Can I display card on detail page ?

Have you see this video and doc?

Video: https://laracasts.com/series/laravel-nova-mastery/episodes/13

Docs: https://nova.laravel.com/docs/1.0/customization/cards.html

Bonus Article/Tutorial: https://medium.com/@richartkeil/how-to-write-custom-laravel-nova-cards-without-making-them-a-package-f377f39c4071

@BRAUNSON - Yes, I known that but I need to show card on detail page not index of resource.

Try this:

public function cards(Request $request)
    {
        return [
            (new YourCard)->onlyOnDetail(),
        ];
    }