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Organization and Significant Accounting Policies - Goodwill (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Goodwill [Roll Forward] |  |  |
Beginning Carrying Amount | $ 21,051 us-gaap_Goodwill | $ 21,051 us-gaap_Goodwill |
Acquired Goodwill | 4,465 us-gaap_GoodwillAcquiredDuringPeriod | 0 us-gaap_GoodwillAcquiredDuringPeriod |
Impairment Charge | (23,400)us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss
Ending Carrying Amount | 2,116 us-gaap_Goodwill | 21,051 us-gaap_Goodwill | 21,051 us-gaap_Goodwill
FUEL CHEM Segment |  |  |
Goodwill [Roll Forward] |  |  |
Beginning Carrying Amount | 2,116 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember | 2,116 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember |
Acquired Goodwill | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember |
Impairment Charge | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember |
Ending Carrying Amount | 2,116 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember | 2,116 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember |
APC Technology Segment |  |  |
Goodwill [Roll Forward] |  |  |
Beginning Carrying Amount | 18,935 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ftek_APCTechnologySegmentMember | 18,935 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ftek_APCTechnologySegmentMember |
Acquired Goodwill | 4,465 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = ftek_APCTechnologySegmentMember | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = ftek_APCTechnologySegmentMember |
Impairment Charge | (23,400)us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = ftek_APCTechnologySegmentMember | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = ftek_APCTechnologySegmentMember |
Ending Carrying Amount | $ 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ftek_APCTechnologySegmentMember | $ 18,935 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ftek_APCTechnologySegmentMember |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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