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Note 11 - Stockholders' Equity - Unrecognized Compensation Expense for Non-vested Restricted Stock Awards (Details) - Restricted Stock [Member] | Dec. 31, 2017 USD ($)
--- | ---
2017 | $ 100,127
2018 | 58,126
2019 | 14,853
2020 | $ 1,208

X
- Definition Unrecognized cost of unvested share-based compensation awards due during the remainder of the fiscal year. + References No definition available. + Details
Name: | tlf_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedRemainderOfFiscalYear
Namespace Prefix: | tlf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Unrecognized cost of unvested share-based compensation awards due in three years. + References No definition available. + Details
Name: | tlf_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedDueInThreeYears
Namespace Prefix: | tlf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Unrecognized cost of unvested share-based compensation awards. + References No definition available. + Details
Name: | tlf_EmployeeServiceSharebasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedDueInFourYears
Namespace Prefix: | tlf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Unrecognized cost of unvested share-based compensation awards due in two years. + References No definition available. + Details
Name: | tlf_EmployeeServiceSharebasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedDueInTwoYears
Namespace Prefix: | tlf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |