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Note 6 - Share-based Compensation - Stock-settled Stock Appreciation Rights Transactions (Details) - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Sep. 30, 2024 | Dec. 31, 2023
Lapsed or cancelled (in shares) |  |  | (199,984) |
Lapsed or cancelled, weighted average exercise price (in dollars per share) |  |  | $ 16.49 |
Stock Appreciation Rights (SARs) [Member] |  |  |  |
Outstanding SARS (in shares) |  | 292,508 | 292,508 |
Outstanding (in dollars per share) |  | $ 14.35 | $ 14.35 |
Outstanding SARS, weighted average remaining life (Year) |  |  | 2 years 4 months 2 days | 2 years 25 days
Outstanding SARS, aggregate intrinsic value |  |  | $ 832 | $ 506
Granted SARs (in shares) | [1] | 79,128 |  |
Granted SARS, weighted average exercise price (in dollars per share) | [1] | $ 13.84 |  |
Exercised SARs (in shares) |  | (17,920) |  |
Exercised SARS, weighted average exercise price (in dollars per share) |  | $ 8.48 |  |
Lapsed or cancelled (in shares) |  | (81,770) |  |
Lapsed or cancelled, weighted average exercise price (in dollars per share) |  | $ 19.23 |  |
Outstanding SARS (in shares) |  | 271,946 |  | 292,508
Outstanding SARS, weighted average exercise price (in dollars per share) |  | $ 13.12 |  | $ 14.35
Exercisable (in shares) |  | 137,742 |  |
Exercisable, weighted average exercise price (in dollars per share) |  | $ 13.37 |  |
Exercisable SARS, weighted average remaining life (Year) |  |  | 9 months 14 days |
Exercisable, aggregate intrinsic value |  |  | $ 479 |
[1] | The weighted average grant date fair value of SARs granted was $3.80 per share.

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- Definition The weighted average grant-date fair value of SARS exercised during the reporting period as calculated by applying the disclosed option pricing methodology. + References No definition available. + Details
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- Definition The weighted average exercise price of non-option equity instruments granted during the period. + References No definition available. + Details
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- Definition Weighted average remaining contractual term for vested portions of non-options equity instruments outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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