Note 11 - Debt, Net - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Debt instrument, carrying value	$ 169,087	$ 438,484
Net unamortized debt issuance costs	(806)	(4,939)
Total debt, net	168,281	433,545
Less: current portion of long-term debt	(39,076)	(39,102)
Total long-term debt, net	129,205	394,443
Senior Notes [Member] \| Five Point Five Five Percent Senior Note Due June Two Zero Two Three [Member]
Debt instrument, carrying value	2,366	4,730
Senior Notes [Member] \| Four Point Seven Three Percent Senior Note Due December Two Zero Two Three [Member]
Debt instrument, carrying value	6,004	12,008
Senior Notes [Member] \| Five Point Eight Two Percent Senior Note Due March Two Zero Two Four [Member]
Debt instrument, carrying value	25,368	38,053
Senior Notes [Member] \| Eight Point Nine Two Percent Senior Note Due March Two Zero Two Four [Member]
Debt instrument, carrying value	8,023	12,035
Senior Notes [Member] \| Five Point Zero Three Percent Senior Note Due December Two Zero Two Six [Member]
Debt instrument, carrying value	45,683	57,104
Senior Notes [Member] \| Five Point One Eight Percent Senior Note Due December Two Zero Two Six [Member]
Debt instrument, carrying value	11,643	14,554
NRP LP [Member] \| Nine Point One Two Five Percent Senior Notes Due June Two Zero Two Five [Member]
Debt instrument, carrying value	0	300,000
Opco [Member] \| Floating Rate Revolving Credit Facility Due April 2023 [Member]
Debt instrument, carrying value	70,000	0
Opco [Member] \| Senior Notes [Member]
Debt instrument, carrying value	$ 99,087	$ 138,484

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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