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Note 1 - Nature of Operations and Summary of Significant Accounting Policies - Activity in the Allowance for Credit Losses (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Affiliate credit loss impairment expense | $ 0 | $ 400 | $ 52,981
Trade Accounts Receivable [Member] |  |  |
Balance | 1,948 | 1,516 | 70
Affiliate credit loss impairment expense | 414 | 838 | 1,283
Other | 0 | 0 | 0
Write offs |  | (406) |
Other | 0 | 0 | 0
Acquisition of Sonatide joint venture | 0 |  |
Balance | 2,362 | 1,948 | 1,516
Trade Accounts Receivable [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |
Balance |  |  | 163
Due from Affiliate [Member] |  |  |
Balance | 72,456 | 71,800 | 20,083
Affiliate credit loss impairment expense | 0 | 400 | 52,981
Other | (1,080) | 256 | (1,264)
Write offs |  | 0 |
Other | (1,080) | 256 | (1,264)
Acquisition of Sonatide joint venture | (59,678) |  |
Balance | $ 11,698 | $ 72,456 | 71,800
Due from Affiliate [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |
Balance |  |  | $ 0

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