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Related Party Transactions
 12 Months Ended
Dec. 31, 2012
Related Party Transactions [Abstract]  
Related Party Transactions
19.
Related Party Transactions
On July 31, 2012, we entered into a share purchase agreement with M&F, as further discussed in Note 4. Two of the M&F shareholders are individuals who were employed by Tennant prior to the transaction date and are no longer employed by Tennant as of the transaction date.
Our May 31, 2011 acquisition of Water Star includes installment payments totaling $1,500 to the former owners of Water Star, as further discussed in Note 4. As of the acquisition date, the former owners of Water Star are current employees of Tennant.
On May 18, 2009, we announced an exclusive technology license agreement with Global Opportunities Investment Group, LLC. A current employee of Tennant owns a minority interest in Global Opportunities Investment Group, LLC. Royalties under this license agreement are not material to our financial position or results of operations.
During the first quarter of 2008, we acquired Sociedade Alfa Ltda. and entered into lease agreements for certain properties owned by or partially owned by the former owners of this entity. Some of these individuals are current employees of Tennant. Lease payments made under these lease agreements are not material to our financial position or results of operations.