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Acquisitions (Details Textual) (USD $)
1 Months Ended 12 Months Ended
Jul. 31, 2011
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Business Acquisition [Line Items]        
Payments to Acquire Businesses, Gross $ 4,800,000us-gaap_PaymentsToAcquireBusinessesGross      
Business Acquisition Purchase Price Allocation one Goodwill Amount   4,000,000fdef_BusinessAcquisitionPurchasePriceAllocationOneGoodwillAmount    
Business Acquisition Purchase Price Allocation one Intangible Assets Other Than Goodwill   689,000fdef_BusinessAcquisitionPurchasePriceAllocationOneIntangibleAssetsOtherThanGoodwill    
Business Acquisition Purchase Price Allocation Customer Related Intangible Assets Other Than Goodwill   482,000fdef_BusinessAcquisitionPurchasePriceAllocationCustomerRelatedIntangibleAssetsOtherThanGoodwill    
Business Acquisition Purchase Price Allocation Non Compete Intangible Assets Other Than Goodwill   207,000fdef_BusinessAcquisitionPurchasePriceAllocationNonCompeteIntangibleAssetsOtherThanGoodwill    
Business Combination, Liabilities Arising from Contingencies, Amount Recognized, Other than at Fair Value   822,800us-gaap_BusinessCombinationLiabilitiesArisingFromContingenciesAmountRecognizedOtherThanAtFairValue    
Business Combination Liabilities Arising From Contingencies Amount Paid   157,000fdef_BusinessCombinationLiabilitiesArisingFromContingenciesAmountPaid 596,000fdef_BusinessCombinationLiabilitiesArisingFromContingenciesAmountPaid 70,000fdef_BusinessCombinationLiabilitiesArisingFromContingenciesAmountPaid
Subsequent Event [Member]        
Business Acquisition [Line Items]        
Business Acquisition Accrued Liabilities Cash Payout   $ 20,000fdef_BusinessAcquisitionAccruedLiabilitiesCashPayout
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember