It is not an idiom - it means what it seems to mean. This is a very old proverb (already considered old in the 1500's!). It comes from the fact that some people are greedy. If you give them an inch of something, they'll want even more.
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Some one would sponsor the person marching and give them a dime for every mile they walked or something similar.The march of dimes in a charity that helps improve health of babies.
The Three Mile Island accident in 1979
the fastest mile is 3:43
Three Mile Island The accident at the Three Mile Island Unit 2 (TMI-2) nuclear power plant near Middletown, Pennsylvania occurred on March 28, 1979.
Three Mile Island, Pa, 1979