| Intangible assets | Intangible
assets as of December 31, 2018 and 2017:    
    |  |  |  |  |  | December
    31, 2018 |  |  |  |  | December
    31, 2017 |  |  
    |  |  | Estimated
    Useful Life in Years |  |  | Gross Carrying
        Amount  |  |  | Accumulated
    Amortization |  |  | Net
                                          Carrying
        Amount  |  |  | Gross Carrying Value
         |  |  | Accumulated
    Amortization |  |  | Net
                                          Carrying Value
         |  |  
    |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
    | Amortizing
    Intangible Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
    | Customer
    Relationships |  | 3 to
    5 |  |  | $ | 8,072,400 |  |  | $ | (3,596,562 | ) |  | $ | 4,475,838 |  |  | $ | 8,072,400 |  |  | $ | (1,345,191 | ) |  | $ | 6,727,209 |  |  
    | Trademarks
    and Patent |  | 2 to 8 |  |  |  | 195,520 |  |  |  | (116,552 | ) |  |  | 78,968 |  |  |  | 195,520 |  |  |  | (77,448 | ) |  |  | 118,072 |  |  
    | Dispensary
    Licenses |  | 14 |  |  |  | 10,270,000 |  |  |  | (1,984,632 | ) |  |  | 8,285,368 |  |  |  | 10,270,000 |  |  |  | (1,283,751 | ) |  |  | 8,986,249 |  |  
    | Management
    Service Agreement |  | 15 |  |  |  | 370,332 |  |  |  | (31,891 | ) |  |  | 338,441 |  |  |  | 6,621,580 |  |  |  | - |  |  |  | 6,621,580 |  |  
    |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
    | Total
    Amortizing Intangible Assets |  |  |  |  |  | 18,908,252 |  |  |  | (5,729,638 | ) |  |  | 13,178,614 |  |  |  | 25,159,500 |  |  |  | (2,706,390 | ) |  |  | 22,453,110 |  |  
    |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
    | Non-Amortizing
    Intangible Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
    | Trade
    Name |  | Indefinite |  |  |  | 5,320,000 |  |  |  | - |  |  |  | 5,320,000 |  |  |  | 5,320,000 |  |  |  | - |  |  |  | 5,320,000 |  |  
    |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
    | Total
    Non-Amortizing Intangible Assets |  |  |  |  |  | 5,320,000 |  |  |  | - |  |  |  | 5,320,000 |  |  |  | 5,320,000 |  |  |  | - |  |  |  | 5,320,000 |  |  
    |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
    | Total
    Intangible Assets, Net |  |  |  |  | $ | 24,228,252 |  |  | $ | (5,729,638 | ) |  | $ | 18,498,614 |  |  | $ | 30,479,500 |  |  | $ | (2,706,390 | ) |  | $ | 27,773,110 |  |  | 
| Estimated amortization expense of intangible assets | Based solely on the amortizable intangible
assets recorded at December 31, 2018, the Company estimates amortization expense for the next five years to be as follows:    
    |  |  | Year Ending December 31, |  |  
    |  |  | 2019 |  |  | 2020 |  |  | 2021 |  |  | 2022 |  |  | 2023 and thereafter |  |  | Total |  |  
    | Amortization expense |  | $ | 1,452,361 |  |  | $ | 1,452,361 |  |  | $ | 1,414,017 |  |  | $ | 1,413,257 |  |  | $ | 8,996,850 |  |  | $ | 14,728,846 |  |  |