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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Balance |  | $ 2,700 |
Affiliate credit loss impairment expense | $ 400 | 52,981 | $ 0
Write offs |  |  | (2,600)
Balance |  |  | 2,700
Trade Accounts Receivable [Member] |  |  |
Balance | 1,516 | 70 |
Affiliate credit loss impairment expense | 838 | 1,283 |
Other | 0 | 0 |
Write offs | (406) |  |
Other | 0 | 0 |
Balance | 1,948 | 1,516 | 70
Trade Accounts Receivable [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |
Balance |  | 163 |
Balance |  |  | 163
Due from Affiliate [Member] |  |  |
Balance | 71,800 | 20,083 |
Affiliate credit loss impairment expense | 400 | 52,981 |
Other | 256 | (1,264) |
Write offs | 0 |  |
Other | 256 | (1,264) |
Balance | $ 72,456 | 71,800 | 20,083
Due from Affiliate [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |
Balance |  | $ 0 |
Balance |  |  | $ 0

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- Definition Amount of increase (decrease) in allowance for credit loss on accounts receivable, classified as other. + References No definition available. + Details
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