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Note 6 - Stock Option Plan (Tables) | 9 Months Ended
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Sep. 30, 2016
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, 2016 |  |  | 18,000 |  |  | $ | 24.50 |
Granted |  |  | - |  |  |  | - |
Vested |  |  | 4,000 |  |  | $ | 24.50 |
Forfeited |  |  | - |  |  |  | - |
Nonvested at September 30, 2016 |  |  | 14,000 |  |  | $ | 24.50 |

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