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Note 10 - Stock Based Compensation - Restricted Stock Activity (Details) - $ / shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 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
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) |  |
Forfeited, weighted average grant date fair value (in dollars per share) |  |
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
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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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