714.2 Degrees of theft.
1. The theft of property exceeding ten thousand dollars in value, or the theft of property from the person of another, or from a building which has been destroyed or left unoccupied because of physical disaster, riot, bombing, or the proximity of battle, or the theft of property which has been removed from a building because of a physical disaster, riot, bombing, or the proximity of battle, is theft in the first degree. Theft in the first degree is a class "C" felony.
2. The theft of property exceeding one thousand dollars but not exceeding ten thousand dollars in value or theft of a motor vehicle as defined in chapter 321 not exceeding ten thousand dollars in value, is theft in the second degree. Theft in the second degree is a class "D" felony. However, for purposes of this subsection, "motor vehicle" does not include a motorized bicycle as defined in section 321.1, subsection 40, paragraph "b".
3. The theft of property exceeding five hundred dollars but not exceeding one thousand dollars in value, or the theft of any property not exceeding five hundred dollars in value by one who has before been twice convicted of theft, is theft in the third degree. Theft in the third degree is an aggravated misdemeanor.
4. The theft of property exceeding two hundred dollars in value but not exceeding five hundred dollars in value is theft in the fourth degree. Theft in the fourth degree is a serious misdemeanor.
802.5 Extension for fraud, fiduciary breach.
If the period prescribed in sections 802.3 and 802.4 has expired, prosecution may nevertheless be commenced for any offense a material element of which is either fraud or a breach of fiduciary obligation within one year after discovery of the offense by an aggrieved party or by a person who has legal duty to represent an aggrieved party and who is not a party to the offense, but in no case shall this provision extend the period of limitation otherwise applicable by more than three years.
I could not find a section specifically titled "Embezzlement" so theft is cited.
It is "highly doubtful" you were in a "Fiduciary" relationship with your employer.
Do you see any element here to indicate fraud for what you exactly did?
http://www.legis.state.ia.us/IACODE/2001/714/8.html
If not, 3 years is the SOL then to commence a prosecution.