From MIT:
The Living Wage Calculator was originally developed as an alternative to federal poverty standards in 2003 by Dr. Amy K. Glasmeier - professor of Economic Geography and Regional Planning at MIT’s Department of Urban Studies and Planning (DUSP) - and Dr. Tracey Farrigan, a graduate student at the time. Today, the data featured on the Calculator is produced and donated by the Living Wage Institute.

You can gather living wage data at the county level for Idaho as well as the rest of the U.S.

You can find the calculator here.

To learn about how the data is collected, go to this page.