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Note 8 - Stock-Based Compensation (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Share-Based Payment Arrangement, Expense $ 530,000 $ 997,000 $ 1,501,000 $ 3,175,000
Stock Issued During Period, Shares, Stock Swaps (in shares) 0   0 38
Stock Issued During Period, Shares, Stock Swaps Equity Instruments Received (in shares)       531