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Business Acquisitions Purchase Price (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Apr. 30, 2014
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Business Acquisition [Line Items] |  |  |  |
Identifiable intangible assets | $ 5,158 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill |  |  |
Goodwill | 2,116 us-gaap_Goodwill | 21,051 us-gaap_Goodwill | 21,051 us-gaap_Goodwill |
PECO and FGC Acquisitions [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Current assets |  |  |  | 2,391 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets / us-gaap_BusinessAcquisitionAxis = ftek_PECOandFGCAcquisitionsMember
Property, plant and equipment |  |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = ftek_PECOandFGCAcquisitionsMember
Identifiable intangible assets |  |  |  | 5,158 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = ftek_PECOandFGCAcquisitionsMember
Current and long-term liabilities assumed |  |  |  | (3,935)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = ftek_PECOandFGCAcquisitionsMember
Total identifiable net assets acquired |  |  |  | 3,614 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = ftek_PECOandFGCAcquisitionsMember
Goodwill |  |  |  | 4,465 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ftek_PECOandFGCAcquisitionsMember
Total assets acquired |  |  |  | 8,079 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = ftek_PECOandFGCAcquisitionsMember
Scenario, Previously Reported [Member] | PECO and FGC Acquisitions [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Current assets |  |  |  | 2,365 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets / us-gaap_BusinessAcquisitionAxis = ftek_PECOandFGCAcquisitionsMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Property, plant and equipment |  |  |  | 281 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = ftek_PECOandFGCAcquisitionsMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Identifiable intangible assets |  |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = ftek_PECOandFGCAcquisitionsMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Current and long-term liabilities assumed |  |  |  | (2,035)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = ftek_PECOandFGCAcquisitionsMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Total identifiable net assets acquired |  |  |  | 611 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = ftek_PECOandFGCAcquisitionsMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Goodwill |  |  |  | 7,468 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ftek_PECOandFGCAcquisitionsMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Total assets acquired |  |  |  | 8,079 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = ftek_PECOandFGCAcquisitionsMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Scenario, Adjustment [Member] | PECO and FGC Acquisitions [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Current assets |  |  |  | 26 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets / us-gaap_BusinessAcquisitionAxis = ftek_PECOandFGCAcquisitionsMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember
Property, plant and equipment |  |  |  | (281)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = ftek_PECOandFGCAcquisitionsMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember
Identifiable intangible assets |  |  |  | 5,158 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = ftek_PECOandFGCAcquisitionsMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember
Current and long-term liabilities assumed |  |  |  | (1,900)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = ftek_PECOandFGCAcquisitionsMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember
Total identifiable net assets acquired |  |  |  | 3,003 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = ftek_PECOandFGCAcquisitionsMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember
Goodwill |  |  |  | (3,003)us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ftek_PECOandFGCAcquisitionsMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember
Total assets acquired |  |  |  | $ 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = ftek_PECOandFGCAcquisitionsMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember

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- Definition Amount of assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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