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Note 3 - Allowance for Credit Losses (Tables) | 3 Months Ended
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Mar. 31, 2021
Notes Tables |
Financing Receivable, Allowance for Credit Loss [Table Text Block] |
|  | Trade |  |  | Due |
|  | and Other |  |  | from |
(In thousands) |  | Receivables |  |  | Affiliate |
Balance at January 1, 2021 |  | $ | 1,516 |  |  | $ | 71,800 |
Current period provision for expected credit losses |  |  | 709 |  |  |  | — |
Write offs |  |  | (89 | ) |  |  | — |
Other |  |  | — |  |  |  | (205 | )
Balance at March 31, 2021 |  | $ | 2,136 |  |  | $ | 71,595 |

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