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Note 7 - Share-based Compensation - Stock-settled Stock Appreciation Rights Transactions (Details) - Stock Appreciation Rights (SARs) [Member] - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020 | Jan. 01, 2021
Outstanding SARS (in shares) |  | 317,128 |  |
Outstanding (in dollars per share) |  | $ 13.47 |  |
Outstanding SARS, weighted average remaining life (Year) |  | 2 years 10 months 17 days | 3 years 4 months 9 days |
Outstanding SARS, aggregate intrinsic value |  | $ 2,899 |  | $ 2,031
Granted SARs (in shares) | [1] | 31,687 |  |
Granted SARS, weighted average exercise price (in dollars per share) | [1] | $ 25.75 |  |
Exercised SARs (in shares) |  | (26,438) |  |
Exercised SARS, weighted average exercise price (in dollars per share) |  | $ 14.74 |  |
Outstanding SARS (in shares) |  | 322,377 | 317,128 |
Outstanding SARS, weighted average exercise price (in dollars per share) |  | $ 14.57 | $ 13.47 |
Exercisable (in shares) |  | 160,586 |  |
Exercisable, weighted average exercise price (in dollars per share) |  | $ 15.29 |  |
Exercisable, weighted average remaining life (Year) |  | 2 years 2 months 12 days |  |
Exercisable, aggregate intrinsic value |  | $ 1,296 |  |
[1] | The weighted average grant date fair value of SARs granted was $10.09 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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- Definition Weighted average remaining contractual term for non-option equity awards outstanding, 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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- Definition Number of non-option equity instruments exercised by participants. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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