Analysis Of Income And Expense [Abstract]

BTS Group - Filing #701424

Concept	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31
Analysis of income and expense [abstract]
Revenue [abstract]
Interest income	—	—	884,000 SEK	—	—	—	1 264 SEK	—	—
Revenue	—	—	1 916 762 SEK	—	—	—	1 464 155 SEK	—	—
Material income and expense [abstract]
Finance income (cost)	—	—	16 309 SEK	—	—	—	13 907 SEK	—	—
Operating expense	—	—	1 611 562 SEK	—	—	—	1 399 549 SEK	—	—
Expenses by nature [abstract]
Classes of employee benefits expense [abstract]
Employee benefits expense	—	—	1 031 604 SEK	—	—	—	875 686 SEK	—	—
Depreciation, amortisation and impairment loss (reversal of impairment loss) recognised in profit or loss [abstract]
Depreciation and amortisation expense [abstract]
Depreciation and amortisation expense	—	—	103 953 SEK	—	—	—	90 822 SEK	—	—
Other expenses, by nature	—	—	525 699 SEK	—	—	—	433 041 SEK	—	—
Disclosure of attribution of expenses by nature to their function [text block]	—	—	—	—	—	—	—	—	—
Disclosure of attribution of expenses by nature to their function [abstract]
Disclosure of attribution of expenses by nature to their function [line items]
Share of profit (loss) of associates and joint ventures accounted for using equity method [abstract]
Share of profit (loss) of associates and joint ventures accounted for using equity method	—	—	320,000 SEK	—	—	—	353,000 SEK	—	—
Comprehensive income, continuing and discontinued operations [abstract]
Comprehensive income	272,000 SEK	64 726 SEK	279 700 SEK	214 702 SEK	35 226 SEK	0 SEK	60 171 SEK	4 41 SEK	94 956 SEK
Comprehensive income attributable to owners of parent, continuing and discontinued operations [abstract]
Comprehensive income, attributable to owners of parent	—	—	279 700 SEK	—	—	—	60 171 SEK	—	—