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Note 5 - Long-term Investments (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Equity Method Investments [Table Text Block]
   
Ownership as of December 31,
2019
    
As of
December 31, 2019
    
As of
December 31, 2018
  
Pt. Tamron Akuatik Produk Industri
  
12%
     $
1,800,000
     $
-
  
Asahi Food, Inc.
  
49%
      
496,276
      
-
  
Long term investments
  
 
     $
2,296,276
     $
-