No municipality, and no governing board thereof, may issue bonds without being first authorized to do so by a vote equal to sixty percent of all the qualified voters of such municipality voting upon the question of such issue except:
Nothing herein may be deemed to prevent any municipality from appropriating funds for or financing out of taxes, special assessments, or utility revenues any work incidental to any such improvement, in the manner and to the extent otherwise permitted by law.
N.D.C.C. § 21-03-07