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Note 7 - Stock-based Compensation
 6 Months Ended
Jun. 30, 2019
Notes to Financial Statements  
Shareholders' Equity and Share-based Payments [Text Block]
7.
   
STOCK-BASED COMPENSATION
 
We recorded non-cash stock compensation expense in each period as follows:
 
   
Three-month period ended
    
Six-month period ended
  
   
June 30,
    
July 1,
    
June 30,
    
July 1,
  
   
2019
    
2018
    
2019
    
2018
  
Stock options
   $
142
     $
186
     $
316
     $
309
  
Restricted stock grants
    
33
      
19
      
44
      
35
  
Total
   $
175
     $
205
     $
360
     $
344
  
 
We have stock options outstanding from various stock-based employee compensation plans for which we record compensation cost relating to share-based payment transactions in our financial statements. As of
June 30, 2019,
there was
$284
of total unrecognized compensation cost related to outstanding stock options, which is expected to be recognized over a weighted average period of
1.1
years.
 
The following table summarizes stock option activity for the
six
-month period ended
June 30, 2019:
 
   
Number of
Shares
    
Weighted
Average
Exercise
Price
    
Weighted
Average
Remaining
Contractual
Term (years)
    
Aggregate
Intrinsic
Value
  
Outstanding at January 1, 2019
    
1,576,087
     $
6.58
      
 
      
 
  
Granted
    
-
      
-
      
 
      
 
  
Exercised
    
(104,587
 )    
4.56
      
 
      
 
  
Forfeited or expired
    
(6,916
 )    
4.59
      
 
      
 
  
Outstanding at June 30, 2019
    
1,464,584
     $
6.74
      
3.03
     $
2,917
  
Vested and expected to vest at June 30, 2019
    
1,409,866
     $
6.69
      
2.94
     $
2,860
  
Exercisable at June 30, 2019
    
1,189,793
     $
6.13
      
2.65
     $
2,704
  
 
Cash received from stock option exercises under our stock-based compensation plans for the
three
-month periods ended
June 30, 2019
and
July 1, 2018
was
$122
and
$354,
respectively. Cash received from stock option exercises under our stock-based compensation plans for the
six
-month periods ended
June 30, 2019
and
July 1, 2018
was
$478
and
$1,293,
respectively.
 
In
April 2019,
20,000
shares of restricted stock were awarded to certain of our employees at a weighted-average grant date fair value of
$11.12
per share. In
January 2018,
17,500
shares of restricted stock were awarded to certain of our employees at a weighted-average grant date fair value of
$7.16
per share. All outstanding restricted shares vest in equal annual installments over
three
years. Unrecognized compensation cost related to these restricted shares was
$230
at
June 30, 2019.