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Note 3 - Stock-based Compensation
 9 Months Ended
Sep. 30, 2018
Notes to Financial Statements  
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
3.
Stock-Based Compensation
 
The Company’s
2006
Incentive Plan (“the Plan”) provides for cash-based awards or the grant or issuance of stock-based awards. As of
September 30, 2018,
77
thousand shares remained available for future grant under the Plan.
 
A summary of the Company’s stock option activity for the
nine
months ended
September 30, 2018
is as follows (in thousands except per share amounts):
 
          Weighted Average  
     
Weighted Average
  
Remaining
  
Aggregate
   
Number of
  
Exercise Price
  
Contractual Life
  
Intrinsic
   
Shares
  
Per Share
  
(in years)
  
Value
(1)
Outstanding, December 31, 2017    
279
 
   $
15.40
 
    
8.7
 
   $
1,436
 
Granted    
119
 
   $
21.01
 
    
 
 
    
 
 
Exercised    
-
 
    
 
 
    
 
 
    
 
 
Forfeited    
-
 
    
 
 
    
 
 
    
 
 
Outstanding, September 30, 2018    
398
 
   $
17.09
 
    
8.4
 
   $
956
 
                                 
Exercisable, September 30, 2018    
143
 
   $
14.51
 
    
7.8
 
   $
616
 
 
(
1
)
 The aggregate intrinsic value on this table was calculated based on the amount, if any, by which the closing market value of the Company’s stock on
September 30, 2018 (
$18.81
) exceeded the exercise price of the underlying options, multiplied by the number of shares subject to each option.
 
A summary of the Company’s stock unit award activity for the
nine
months ended
September 30, 2018
is as follows (in thousands except per share amounts):
 
    Number
of Shares		   Weighted
Average Price
per Share
(2)
   Weighted
Average Fair
Value
(2)
             
Outstanding & Unvested, December 31, 2017    
33
     $
16.08
     $
516
  
Granted    
6
     $
21.04
     $
126
  
Converted to common stock    
(15
 )    
 
      
 
  
Cancelled    
(5
 )    
 
      
 
  
Forfeited    
-
      
 
      
 
  
Outstanding & Unvested, September 30, 2018    
19
     $
18.20
     $
343
  
 
(
2
)		 Weighted average price per share is the weighted grant price based on the closing market price of each of the stock grants related to each grant of stock unit awards. The weighted average fair value is the weighted average share price times the number of shares.
 
As of
September 30, 2018,
a total of
494
thousand shares of common stock were reserved for issuance under the Plan. As of
September 30, 2018,
the unamortized fair value of awards relating to outstanding SUAs and options was
$1.3
million, which is expected to be amortized over a weighted average period of
3.1
years.