Note 22 — Trade and Other Payables
Details of trade and other payables at December 31 are as follows:
| 2017 | 2016 | 2015 | ||||||||||
| Accrued expenses | $ | 2,716,238 | $ | 2,789,476 | $ | 2,863,516 | ||||||
| Interest payables | 1,061,346 | 796,175 | 560,835 | |||||||||
| Trade account payables | 2,593,584 | 2,295,501 | 1,834,773 | |||||||||
| Other payables - social security payments | 18,329 | 33,397 | 113,560 | |||||||||
| Total trade and other payables, current | $ | 6,389,497 | $ | 5,914,549 | $ | 5,372,684 | ||||||
| Other payables - social security payments | $ | 3,568 | $ | 63,143 | $ | – | ||||||
| Other payables - property taxes payments | 16,029 | 17,212 | – | |||||||||
| Total trade and other payables, non-current | $ | 19,597 | $ | 80,355 | $ | – | ||||||
Book values approximate fair value at December 31, 2017, 2016 and 2015.