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Note 5 - Stock Option Plan (Tables) | 6 Months Ended
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Jun. 30, 2017
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, 2017 |  |  | 14,000 |  |  | $ | 24.50 |
Granted |  |  | - |  |  |  | - |
Vested |  |  | - |  |  |  | - |
Forfeited |  |  | - |  |  |  | - |
Nonvested at June 30, 2017 |  |  | 14,000 |  |  | $ | 24.50 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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