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Note 11 - Geographical Sales (Tables)
 9 Months Ended
Sep. 30, 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 nine and three months ended September 30, 2018 and 2017:

   

Nine Months Ended September 30,

    

Three Months Ended September 30,

  
   

2018

    

2017

    

2018

    

2017

  
                                 

Geographical Areas

                                

North America

   $ 40,224,090     $ 37,158,028     $ 13,237,312     $ 11,900,592  

Europe

     -       3,456,045       -       -  

Australia

     11,075,268       24,690,606       548,580       17,992,912  

Asia*

     11,677,878       5,020,746       2,816,233       3,329,121  

Hong Kong

     -       461,943       -       -  

Other countries

     182,693       26,046       145,702       -  
                                 
    $ 63,159,929     $ 70,813,414     $ 16,747,827     $ 33,222,625  

 * excluding Hong Kong