What does "still in the black" mean?

[Julia]

Business English Lesson, Advanced Level

ESL/EFL Test #140 "Annual Report", question 10

Although the company's overall ......... was weak, its bottom line was still in the black.

(a) action
(b) activity
(c) performance
(d) progress

Business English Lesson, Advanced Level

ESL/EFL Test #140 "Annual Report", answer 10

Although the company's overall performance was weak, its bottom line was still in the black.

Correct answer: (c) performance

Your answer was: incorrect
Although the company's overall action was weak, its bottom line was still in the black.
_________________________

What does "still in the black" mean?

Thank you
Julia

[Conchita]

Was still in the black => (the company) was still prospering.

Some additional information from Dictionary.com:

Idiom(s):
in the black
On the credit side of a ledger; prosperous.

Online Etymology Dictionary:
To be in the black (1928) is from the accounting practice of recording credits and balances in black ink.