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Note 7 - Fair Value of Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2023
Notes Tables |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  | March 31, 2023 |  |  | December 31, 2022 |
|  | (unaudited) |  |  |  |  |
Carrying amount (excluding unamortized debt issuance costs) |  | $ | 1,187,267 |  |  | $ | 1,171,238 |
Estimated fair value |  | $ | 1,136,730 |  |  | $ | 1,092,345 |

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