Old Style Website Not Mobile Friendly
Simply put this website was designed quite a few years ago, and as a result has all of the classic signs of being outdated.
This combined with the fact that it's not mobile friendly (doesn't work correctly when viewed on a mobile device) means that Google is severely penalising this website. Google switched to focusing on mobile users recently as they make up a large percentage of the local searches performed, and so it's one of the most essential changes to make to improve your SEO.
This website should be upgraded to a platform like WordPress, with a theme that's responsive and works well on mobile.