member] | Senior Unsecured Notes Due 2024 [Member]
Carrying value, current	[1]	225,000	225,000
Estimate of Fair Value Measurement [Member] | The 10.625% Senior Notes [Member]
Carrying value	[1]	$ 250,000	$ 250,000

[1] Fair value is determined using Level 2 inputs. The Company’s senior unsecured notes are quoted, but not actively traded, on major exchanges; therefore, fair value is based on periodic values as quoted on major exchanges. See Note 7 for additional information.