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Note 3 - Revenue Recognition - Changes in Unearned Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Unearned revenue, beginning of period $ 0 $ 1,803
Additional unearned revenue 0 0
Revenue recognized 0 114
Unearned revenue, end of period $ 0 $ 1,689