Small company gives paid sick/vaca time to salary employees, are the full time hourly employees not entitled by law to the same benefits?

For example, the employer may give paid vacation days to all full-time employees without offering the same benefit to part-time or temporary workers. The employer cannot, however, give paid vacation days to some full-time workers but not to others. ^^This is a statement in the article I just read. My question is if I work for a small owned business, around 20 employees, is this company allowed to offer paid sick and vacation time to the salary workers yet not to the full time hourly employees? If we are working the same amount hours, shouldn't the hourly employees be given the same honor by law? And if so, what are the steps to take to ensure my place of employment complies with all mandated state laws in regards to this? Thank you.