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Capital Structure, Financial Risk and Related Items - Treasury Shares (Details) | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2019 shares | Mar. 31, 2016 shares | Dec. 31, 2021 DKK (kr) item shares | Dec. 31, 2020 DKK (kr) shares | Dec. 31, 2019 DKK (kr) shares | Apr. 13, 2021 DKK (kr) shares | Mar. 29, 2019 DKK (kr) shares | Mar. 28, 2017 DKK (kr) | Mar. 17, 2016 DKK (kr) shares
Number of shares |  |  |  |  |  |  |  |  |
Number of shares at beginning of period | shares |  |  |  | 3,277,500 |  |  |  |  |
Number of shares at end of period | shares |  |  |  |  | 3,277,500 |  |  |  |
Share capital |  |  |  |  |  |  |  |  |
Share capital, at beginning of period |  |  | kr 65,500,000 | kr 65,100,000 | kr 61,500,000 |  |  |  |
Purchase of treasury shares |  |  | 447,000,000 |  |  |  |  |  |
Share capital, at end of period |  |  | kr 65,700,000 | kr 65,500,000 | kr 65,100,000 |  |  |  |
Cost |  |  |  |  |  |  |  |  |
Number of authorization | item |  |  | 2 |  |  |  |  |  |
Number of shares authorized to be repurchased | shares |  |  |  |  |  |  |  |  | 500,000
Nominal value of shares repurchases |  |  |  |  |  | kr 750,000 |  | kr 500,000 | kr 500,000
Treasury shares [member] |  |  |  |  |  |  |  |  |
Number of shares |  |  |  |  |  |  |  |  |
Number of shares at beginning of period | shares |  |  | 132,106 | 163,921 | 177,550 |  |  |  |
Purchase of treasury shares. | shares | 170,000 | 30,000 | 200,000 | 0 | 0 |  |  |  |
Shares used for funding RSU program | shares |  |  | (43,781) | (31,815) | (13,629) |  |  |  |
Number of shares at end of period | shares |  |  | 288,325 | 132,106 | 163,921 |  |  |  |
Share capital |  |  |  |  |  |  |  |  |
Share capital, at beginning of period |  |  | kr 100,000 | kr 200,000 | kr 200,000 |  |  |  |
Purchase of treasury shares |  |  | 200,000 |  |  |  |  |  |
Shares used for funding RSU program |  |  |  | (100,000) |  |  |  |  |
Share capital, at end of period |  |  | kr 300,000 | kr 100,000 | kr 200,000 |  |  |  |
Proportion of share capital |  |  |  |  |  |  |  |  |
Proportion of share capital, at beginning of period |  |  | 0.20% | 0.30% | 0.30% |  |  |  |
Proportion of share capital on purchase of treasury shares |  |  | 0.30% |  |  |  |  |  |
Proportion of share capital on shares used for funding RSU program |  |  | (0.10%) | (0.10%) |  |  |  |  |
Proportion of share capital, at end of period |  |  | 0.40% | 0.20% | 0.30% |  |  |  |
Cost |  |  |  |  |  |  |  |  |
Cost, at beginning of period |  |  | kr 154,000,000 | kr 192,000,000 | kr 208,000,000 |  |  |  |
Purchase of treasury shares |  |  | 447,000,000 |  |  |  |  |  |
Shares used for funding RSU program |  |  | (51,000,000) | (38,000,000) | (16,000,000) |  |  |  |
Cost at end of period |  |  | kr 550,000,000 | kr 154,000,000 | kr 192,000,000 |  |  |  |
RSU |  |  |  |  |  |  |  |  |
Number of shares |  |  |  |  |  |  |  |  |
Purchase of treasury shares. | shares |  |  | 200,000 |  |  |  |  |  |
Share capital |  |  |  |  |  |  |  |  |
Purchase of treasury shares |  |  | kr 447,000,000 |  |  |  |  |  |
Proportion of share capital |  |  |  |  |  |  |  |  |
Proportion of share capital on purchase of treasury shares |  |  | 0.30% |  |  |  |  |  |
First authorization |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  |  |  |
Number of shares authorized to be repurchased | shares |  |  |  |  |  |  | 500,000 |  |
Nominal value of shares repurchases |  |  |  |  |  |  | kr 500,000 |  |
Share repurchased | shares |  |  | 255,000 |  |  |  |  |  |
Share repurchased amount |  |  | kr 255,000 |  |  |  |  |  |
Shares available for repurchase | shares |  |  | 830,000 |  |  |  |  |  |
Shares available for repurchase amount |  |  | kr 830,000 |  |  |  |  |  |
Second authorization |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  |  |  |
Number of shares authorized to be repurchased | shares |  |  |  |  |  | 500,000 |  |  |
Nominal value of shares repurchases |  |  |  |  |  | kr 500,000 |  |  |
Share repurchased | shares |  |  | 170,000 |  |  |  |  |  |
Share repurchased amount |  |  | kr 170,000 |  |  |  |  |  |

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