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Note 3 - Inventories and Other Deferred Costs (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
March 31, 2020
   
December 31, 2019
 
   
(in thousands)
 
Raw materials
  $
4,859
    $
5,359
 
Work-in-process
   
5,987
     
6,238
 
Finished products
   
24,526
     
23,032
 
Other deferred costs
   
5,208
     
4,898
 
                 
Total inventory and other deferred costs
  $
40,580
    $
39,527