Selling a small co?

Valuation of business items are based on potential and past performances.

To the OP, I suggest you look at getting someone to evaluate your business. Your asking price will be at least what you annual gross is plus a percentage of that gross if there is no assets like just the contracts. If you have assets (truck, trailer, office equipment), those have a market value added to them plus some extra and that is added to the total asking price.