A violation of this chapter is hereby declared to be an offense punishable by a fine not less than $50 nor more than $350 or imprisonment for a period not to exceed 15 days, or both, for conviction of a first offense; for conviction of a second offense, both of which were committed within a period of five years, punishable by a fine not less than $350 nor more than $700 or imprisonment for a period not to exceed 15 days, or both; and upon conviction of a third or subsequent offense, all of which were committed within a period of five years, punishable by a fine not less than $700 nor more than $1,000 or imprisonment for a period not to exceed 15 days, or both. Each week's continued violation shall constitute a separate, additional violation.