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Note 7 - Inventories, Net (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
September
30
,
201
8
   
December
31,
201
7
 
Raw materials
  $
2,300,859
    $
2,632,415
 
Work in process
   
3,038,275
     
3,386,078
 
Finished goods
   
15,006,551
     
13,347,620
 
Allowance for excess quantities
   
(513,866
)    
(500,181
)
Total inventories
  $
19,831,819
    $
18,865,932