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. Segment reporting
The following table summarizes segment reporting. The sum of the amounts of the two segments equals the total for the Group in each of the periods.
| Quarter Ended March 31, | ||||||||
| 2016 | 2015 | |||||||
| (€ in thousands) | ||||||||
| SYSTEMS | SERVICES | SYSTEMS | SERVICES | |||||
| Revenues | 2,783 | 2,087 | 2,817 | 2,772 | ||||
| Gross profit | 693 | 638 | 772 | 1,107 | ||||
| Gross profit in % | 24.9% | 30.6% | 27.4% | 39.9% | ||||
