I waited to see what others said before weighing in...
First, I presume you intend the jargon meaning of CE: education hours required by a governing body to maintain a license or certification. (Most non-credit classes at my local vo-tech and community college are labeled "continuing ed".)
If you want to be easy, then most any education which requires either a high school education or adulthood is post-secondary. I would argue that in the jargon meaning above, CE is post-secondary because those certifications are generally post-secondary in nature themselves.
If you want to be semi-strict, some plans look at the education tax credits for what constitutes "post-secondary education", using the definition of an "eligible educational institution" which is: "any college, university, vocational school, or other post secondary educational institution eligible to participate in a student aid program run by the U.S. Department of Education." http://www.irs.gov/Individuals/Eligible-Educational-Inst This is a "safe" answer although it will exclude some training that is clearly vocational in nature.