Just connect to the database and run this SQL query:
SELECT email, `level` FROM qa_users WHERE `level` >= 100
You can use this as a reference:
QA_USER_LEVEL_BASIC = 0
QA_USER_LEVEL_APPROVED = 10
QA_USER_LEVEL_EXPERT = 20
QA_USER_LEVEL_EDITOR = 50
QA_USER_LEVEL_MODERATOR = 80
QA_USER_LEVEL_ADMIN = 100
QA_USER_LEVEL_SUPER = 120