Called post void dribbling / leaking / incontinence...
It was explained to me that it was fairly common.
..."when the urine stream comes to an end, a natural reflex occurs that tightens the sphincter muscle and cuts off any further passage of urine.
However, this very useful mechanism can turn against you when you strain and rush to finish too fast. The prematurely closing sphincter keeps the remaining urine from flowing out. Once your body relaxes, so does the urinary sphincter, and at the most inopportune time, meaning when your penis is tucked away again, a small amount of urine leakage occurs"...
TauMed - A Symbol of Life - Virtual Health Community
Advice that HOOTIE gave is spot-on. That is the same advice that my Urologist suggested.