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Income Taxes (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Income Taxes      
Maximum ownership as a percentage of the voting power or value of the securities of each issuer other than REIT or "TRS" 10.00%fsp_MaximumOwnershipPercentageInEachIssuerOtherThanREITOrTRSToMaintainREITStatus    
Maximum ownership of securities in all TRS (as a percent) 25.00%fsp_MaximumOwnershipInAllTaxableREITSubsidiariesAsPercentageOfAssetsOfEntityToMaintainREITStatus    
Maximum ownership of securities in all TRS when considered together with other non-real estate assets (as a percent) 25.00%fsp_MaximumOwnershipInAllTaxableREITSubsidiariesAsPercentageOfAssetsOfEntityToMaintainREITStatusIncludingOtherNonRealEstateAssets    
Period of statute of limitations applicable to the entity's income tax returns 3 years    
Net operating losses      
NOLs expiration period 20 years    
Gross amount of NOLs available to company $ 13,041,000us-gaap_OperatingLossCarryforwards   $ 13,041,000us-gaap_OperatingLossCarryforwards
Income Tax Expense      
Revised Texas Franchise tax rate (as a percent) 0.70%fsp_EffectiveRevisedTexasFranchiseTaxRate    
Revised Texas franchise tax 159,000fsp_IncomeTaxReconciliationRevisedTexasFranchiseTax 127,000fsp_IncomeTaxReconciliationRevisedTexasFranchiseTax  
Other Taxes 2,000us-gaap_IncomeTaxReconciliationOtherReconcilingItems 10,000us-gaap_IncomeTaxReconciliationOtherReconcilingItems  
Income tax expense 161,000us-gaap_IncomeTaxExpenseBenefit 137,000us-gaap_IncomeTaxExpenseBenefit  
Deferred income taxes $ 0us-gaap_DeferredIncomeTaxExpenseBenefit