| Segment reporting | The following tables summarize segment information for the three
months ended December 31, 2018 and 2017:   
    |  |  | Three Months Ended December 31, |  |  
    |  |  | 2018 |  |  | 2017 |  |  
    | Revenues |  |  |  |  |  |  |  |  |  
    | Retail and Online |  | $ | 30,645,015 |  |  | $ | 21,293,471 |  |  
    | Manufacturing |  |  | 22,382,285 |  |  |  | 18,878,535 |  |  
    | Services |  |  | 168,640 |  |  |  | 196,058 |  |  
    |  |  | $ | 53,195,940 |  |  | $ | 40,368,064 |  |  
    | Gross profit |  |  |  |  |  |  |  |  |  
    | Retail and Online |  | $ | 13,576,283 |  |  | $ | 11,455,802 |  |  
    | Manufacturing |  |  | 5,601,658 |  |  |  | 4,752,568 |  |  
    | Services |  |  | 159,137 |  |  |  | 187,520 |  |  
    |  |  | $ | 19,337,078 |  |  | $ | 16,395,890 |  |  
    | Operating income |  |  |  |  |  |  |  |  |  
    | Retail and Online |  | $ | (238,652 | ) |  | $ | 2,231,476 |  |  
    | Manufacturing |  |  | 2,170,477 |  |  |  | 1,502,254 |  |  
    | Services |  |  | 158,667 |  |  |  | 187,058 |  |  
    |  |  | $ | 2,090,492 |  |  | $ | 3,920,788 |  |  
    | Depreciation and amortization |  |  |  |  |  |  |  |  |  
    | Retail and Online |  | $ | 788,251 |  |  | $ | 677,461 |  |  
    | Manufacturing |  |  | 693,518 |  |  |  | 718,444 |  |  
    | Services |  |  | – |  |  |  | – |  |  
    |  |  | $ | 1,481,769 |  |  | $ | 1,395,905 |  |  
    | Interest expense, net |  |  |  |  |  |  |  |  |  
    | Retail and Online |  | $ | 1,175,791 |  |  | $ | 2,022,407 |  |  
    | Manufacturing |  |  | 476,942 |  |  |  | 445,905 |  |  
    | Services |  |  | – |  |  |  | – |  |  
    |  |  | $ | 1,652,733 |  |  | $ | 2,468,312 |  |  
    | Net income before provision for income taxes |  |  |  |  |  |  |  |  |  
    | Retail and Online |  | $ | (1,272,417 | ) |  | $ | 4,052,595 |  |  
    | Manufacturing |  |  | 3,211,620 |  |  |  | 1,063,393 |  |  
    | Services |  |  | 158,667 |  |  |  | 187,058 |  |  
    |  |  | $ | 2,097,870 |  |  | $ | 5,303,046 |  |    
    |  |  | As of |  |  | As of |  |  
    |  |  | December 31, |  |  | September 30, |  |  
    |  |  | 2018 |  |  | 2018 |  |  
    | Total assets |  |  |  |  |  |  |  |  |  
    | Retail and Online |  | $ | 85,297,114 |  |  | $ | 88,799,584 |  |  
    | Manufacturing |  |  | 46,424,885 |  |  |  | 52,915,109 |  |  
    | Services |  |  | 87,292 |  |  |  | 57,703 |  |  
    |  |  | $ | 131,809,291 |  |  | $ | 141,772,396 |  |  
    | Intangible assets and goodwill |  |  |  |  |  |  |  |  |  
    | Retail and Online |  | $ | 42,968,314 |  |  | $ | 43,268,668 |  |  
    | Manufacturing |  |  | 336,596 |  |  |  | 343,914 |  |  
    | Services |  |  | – |  |  |  | – |  |  
    |  |  | $ | 43,304,910 |  |  | $ | 43,612,582 |  |  |