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Related Party Transactions
 12 Months Ended
Dec. 31, 2011
Related Party Transactions (Details) [Abstract]  
Related Party Transactions
20.  
Related Party Transactions
 
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 September 15, 2010, we entered into an agreement with a then current employee for the right to manufacture and sell a product developed by the employee prior to becoming employed by Tennant. As of December 31, 2010, this individual was no longer an employee of Tennant. Product fee payments made under this agreement are not material to our financial position or results of operations.
 
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 Activeion Cleaning Solutions, LLC (“Activeion”), a wholly-owned subsidiary of 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.