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Note 7 - Stock Plans - Summary of Weighted Average Fair Value and Vesting of Restricted Stock Grants (Details) - Restricted Stock [Member] - $ / shares | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022
Granted, awards (in shares) | 36,734 |  | 34,570 |
Shares granted, weighted average grant date fair value (in dollars per share) | $ 49.28 |  | $ 49.83 |
The 2012 Director Stock Incentive Plan [Member] |  |  |  |
Granted, awards (in shares) | 0 | [1] | 18,000 |
Shares granted, weighted average grant date fair value (in dollars per share) | $ 0 |  | $ 49.85 |
The 2012 Omnibus Stock Incentive Plan [Member] | Award Date One [Member] |  |  |  |
Granted, awards (in shares) | 18,000 | [2] | 16,520 | [1]
Shares granted, weighted average grant date fair value (in dollars per share) | $ 49.43 |  | $ 49.85 |
The 2012 Omnibus Stock Incentive Plan [Member] | Award Date Two [Member] |  |  |  |
Granted, awards (in shares) | 17,684 |  | 50 | [2]
Shares granted, weighted average grant date fair value (in dollars per share) | $ 49.43 |  | $ 35.91 |
The 2012 Omnibus Stock Incentive Plan [Member] | Award Date Three [Member] |  |  |  |
Granted, awards (in shares) | 50 |  | 0 | [3]
Shares granted, weighted average grant date fair value (in dollars per share) | $ 49.43 |  | $ 0 |
The 2012 Omnibus Stock Incentive Plan [Member] | Award Date Four [Member] |  |  |  |
Granted, awards (in shares) | 1,000 |  | 0 |
Shares granted, weighted average grant date fair value (in dollars per share) | $ 44.06 |  | $ 0 |
[1] | Vest after 3 years – 33% each year
[2] | Vest fully after 3 years
[3] | Vest after 1 year

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Net number of non-option equity instruments granted to participants. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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