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Note 14 - Stock-based Compensation - Summary of Nonvested Restricted Stock (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Nonvested, stock options (in shares) | 0 |  |
Granted, stock options (in shares) | 0 | 0 | 0
Nonvested, stock options (in shares) |  | 0 |
Restricted Stock [Member] |  |  |
Nonvested, stock options (in shares) | 104,150 |  |
Nonvested - weighted average grant date fair value, stock options (in dollars per share) | $ 17.14 |  |
Granted, stock options (in shares) | 34,932 |  |
Granted (in dollars per share) | $ 36.35 |  |
Canceled/forfeited/expired, stock options (in shares) | (150) |  |
Canceled/forfeited/expired - weighted average grant date fair value, stock options (in dollars per share) | $ 42.65 |  |
Vested, stock options (in shares) | (38,015) |  |
Vested - weighted average grant date fair value, stock options (in dollars per share) | $ 18.91 |  |
Nonvested, stock options (in shares) | 100,917 | 104,150 |
Nonvested - weighted average grant date fair value, stock options (in dollars per share) | $ 23.09 | $ 17.14 |

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- 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=109197908&loc=d3e5070-113901 + Details
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- Definition Number of non-vested options outstanding. + References No definition available. + Details
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