If the account qualifies as community property, at the death of one spouse you receive a step-up in basis for the entire amount. See this web reference for a good summary:
http://www.calcpa.org/public-resources/ask-a-cpa/home-property/tax-issues/do-i-get-a-step-up-on-my-s...
Since the account passed to you at your husband's death, the sale is reported only on your tax return. (If he died during 2015, you may still file your 2015 return as MFJ.)
Gain on the sale of inherited stock is always long term.
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
