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Note 16 - Geographical Sales (Tables)
 6 Months Ended
Jun. 30, 2016
Segment Reporting [Abstract]  
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block] Geographical distribution of sales consisted of the following for the six and three months ended June 30, 2016 and 2015:

   
For six months ended June 30,
    
For three months ended June 30,
  
Geographical Areas
  
2016
    
2015
    
2016
    
2015
  
 
                        
China*
  
$
8,842,211
    
$
8,549,215
    
$
4,227,131
    
$
4,782,900
  
North America
    
30,010,043
      
35,403,369
      
12,786,668
      
20,284,862
  
Asia**
    
1,848,100
      
1,377,811
      
1,395,320
      
709,600
  
Europe
    
7,806,839
      
5,555,165
      
3,907,954
      
3,134,022
  
Australia
    
2,089,435
      
227,569
      
1,315,280
      
200,811
  
Hong Kong
    
296,695
      
47,207
      
277,012
      
41,532
  
Other countries
    
158,943
      
50,371
      
58,814
      
24,502
  
 
  
$
51,052,266
    
$
51,210,707
    
$
23,968,179
    
$
29,178,229
  
*   excluding Hong Kong
** excluding China