The fair value of long-term debt was determined using discounted cash flow models based on the relevant forward interest rate yield curves. The fair value of finance lease obligations was determined using discounted cash flow models on market interest rates available to the Company for similar transactions at the relevant date.
Due to their short maturity and the current low level of interest rates, the carrying amounts of credit lines and bank overdrafts approximate fair value.
8. Financial result
| Three months ended June 30, | ||||
| 2018 | 2017 | |||
| (€ in thousands) | ||||
| Interest expense | (549) | (2) | ||
| Finance lease obligations | (23) | (8) | ||
| Long-term debt | (236) | 8 | ||
| Expense from revaluation of derivative financial instruments | (225) | -- | ||
| Other | (65) | (2) | ||
| Interest income | 11 | 3 | ||
| Income from bond funds | 9 | -- | ||
| Other | 2 | 3 | ||
| Financial result | (538) | 1 | ||
| Six months ended June 30, | ||||
| 2018 | 2017 | |||
| (€ in thousands) | ||||
| Interest expense | (592) | (49) | ||
| Finance lease obligations | (59) | (18) | ||
| Long-term debt | (467) | (29) | ||
| Other | (66) | (2) | ||
| Interest income | 732 | 7 | ||
| Income from bond funds | 14 | 1 | ||
| Income from revaluation of derivative financial instruments | 716 | -- | ||
| Other | 2 | 6 | ||
| Financial result | 140 | (42) | ||
