If you are between 14 1/2 and 17, you have to get a "Supervised Instruction Permit" (SIP) and complete an approved driver training program. The program requires you to make it through a four-month, violation-free supervised instruction period successfully, always with an over-21 supervisor who holds a full license. Should your four-month period end, you can still drive on your SIP as long has it has not yet expired and as long as you are younger than 17 and obey the restrictions of the SIP (eg being supervised). Full information for teen drivers in Idaho is here