Self-employed work at my home office in WA. I do this for a company located in ID 500 miles from my office. Take 2-4 trips a year to the ID office for reviews. File ID?

Do I need to file an Idaho return. All work except these reviews is done in my WA office. I saw on Turbo Tax Idaho I do not need to file if income not over $2,500.00. With the deductions allowed including the health payments for spouse & I my business 0's out. I pay Social Security tax. I turned 65 October, 2018, husband 69. T