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Note 8 - Share-based Compensation (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
   
Three Months Ended September 30,
   
Nine Months Ended September 30,
 
   
2018
   
2017
   
2018
   
2017
 
                                 
Cost of sales
  $
-
    $
70
    $
12
    $
221
 
Selling, general and administrative expense
   
-
     
167
     
269
     
742
 
Total
  $
-
    $
237
    $
281
    $
963
 
Share-based Compensation, Stock Options, Activity [Table Text Block]
   
Options Outstanding
   
Weighted-
Average
Exercise Price
   
Weighted-
Average
Remaining
Contractual
Life
   
Aggregate
Intrinsic Value
 
   
 
 
 
 
 
 
 
 
(in years)
   
(In thousands)
 
Balance, December 31, 2017
   
24,000
    $
24.15
     
 
     
 
 
Options granted
   
-
     
-
     
 
     
 
 
Options exercised
   
-
     
-
     
 
     
 
 
Options canceled
   
-
     
-
     
 
     
 
 
Balance, September 30, 2018
   
24,000
     
24.15
     
 
     
 
 
Exercisable, September 30, 2018
   
24,000
     
24.15
     
1.50
    $
-
 
Schedule of Unvested Restricted Stock Units and Performance Share Awards Activity [Table Text Block]
   
Number of
RSUs and
PSAs
(1)
   
Weighted-
Average Grant
Date Fair Value
 
Unvested RSUs as of December 31, 2017
   
169,583
    $
9.50
 
PSAs granted
   
43,077
     
19.97
 
Unvested PSAs canceled
   
(3,085
)    
19.97
 
RSUs vested
   
(169,583
)    
9.50
 
Unvested PSAs as of September 30, 2018
   
39,992
     
19.97