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Note 6 - Inventories
 12 Months Ended
Dec. 31, 2018
Notes to Financial Statements  
Inventory Disclosure [Text Block]
6.
INVENTORIES
(In Thousands)
 
    December 31
    2018   2017
         
Finished goods   $
5,677
     $
4,415
  
Work-in-process    
3,105
      
2,501
  
Raw materials    
8,103
      
8,078
  
Provisions for obsolete inventories    
(6,597
 )    
(5,664
 )
                 
Total   $
10,288
     $
9,330
  
 
The Company periodically evaluates inventory and establishes provisions for obsolescence, excess quantities, slow-moving goods, and for other impairment of value. The following table shows the movement of provisions for obsolete inventories.
(In Thousands)
 
    Years Ended December 31
    2018   2017   2016
             
Balance at beginning of year   $
5,664
     $
5,041
     $
3,664
  
Charge to cost and expenses    
1,328
      
642
      
1,527
  
Other deductions    
(395
 )    
(19
 )    
(150
 )
                         
Balance at end of year   $
6,597
     $
5,664
     $
5,041