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Note 3 - Inventories (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
March 31, 2021
   
December 31, 2020
 
Raw materials
  $
4,946
    $
2,053
 
Finished goods
   
5,694
     
5,994
 
     
10,640
     
8,047
 
Reserve for obsolete inventory
   
(1,229
)    
(1,746
)
                 
Inventories, net
  $
9,411
    $
6,301