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Note 6 - Fair Value of Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2026
Notes Tables |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  | June 30, 2026 |  |  | December 31, 2025 |
Carrying amount (excluding unamortized debt issuance costs) |  | $ | 1,287,225 |  |  | $ | 1,286,233 |
Estimated fair value |  | $ | 1,265,119 |  |  | $ | 1,267,698 |

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