on this issue
There is nothing at all wrong with your choice of words "idea on this issue", it's perfectly acceptable. I just wanted to point out that AmE favors the word 'opinion' over 'idea' when describing how you feel about an issue.
Google results for "idea on the issue" - 2,200,000
Google results for "opinion on the issue" - 21,000,000
(not a teacher, just a language lover)
Student or Learner