I have been strongly recommending ATRI on the Motley Fool Hidden Gem service for the last 2 years, starting a message board there (should now be available to all to view). HG could not recommend ATRI because the volume is too low. They have big problems already with the large POP when issues are recommended (ones with much larger trading volumes than Atrion.)
But it does have an informal following there. We own it in all our managed accounts at Freedom Mountain Investments.