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Note 6 - Stock-based Compensation Plan (Tables) | 3 Months Ended
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Mar. 31, 2019
Notes Tables |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Number of Shares |  | Weighted Average Grant Date Fair Value
Nonvested at January 1, 2019 |  |  | 24,900 |  |  | $ | 34.10 |
Granted |  |  | 9,750 |  |  |  | 52.09 |
Vested |  |  | - |  |  |  | - |
Forfeited |  |  | - |  |  |  | - |
Nonvested at March 31, 2019 |  |  | 34,650 |  |  | $ | 39.16 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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