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Note 11 - Geographical Sales (Tables)
3 Months Ended
Mar. 31, 2019
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, 2019 and 2018:

   

Three Months Ended March 31,

 
   

2019

   

2018

 
                 

Geographical Areas

               

North America

  $ 4,194,550     $ 12,717,485  

China

    6,278,704       -  

Australia

    -       3,660,465  

Asia*

    -       5,925,522  

Other countries

    187,554       -  
    $ 10,660,808     $ 22,303,472  

* excluding China