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Note 3 - Revenue Recognition - Changes in Unearned Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Unearned revenue, beginning of period $ 0 $ 1,570 $ 0 $ 1,803
Additional unearned revenue 0 0 0 0
Revenue recognized 0 131 0 364
Unearned revenue, end of period $ 0 $ 1,439 $ 0 $ 1,439