You may want to contact IDEA directly to ask that question. I’m not sure if they will be able to gain access to the website if they are not a member. Therefore, even if you linked to the exercise, they may not be able to view it. Also be careful about copying content from other sites. There can be copywrite issues with that.
Two sites I’ve used in the past to do the same are FitnessBuilder.com and PTontheNet. Both have websites and apps, so you can use them anywhere. Both allow you to create programs for clients, save client information and print out exercises, descriptions and even videos of how to execute the movements. You can also add and customize exercises. You can also add your business logo to the printed “homework” for clients.
Hope that helps,