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Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Jan. 31, 2013
Revenues:      
Equipment leasing $ 48,312us-gaap_OperatingLeasesIncomeStatementLeaseRevenue $ 46,756us-gaap_OperatingLeasesIncomeStatementLeaseRevenue $ 54,592us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
Lease pool equipment sales 3,158mind_LeasePoolEquipmentSales 6,851mind_LeasePoolEquipmentSales 11,412mind_LeasePoolEquipmentSales
Seamap equipment sales 23,316mind_SubsidiaryEquipmentSales 25,086mind_SubsidiaryEquipmentSales 31,169mind_SubsidiaryEquipmentSales
Other equipment sales 8,360us-gaap_OtherSalesRevenueNet 13,415us-gaap_OtherSalesRevenueNet 7,512us-gaap_OtherSalesRevenueNet
Total revenues 83,146us-gaap_Revenues 92,108us-gaap_Revenues 104,685us-gaap_Revenues
Cost of sales:      
Direct costs-equipment leasing 6,689us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment 5,517us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment 7,963us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment
Direct costs-lease pool depreciation 34,399us-gaap_CostOfGoodsAndServicesSoldDepreciation 29,412us-gaap_CostOfGoodsAndServicesSoldDepreciation 33,405us-gaap_CostOfGoodsAndServicesSoldDepreciation
Cost of lease pool equipment sales 1,097mind_CostOfLeasePoolEquipmentSales 2,295mind_CostOfLeasePoolEquipmentSales 6,043mind_CostOfLeasePoolEquipmentSales
Cost of Seamap and other equipment sales 17,707mind_CostOfSubsidiaryAndOtherEquipmentSales 22,869mind_CostOfSubsidiaryAndOtherEquipmentSales 19,861mind_CostOfSubsidiaryAndOtherEquipmentSales
Total cost of sales 59,892us-gaap_CostOfGoodsAndServicesSold 60,093us-gaap_CostOfGoodsAndServicesSold 67,272us-gaap_CostOfGoodsAndServicesSold
Gross profit 23,254us-gaap_GrossProfit 32,015us-gaap_GrossProfit 37,413us-gaap_GrossProfit
Operating expenses:      
General and administrative 24,958us-gaap_GeneralAndAdministrativeExpense 23,669us-gaap_GeneralAndAdministrativeExpense 22,539us-gaap_GeneralAndAdministrativeExpense
Provision for (recovery of) doubtful accounts 2,850us-gaap_ProvisionForDoubtfulAccounts 1,048us-gaap_ProvisionForDoubtfulAccounts (428)us-gaap_ProvisionForDoubtfulAccounts
Depreciation and amortization 2,191us-gaap_DepreciationDepletionAndAmortization 1,493us-gaap_DepreciationDepletionAndAmortization 1,400us-gaap_DepreciationDepletionAndAmortization
Total operating expenses 29,999us-gaap_OperatingExpenses 26,210us-gaap_OperatingExpenses 23,511us-gaap_OperatingExpenses
Operating (loss) income (6,745)us-gaap_OperatingIncomeLoss 5,805us-gaap_OperatingIncomeLoss 13,902us-gaap_OperatingIncomeLoss
Other income (expense):      
Interest income 229us-gaap_InvestmentIncomeInterest 304us-gaap_InvestmentIncomeInterest 544us-gaap_InvestmentIncomeInterest
Interest expense (902)us-gaap_InterestExpense (314)us-gaap_InterestExpense (533)us-gaap_InterestExpense
Other, net (2,768)us-gaap_OtherNonoperatingIncomeExpense 231us-gaap_OtherNonoperatingIncomeExpense (389)us-gaap_OtherNonoperatingIncomeExpense
Total other income (expense) (3,441)us-gaap_NonoperatingIncomeExpense 221us-gaap_NonoperatingIncomeExpense (378)us-gaap_NonoperatingIncomeExpense
(Loss) income before income taxes (10,186)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 6,026us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 13,524us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Benefit from (provision for) income taxes 994us-gaap_IncomeTaxExpenseBenefit (1,258)us-gaap_IncomeTaxExpenseBenefit 3,527us-gaap_IncomeTaxExpenseBenefit
Net (loss) income $ (9,192)us-gaap_NetIncomeLoss $ 4,768us-gaap_NetIncomeLoss $ 17,051us-gaap_NetIncomeLoss
Net (loss) income per common share:      
Basic $ (0.74)us-gaap_EarningsPerShareBasic $ 0.37us-gaap_EarningsPerShareBasic $ 1.34us-gaap_EarningsPerShareBasic
Diluted $ (0.74)us-gaap_EarningsPerShareDiluted $ 0.36us-gaap_EarningsPerShareDiluted $ 1.29us-gaap_EarningsPerShareDiluted
Shares used in computing (loss) income per common share:      
Basic 12,479us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 12,763us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 12,715us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted 12,479us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 13,177us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 13,242us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding