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Related Party Transactions	6 Months Ended
Related Party Transactions	Jun. 30, 2011
Related Party Transactions [Abstract]
Related Party Transactions	17. 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. We have 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 second 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 these entities. 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.

The entire disclosure for related party transactions, including the nature of the relationship(s), a description of the transactions, the amount of the transactions, the effects of any change in the method of establishing the terms of the transaction from the previous period, stated interest rate, expiration date, terms and manner of settlement per the agreement with the related party, and amounts due to or from related parties. If the entity and one or more other entities are under common ownership or management control and this control affects the operating results or financial position, disclosure includes the nature of the control relationship even if there are no transactions between the entities. Disclosure may also include the aggregate amount of current and deferred tax expense for each statement of earnings presented where the entity is a member of a group that files a consolidated tax return, the amount of any tax related balances due to or from affiliates as of the date of each statement of financial position presented, the principal provisions of the method by which the consolidated amount of current and deferred tax expense is allocated to the members of the group and the nature and effect of any changes in that method. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

+ References

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-Publisher SEC
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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+ Details