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Note 8 - Inventories (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
December 31,
201
8
    
December 31,
201
7
  
Raw materials
   $
1,994,741
     $
2,632,415
  
Work in Process
    
3,052,224
      
3,386,078
  
Finished Goods
    
14,934,581
      
13,347,620
  
In Transit
    
480,716
      
 
  
Allowance for excess quantities
    
(454,774
 )    
(500,181
 )
Total inventories
   $
20,007,488
     $
18,865,932