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Note 10 - Stock Based Compensation - Restricted Stock Activity (Details) - $ / shares | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Non-vested, shares (in shares) | 27,423 | 30,690
Non-vested, weighted average grant date fair value (in dollars per share) | $ 32.58 | $ 28.51
Granted, shares (in shares) | 7,407 | 4,433
Granted, weighted average grant date fair value (in dollars per share) | $ 43 | $ 43.50
Vested, shares (in shares) | (4,625) | (7,700)
Vested, weighted average grant date fair value (in dollars per share) | $ 29.37 | $ 22.64
Forfeited, shares (in shares) |  |
Forfeited, weighted average grant date fair value (in dollars per share) |  |
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

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=116856206&loc=d3e5070-113901 + Details
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