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Income taxes Income tax disclosure (Details) (USD $)
 12 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Components of deferred income tax assets [Line Items]    
Deferred Tax Liability Not Recognized, Determination of Deferred Tax Liability is Not Practicable, Undistributed Earnings of Foreign Subsidiaries Determination of the amount of unrecognized deferred income tax liabilities on these earnings is not practicable because such liability, if any, is dependent on circumstances existing if and when remittance occurs.  
Repatriation $ 847,000us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings $ 0us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings
Components of deferred income tax assets    
U.S. Federal NOL carryforward 3,156,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic 2,298,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic
Non-qualified deferred compensation 2,363,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation 2,358,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation
Research tax credit 2,032,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch 1,965,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
Foreign NOL carryforward 483,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign 1,004,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign
Foreign tax credit 2,088,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign 1,294,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign
Valuation Allowance, Methodologies and Assumptions The Company continues to have a valuation allowance on its domestic DTAs since domestic losses continue to being generated.  
Stock compensation 1,033,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 1,162,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Other accruals not yet deducted 901,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 581,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
State NOL carryforward 1,291,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal 1,173,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
Accrued commissions and incentives 584,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits 814,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Accrued pension 735,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions 182,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions
Inventory valuation allowance 430,000us-gaap_DeferredTaxAssetsInventory 413,000us-gaap_DeferredTaxAssetsInventory
Other 561,000us-gaap_DeferredTaxAssetsOther 217,000us-gaap_DeferredTaxAssetsOther
Inventory uniform capitalization 94,000mfri_InventoryUniformCapitalization 102,000mfri_InventoryUniformCapitalization
Deferred tax assets, gross 15,751,000us-gaap_DeferredTaxAssetsGross 13,563,000us-gaap_DeferredTaxAssetsGross
Valuation allowance (14,201,000)us-gaap_DeferredTaxAssetsValuationAllowance (11,591,000)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred tax assets, net of valuation allowances 1,550,000us-gaap_DeferredTaxAssetsNet 1,972,000us-gaap_DeferredTaxAssetsNet
Components of the deferred income tax liability    
Depreciation 851,000us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 963,000us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Deferred Tax Liabilities, Undistributed Foreign Earnings 863,000us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings 0us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings
Prepaid 310,000us-gaap_DeferredTaxLiabilitiesOther 231,000us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities 2,024,000us-gaap_DeferredTaxLiabilities 1,194,000us-gaap_DeferredTaxLiabilities
Deferred income tax, net (474,000)us-gaap_DeferredTaxAssetsLiabilitiesNet 778,000us-gaap_DeferredTaxAssetsLiabilitiesNet
Balance sheet classification    
Deferred tax assets - long-term 0us-gaap_DeferredTaxAssetsNetNoncurrent 1,667,000us-gaap_DeferredTaxAssetsNetNoncurrent
Deferred long-term liability 309,000us-gaap_DeferredTaxLiabilitiesNoncurrent 0us-gaap_DeferredTaxLiabilitiesNoncurrent
Deferred tax liabilities - current 165,000us-gaap_DeferredTaxLiabilitiesCurrent 889,000us-gaap_DeferredTaxLiabilitiesCurrent
Suspended excess tax (benefit) expense from stock options exercised 300,000us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease  
Federal operating loss carryforward, gross 11,800,000us-gaap_OperatingLossCarryforwards  
Federal operating loss carryforward expires Jan. 31, 2030  
Operating Loss Carryforwards, Expiration Dates expire at various times from 2015 to 2031  
State NOL, subject to expiration 3,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration  
Tax Credit Carryforward, Expiration Date Jan. 31, 2022  
Undistributed earnings of foreign subsidiaries 55,300,000us-gaap_UndistributedEarningsOfForeignSubsidiaries  
Income Tax Examination, Description No changes were made to the reported tax  
Open Tax Year 2011  
Open tax years up to the amount of research tax credit generated January 31, 2002 through January 31, 2009  
Foreign Tax Authority [Member]    
Components of deferred income tax assets    
Foreign tax credit 500,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign
/ us-gaap_StatementGeographicalAxis
= us-gaap_ForeignCountryMember		  
Middle East [Member]    
Components of deferred income tax assets    
Foreign tax credit 400,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign
/ us-gaap_StatementGeographicalAxis
= country_SA		  
Foreign Tax Authority [Member]    
Balance sheet classification    
Change in valuation allowance 15,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= us-gaap_ForeignCountryMember		 (1,209,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= us-gaap_ForeignCountryMember
India    
Components of deferred income tax assets [Line Items]    
Foreign Earnings Repatriated 4,200,000us-gaap_ForeignEarningsRepatriated
/ us-gaap_IncomeTaxAuthorityAxis
= country_IN		  
Repatriation 800,000us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings
/ us-gaap_IncomeTaxAuthorityAxis
= country_IN		  
Denmark    
Components of deferred income tax assets [Line Items]    
Foreign Earnings Repatriated $ 800,000us-gaap_ForeignEarningsRepatriated
/ us-gaap_IncomeTaxAuthorityAxis
= country_DK