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Note 6 - Net Income Per Common Unit - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Net income attributable to common unitholders | $ 151,813 |  | $ 196,771 |  | $ 233,722 |
Weighted average common units—basic (in shares) | 12,991 |  | 12,619 |  | 12,484 |
Basic net income per common unit (in dollars per share) | $ 11.69 |  | $ 15.59 |  | $ 18.72 |
Plus: dilutive effect of preferred units (in shares) | 281 |  | 2,059 |  | 6,176 |
Plus: dilutive effect of warrants (in shares) | 139 |  | 1,202 |  | 783 |
Plus: dilutive effect of unvested unit-based awards (in shares) | 236 |  | 216 |  | 210 |
Weighted average common units—diluted (in shares) | 13,647 |  | 16,096 |  | 19,653 |
Net income | $ 183,644 | [1] | $ 278,435 | [2] | $ 268,492 | [3]
Less: income attributable to preferred unitholders | (1,148) |  | (2,694) |  | 0 |
Less: redemption of preferred units | (24,485) |  | (60,929) |  | 0 |
Diluted net income attributable to common unitholders and the general partner | 158,011 |  | 214,812 |  | 268,492 |
Less: diluted net income attributable to the general partner | (3,160) |  | (4,296) |  | (5,370) |
Diluted net income attributable to common unitholders | $ 154,851 |  | $ 210,516 |  | $ 263,122 |
Diluted net income per common unit (in dollars per share) | $ 11.35 |  | $ 13.08 |  | $ 13.39 |
[1] | Net income includes $4.2 million of income attributable to preferred unitholders that accumulated during the period, of which $4.2 million is allocated to the common unitholders and $0.1 million is allocated to the general partner.
[2] | Net income includes $16.7 million of income attributable to preferred unitholders that accumulated during the period, of which $16.4 million is allocated to the common unitholders and $0.3 million is allocated to the general partner.
[3] | Net income includes $30.0 million of income attributable to preferred unitholders that accumulated during the period, of which $29.4 million is allocated to the common unitholders and $0.6 million is allocated to the general partner.

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