As a part of ASEAN, Indonesia citizens are exempt from Vietnam visa for 30 days. For stay of longer than 30 days, Indonesian nationals may have 2 options: Visit Vietnam embassy in Indonesia or apply for a visa on arrival to Vietnam from Indonesia online. Indonesian citizens may apply for both tourist and business visa to Vietnam for the stay of 1 to 6 months from Indonesia. Please check this link for visa fee for Indonesian citizens.

All the information for getting a visa from Vietnam embassy in Indonesia can be found here:

http://www.vietnamembassy-indonesia.org/