It doesn't matter if a firm is large or small; local companies are usually well-covered by the local press. Coverage is generally more in-depth and ongoing than what you may find in the national sources. Newspaper and periodical articles can provide extensive and varied types of information on companies--for example, historical background, new ventures, marketing campaigns, analysis of financial situations, and biographical profiles of key executives. Remember that news comes in all forms. Be sure to check radio and television news in addition to newspapers.
In Nexis Uni, the search screen would look like this: