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Note 7 - Inventories (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
December 31,
201
7
    
December 31,
201
6
  
Raw materials
   $
2,632,415
     $
3,310,310
  
Work in Process
    
3,386,078
      
1,942,600
  
Finished Goods
    
13,347,620
      
13,889,328
  
Allowance for excess quantities
    
(500,181
 )    
(794,227
 )
Total inventories
   $
18,865,932
     $
18,348,011