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Note 8 - Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2016
Note 8 - Stock-Based Compensation  
Summary of options issued, exercised and cancelled

A summary of options issued, exercised and cancelled are as follows:

 

    Shares   Weighted- Average Exercise Price ($)   Weighted- Average Remaining Contractual Term   Aggregate Intrinsic Value ($)
Outstanding at December 31, 2015       67,879     $ 21.40       7.17        
Granted                          
Cancelled                          
                                   
Outstanding at March 31, 2016       67,879     $ 21.40       6.92        
                                   
Exercisable at March 31, 2016       66,635     $ 34.75       6.82