While I don't currently own many shares of SMED, it's worth a study at this level at this time.
The recent insider buying may seem trivial to some, and for any large company would be meaningless. But for Sharps size and market cap, it seems quite a sign that something is happening behind the curtain.
Could there be a huge contract in draft. Perhaps a buyout bid from Stericycle or some other comp? Could it be increasing regulation on disposal of this type of waste?