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Note 6 - Employee Benefit and Savings Plan (Details) - Contributions to 401(k) Plan (USD $) | 0 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Contributions to 401(k) Plan [Abstract] |  |  |  |  |  |
Maximum Matching Contribution per Participant* | $ 10,400 us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount | [1] | $ 10,200 us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount | [1] | $ 7,500 us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount | [1]
Total Matching Contribution | $ 286,224 us-gaap_DefinedContributionPlanCostRecognized |  | $ 301,434 us-gaap_DefinedContributionPlanCostRecognized |  | $ 308,567 us-gaap_DefinedContributionPlanCostRecognized |
[1] | Due to the annual limit on eligible earnings imposed by the Internal Revenue Code

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- Details
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Namespace Prefix: | tlf_
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Period Type: | duration

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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Maximum amount the employee may contribute to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration