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Note 9 - Stock Based Compensation - Restricted Stock Activity (Details) - $ / shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Non-vested, shares (in shares) | 36,828 | 30,205
Non-vested, weighted average grant date fair value (in dollars per share) | $ 40.11 | $ 35.63
Granted, shares (in shares) | 17,716 | 13,243
Granted, weighted average grant date fair value (in dollars per share) | $ 40.50 | $ 44.30
Vested, shares (in shares) | (9,993) | (6,400)
Vested, weighted average grant date fair value (in dollars per share) | $ 36.71 | $ 27.50
Forfeited, shares (in shares) | 0 | (220)
Forfeited, weighted average grant date fair value (in dollars per share) | $ 0 | $ 43.65
Non-vested, shares (in shares) | 44,551 | 36,828
Non-vested, weighted average grant date fair value (in dollars per share) | $ 41.03 | $ 40.11

X
- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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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. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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