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Note 7 - Inventories, Net (Tables)
 6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
June 30,
201
9
    
December 31,
2018
  
Raw materials
   $
2,085,908
     $
1,994,741
  
Work in process
    
3,057,682
      
3,052,224
  
Finished goods
    
15,508,804
      
14,934,581
  
In Transit
    
293,136
      
480,716
  
Allowance for excess quantities
    
(1,679,438
 )    
(454,774
 )
Total inventories
   $
19,266,094
     $
20,007,488