Note 5 - Stock-based Compensation (Details Textual) shares in Thousands	3 Months Ended
Mar. 31, 2025 USD ($) shares	Mar. 31, 2024 USD ($) shares
Number of Stock-based Compensation Plans in Effect	2
Share-Based Payment Arrangement, Expense	$ 473,000	$ 160,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) \| shares	0	0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period (in shares) \| shares	0	0
Restricted Stock Units (RSUs) [Member]
Share-Based Payment Arrangement, Expense	$ 473,000	$ 160,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 4,000,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	2 years 1 month 6 days

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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Number of share options (or share units) exercised during the current period.

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