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Note 6 - Stock Option Plan (Tables) | 9 Months Ended
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Sep. 30, 2018
Notes Tables |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  |  |  | Weighted
|  | Number |  | Average
|  | of |  | Grant Date
|  | Shares |  | Fair Value
Nonvested at January 1, 2018 |  |  | 10,500 |  |  | $ | 24.50 |
Granted |  |  | 20,000 |  |  | $ | 37.42 |
Vested |  |  | 4,200 |  |  | $ | 26.04 |
Forfeited |  |  | - |  |  |  | - |
Nonvested at September 30, 2018 |  |  | 26,300 |  |  | $ | 34.08 |

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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=109197908&loc=d3e5070-113901 + Details
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