“Often, a suggestion made by one of the female staff during meetings the owner attended would be shot down, only to re-appear in a week or two as his own brilliant idea. It happened so often a few of us started joking privately about noting our suggestions in the calendar to see exactly how many days later it would take for our ideas to go from ridiculously impossible to sheer genius.”

This happens in most management scenarios, regardless of the person's sex.

What you need to do is NOT take ownership of the idea, as this means nothing. You should just be happy that the company incorporates the idea moving forward, as it means the idea had merit.

Also the best ideas are often immediately rejected by the status quo, only to be excepted later as situations evolve... or as the submitter of the idea is able to make a better case over time.

Now move onto the next issue and stop worrying if you or the other board member got the gold star.