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Note 11 - Geographical Sales (Tables)
9 Months Ended
Sep. 30, 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 nine and three months ended September 30, 2019 and 2018:

   

Nine Months Ended September 30,

   

Three Months Ended September 30,

 
   

2019

   

2018

   

2019

   

2018

 
                                 

Geographical Areas

                               

North America

  $ 12,375,085     $ 40,224,090     $ 4,247,435     $ 13,237,312  

China

    11,792,589       -       4,958,128       -  

Australia

    -       11,075,268       -       548,580  

Asia*

    -       11,677,878       -       2,816,233  

Other countries

    410,172       182,693       117,273       145,702  
    $ 24,577,846     $ 63,159,929     $ 9,322,836     $ 16,747,827  

* excluding China