Financial liabilities
| December 31, 2017 | December 31, 2016 | December 31, 2015 | ||||||||||||||||||||||
| Financial liabilities at fair value through profit or loss | Financial liabilities at amortized cost | Financial liabilities at fair value through profit or loss | Financial liabilities at amortized cost | Financial liabilities at fair value through profit or loss | Financial liabilities at amortized cost | |||||||||||||||||||
| Trade and other payables | $ | – | $ | 6,409,094 | $ | – | $ | 5,994,904 | $ | – | $ | 5,372,684 | ||||||||||||
| Loans and borrowings and notes payable | – | 26,572,080 | – | 27,802,729 | – | 28,136,250 | ||||||||||||||||||
| Derivatives financial liabilities | 1,859,700 | – | 794,235 | – | 2,733,836 | – | ||||||||||||||||||
| Total financial liabilities | $ | 1,859,700 | $ | 32,981,174 | $ | 794,235 | $ | 33,797,633 | $ | 2,733,836 | $ | 33,508,934 | ||||||||||||