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I am not an expert in CoVid reopening procedures. I was on a webinar and came across some resources.
Here is what I do know:
NYS is requiring that each business have a written plan on file (it makes no mention of large or small, or number of employees). I came across this resource and thought it might be of help.
Here is what the state says-
  Each re-opening business must develop a written Safety Plan outlining how its workplace will prevent the spread of COVID-19. A business may fill out this template to fulfill the requirement, or may develop its own Safety Plan. This plan does not need to be submitted to a state agency for approval but must be retained on the premises of the business and must made available to the New York State Department of Health (DOH) or local health or safety authorities in the event of an inspection. Business owners should refer to the State’s industry-specific guidance for more information on how to safely operate. For a list of regions and sectors that are authorized to re-open, as well as detailed guidance for each sector, please visit: forward.ny.gov  
Here is the link to the template that the state is providing as of 5/20/20
Here is the link to the NYS reopening website.
Here is the link for industry specific stuff.
I am not an expert in the reopening phases but I thought this might be helpful. Please check with all your experts when making decisions. Good luck!  Stay Safe!