Deferred Revenue, foreign currency impact on liability balance

No definition available.

Name:	tnc_DeferredRevenueForeignCurrencyImpact
Namespace Prefix:	tnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of revenue to be recognized for future performance obligations satisfied for which consideration from customer has been received or is due after the fifth fiscal year following the latest fiscal year.

+ References

No definition available.

+ Details

Name:	tnc_RevenueFromContractWithCustomerFuturePerformanceObligationsSatisfiedDueThereafter
Namespace Prefix:	tnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of revenue to be recognized for future performance obligations satisfied for which consideration from customer has been received or is due in the fifth fiscal year following the latest fiscal year.

+ References

No definition available.

+ Details

Name:	tnc_RevenueFromContractWithCustomerFuturePerformanceObligationsSatisfiedDueinFiveYears
Namespace Prefix:	tnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of revenue to be recognized for future performance obligations satisfied for which consideration from customer has been received or is due in the fourth fiscal year following the latest fiscal year.

+ References

No definition available.

+ Details

Name:	tnc_RevenueFromContractWithCustomerFuturePerformanceObligationsSatisfiedDueinFourYears
Namespace Prefix:	tnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of revenue to be recognized for future performance obligations satisfied for which consideration from customer has been received or is due in the third fiscal year following the latest fiscal year.

+ References

No definition available.

+ Details

Name:	tnc_RevenueFromContractWithCustomerFuturePerformanceObligationsSatisfiedDueinThreeYears
Namespace Prefix:	tnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of revenue to be recognized for future performance obligations satisfied for which consideration from customer has been received or is due in the second fiscal year following the latest fiscal year.

+ References

No definition available.

+ Details

Name:	tnc_RevenueFromContractWithCustomerFuturePerformanceObligationsSatisfiedDueinTwoYears
Namespace Prefix:	tnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of revenue to be recognized for future performance obligations satisfied for which consideration from customer has been received or is due in the next twelve months following the latest fiscal year.

+ References

No definition available.

+ Details

Name:	tnc_RevenuefromContractwithCustomerFuturePerformanceObligationsSatisfiedWithinNextTwelveMonths
Namespace Prefix:	tnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Standard Prepaid Maintenance Contract Time Period

+ References

No definition available.

+ Details

Name:	tnc_StandardPrepaidMaintenanceContractTimePeriod
Namespace Prefix:	tnc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References

No definition available.

+ Details

Name:	us-gaap_DeferredRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of deferred revenue recognized for transactions arising during the current reporting period. Deferred revenue is a liability as of the balance sheet date related to a revenue producing activity for which revenue has not yet been recognized. Generally, an Entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References

No definition available.

+ Details

Name:	us-gaap_DeferredRevenueAdditions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6935-107765

+ Details

Name:	us-gaap_DeferredRevenueCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References

+ Details

Name:	us-gaap_DeferredRevenueNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of revenue recognized that was previously reported as deferred or unearned revenue.

+ References

No definition available.

+ Details

Name:	us-gaap_DeferredRevenueRevenueRecognized1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DisaggregationOfRevenueLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

Name:	us-gaap_MovementInDeferredRevenueRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_RevenuePerformanceObligationSatisfiedOverTimeAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_ContractWithCustomerDurationAxis=us-gaap_ShortTermContractWithCustomerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ContractWithCustomerDurationAxis=us-gaap_LongTermContractWithCustomerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Revenue from Contracts with Customers (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Deferred Revenue, Current		$ 5,021	$ 5,815
Deferred Revenue, Noncurrent		3,504	2,483
Movement in Deferred Revenue [Roll Forward]
Beginning balance	$ 7,787
Increase in deferred revenue representing our obligation to satisfy future performance obligations	14,650
Decrease in deferred revenue for amounts recognized in Net Sales for satisfied performance obligations	(13,755)
Foreign currency fluctuations	(157)
Ending balance	8,525
Revenue, Performance Obligation Satisfied over Time [Abstract]
2019		5,021
2020		1,865
2021		1,044
2022		442
2023		153
Thereafter		0
Total	$ 7,787	$ 8,525	$ 7,787
Prepaid Maintenance Contract Duration, Minimum
Disaggregation of Revenue [Line Items]
Standard Prepaid Maintenance Contract Time Period	12 months
Prepaid Maintenance Contract Duration, Maximum
Disaggregation of Revenue [Line Items]
Standard Prepaid Maintenance Contract Time Period	60 months