Early, side-curtain, 948 Midgets, if unmolested, are holding value nicely.
~This Article~ claims a value of $3000 to $10000 for a very nice one. I'm not sure how your "pretty decent" one compares to that, but at least it's a range, even if a wide one. Maybe your car would be on the lower end of that range if you find the right buyer and spruce it up as best as you can.
As always, it can be a buyer's market during a difficult economy. I own a second home that I'm considering selling, but not until the economy gets a bit better.
For what it's worth, I think the most desirable versions of these cars are the '73 "RWA" 1275 cars. I bought a "barn find" '73 Midget that ran and was very solid for under $300 a few months ago.
This is it. Part of the reason I got this deal was due to my own patience added to a buyer who was very motivated.
On the other hand, if you spruce your's up, set a higher price and are patient, you might find that buyer who really wants an early Midget. You've got nothing to lose by starting high and seeing what happens.