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Business Acquisitions Sales and Earnings (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | $ 79,017 us-gaap_Revenues | $ 109,338 us-gaap_Revenues | $ 97,644 us-gaap_Revenues
Net income / (loss) |  |  |  |  |  |  |  |  | (25,803)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 7,865 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 5,078 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Basic (in dollars per share) | $ (0.75)us-gaap_EarningsPerShareBasic | $ 0.02 us-gaap_EarningsPerShareBasic | $ 0.05 us-gaap_EarningsPerShareBasic | $ (0.03)us-gaap_EarningsPerShareBasic | $ (0.05)us-gaap_EarningsPerShareBasic | $ 0.16 us-gaap_EarningsPerShareBasic | $ 0.06 us-gaap_EarningsPerShareBasic | $ 0.00 us-gaap_EarningsPerShareBasic | $ (0.78)us-gaap_EarningsPerShareBasic | $ 0.23 us-gaap_EarningsPerShareBasic | $ 0.12 us-gaap_EarningsPerShareBasic
Diluted (in dollars per share) | $ (0.75)us-gaap_EarningsPerShareDiluted | $ 0.02 us-gaap_EarningsPerShareDiluted | $ 0.05 us-gaap_EarningsPerShareDiluted | $ (0.03)us-gaap_EarningsPerShareDiluted | $ (0.05)us-gaap_EarningsPerShareDiluted | $ 0.15 us-gaap_EarningsPerShareDiluted | $ 0.05 us-gaap_EarningsPerShareDiluted | $ 0.00 us-gaap_EarningsPerShareDiluted | $ (0.01)us-gaap_EarningsPerShareDiluted | $ 0.23 us-gaap_EarningsPerShareDiluted | $ 0.12 us-gaap_EarningsPerShareDiluted
PECO and FGC Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | 4,193 us-gaap_Revenues / us-gaap_BusinessAcquisitionAxis = ftek_PECOandFGCAcquisitionsMember |  |
Net income / (loss) |  |  |  |  |  |  |  |  | $ (120)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_BusinessAcquisitionAxis = ftek_PECOandFGCAcquisitionsMember |  |
Basic (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.00 us-gaap_EarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = ftek_PECOandFGCAcquisitionsMember |  |
Diluted (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.00 us-gaap_EarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = ftek_PECOandFGCAcquisitionsMember |  |

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