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Note 8 - Inventories (Tables)
 6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
    June 30,
2019		   December 31,
2018
Raw materials   $
12,381
     $
13,688
  
Work-in-process    
6,399
      
4,626
  
Finished goods    
8,747
      
6,819
  
Total   $
27,527
     $
25,133
  
                 
Inventories   $
22,986
     $
21,300
  
Other long-term assets   $
4,541
     $
3,833