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Note 7 - Inventories, Net (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
September
30
,
201
9
    
December
31,
201
8
  
Raw materials
   $
1,852,768
     $
1,994,741
  
Work in process
    
3,124,781
      
3,052,224
  
Finished goods
    
13,462,890
      
14,934,581
  
In transit
    
148,183
      
480,716
  
Allowance for excess quantities
    
(243,216
 )    
(454,774
 )
Total inventories
   $
18,345,406
     $
20,007,488