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Note 6 - Inventories
3 Months Ended
Mar. 31, 2020
Notes to Financial Statements  
Inventory Disclosure [Text Block]
6.
INVENTORIES
 
The components of inventories are as follows:
 
   
March 31,
   
December 31,
 
   
2020
   
2019
 
Raw materials
  $
50,011
    $
47,936
 
Work in progress
   
28,784
     
27,065
 
Finished goods
   
25,518
     
32,275
 
Inventories
  $
104,313
    $
107,276