| All figures in €'000 | Notes | 2020 | 2019 | 
| Revenue | (8) | 745,524 | 689,561 | 
| Other revenue | (9) | 21,799 | 19,199 | 
| Total revenue | 767,323 | 708,760 | |
| Inventory changes | (10) | 7,284 | 3,940 | 
| Commission expenses | (11) | -397,040 | -369,925 | 
| Interest expenses | (12) | -412 | -615 | 
| Valuation result/loan loss provisions | (13) | -3,021 | -896 | 
| Personnel expenses | (14) | -147,971 | -135,717 | 
| Depreciation and impairments | (15) | -27,691 | -26,371 | 
| Other operating expenses | (16) | -142,838 | -135,071 | 
| Earnings from investments accounted for using the equity method | (17) | 3,729 | 2,998 | 
| Earnings before interest and taxes (EBIT) | 59,363 | 47,104 | |
| Other interest and similar income | 1,311 | 767 | |
| Other interest and similar expenses | -4,126 | -3,145 | |
| Valuation result not relating to operating activities | -213 | 43 | |
| Finance cost | (18) | -3,028 | -2,335 | 
| Earnings before taxes (EBT) | 56,335 | 44,770 | |
| Income taxes | (19) | -13,093 | -7,844 | 
| Net profit | 43,241 | 36,925 | |
| of which attributable to | |||
| owners of the parent company | 43,253 | 37,327 | |
| minority interests | -11 | -402 | |
| Earnings per share in € | (20) | ||
| basic/diluted | 0.40 | 0.34 | |
| All figures in €'000 | Notes | 2020 | 2019 | 
| Net profit | 43,241 | 36,925 | |
| Gains/losses due to the revaluation of defined benefit obligations | -4,975 | -7,038 | |
| Deferred taxes on non-reclassifiable gains/losses | (19) | 1,528 | 2,008 | 
| Non-reclassifiable gains/losses | -3,447 | -5,030 | |
| Other comprehensive income | -3,447 | -5,030 | |
| Total comprehensive income | 39,794 | 31,895 | |
| of which attributable to | |||
| owners of the parent company | 39,805 | 32,297 | |
| minority interests | -11 | -402 | |