If any vendor, during any reporting period, collects as a tax an amount in excess of three percent of all taxable sales made prior to January 1, 2001, and two and ninety one-hundredths percent of all taxable sales made on or after January 1, 2001, such vendor shall remit to the executive director of the department of revenue the full net amount of the tax imposed in this part 1 and also such excess. The retention by the retailer or vendor of any excess of tax collections over the said percentage of the total taxable sales of such retailer or vendor or the intentional failure to remit punctually to the executive director the full amount required to be remitted by the provisions of this part 1 is declared to be unlawful and constitutes a misdemeanor.