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Note 9 - Share-based Compensation
3 Months Ended
Mar. 31, 2019
Notes to Financial Statements  
Share-based Payment Arrangement [Text Block]
9.
Share-based Compensation
 
Our Third Amended and Restated
2006
Stock Option and Incentive Plan allows for granting of incentive stock options, non-qualified stock options, stock appreciation rights, restricted stock units, unrestricted stock awards and deferred stock awards to our officers, employees, directors and consultants. The components of share-based compensation expense were as follows:
 
   
Three months ended
 
   
March 31,
 
   
2019
   
2018
 
   
(in thousands)
 
Stock option awards
  $
447
    $
389
 
Restricted stock units
   
299
     
232
 
                 
Total share-based compensation
  $
746
    $
621
 
 
Stock-based compensation is included in our statements of operations as follows:
 
   
Three months ended
 
   
March 31,
 
   
2019
   
2018
 
   
(in thousands)
 
Cost of sales
  $
82
    $
64
 
Sales and marketing
   
158
     
138
 
General and administrative
   
419
     
351
 
Research and development
   
87
     
68
 
                 
Total stock-based compensation
  $
746
    $
621
 
 
 
We did
not
grant any options or issue any awards of restricted stock during the
three
-month periods ended
March 31, 2019
or
2018.
 
We issued approximately
63,000
and
35,000
shares of common stock following the exercise or vesting of underlying stock options or restricted stock units during the
three
months ended
March 31, 2019
and
2018,
respectively.