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Note 3 - Revenue Recognition - Changes in Unearned Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Unearned revenue, beginning of period $ 1,570 $ 11,720 $ 1,803 $ 3,000
Additional unearned revenue 0 2,724 0 12,608
Revenue recognized 131 1,947 364 3,111
Unearned revenue, end of period $ 1,439 $ 12,497 $ 1,439 $ 12,497