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Note 11 - Geographical Sales (Tables)
3 Months Ended
Mar. 31, 2018
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 three months ended March 31, 2018 and 2017:

   
Three Months Ended March 31,
 
Geographical Areas
 
2018
   
2017
 
North America
 
$
12,717,485
   
$
12,529,632
 
Europe
   
-
     
2,262,865
 
Australia
   
3,660,465
     
2,449,454
 
Asia
   
5,925,522
     
815,071
 
 
 
$
22,303,472
   
$
18,057,022