Should the board of directors of a non-profit keep detailed executive minutes?
Minutes should not be an exact transcript of the meeting but should provide enough information to reflect that the board gave appropriate consideration to the issues. Minutes should include a recitation of the date/time/place of the meeting, whether notice was given (or waived), whether the meeting is a regular or special one, naming everyone who attended (and whether that provided a quorum), actions taken (and an outline of the discussion for significant issues) and voting on the issue.
As you already have an attorney, ask him/her to guide you as to minute-taking best practices. Or, there may be local organizations like Governance Matters (based in New York -- see www.governancematters.org) that provide workshops and seminars on best practices for non-profits.