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Segment reporting (Tables)
12 Months Ended
Sep. 30, 2018
Segment Reporting [Abstract]  
Schedule of revenue by major product categories
  For the years ended September 30, 
  2018  2017  2016 
          
Shiitake $16,753,076  $16,249,672  $14,658,325 
Mu Er  12,190,340   9,239,920   6,015,519 
Other edible fungi and other agricultural products  875,672   1,176,009   41,386 
Total $29,819,088  $26,665,601  $20,715,230 
Schedule of long-lived assets
  For the years ended September 30, 
  2018  2017  2016 
          
Revenue from China $27,146,942  $24,121,216  $17,983,566 
Revenue from foreign countries  2,672,146   2,544,385   2,731,664 
Total Revenue $29,819,088  $26,665,601  $20,715,230