Note 10 - Stock Based Compensation - Restricted Stock Activity (Details) - $ / shares |
9 Months Ended | 12 Months Ended |
|---|---|---|
Sep. 30, 2020 |
Dec. 31, 2019 |
|
| Non-vested, shares (in shares) | 30,205 | 27,423 |
| Non-vested, weighted average grant date fair value (in dollars per share) | $ 35.63 | $ 32.58 |
| Granted, shares (in shares) | 13,243 | 7,407 |
| Granted, weighted average grant date fair value (in dollars per share) | $ 44.30 | $ 43.00 |
| Vested, shares (in shares) | (6,400) | (4,625) |
| Vested, weighted average grant date fair value (in dollars per share) | $ 27.50 | $ 29.37 |
| Forfeited, shares (in shares) | 0 | 0 |
| Forfeited, weighted average grant date fair value (in dollars per share) | $ 0 | $ 0 |
| Non-vested, shares (in shares) | 37,048 | 30,205 |
| Non-vested, weighted average grant date fair value (in dollars per share) | $ 40.13 | $ 35.63 |
| X | ||||||||||
- Definition Gross number of share options (or share units) granted during the period. No definition available.
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| X | ||||||||||
- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Number of non-vested options outstanding. No definition available.
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| X | ||||||||||
- Definition Number of non-vested options forfeited. No definition available.
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| X | ||||||||||
- Definition Weighted average grant-date fair value of non-vested options forfeited. No definition available.
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| X | ||||||||||
- Definition Weighted average grant-date fair value of non-vested options outstanding. No definition available.
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| X | ||||||||||
- Definition Number of options vested. No definition available.
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| X | ||||||||||
- Definition Weighted average grant-date fair value of options vested. No definition available.
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