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Summary of Significant Accounting Policies - Details of Computation of Earnings per Common Share, Basic and Diluted (Detail) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Numerator for basic per share calculation:                      
Income from continuing operations for basic calculation $ 1,524,000us-gaap_IncomeLossFromContinuingOperations $ 1,130,000us-gaap_IncomeLossFromContinuingOperations $ 915,000us-gaap_IncomeLossFromContinuingOperations $ 1,047,000us-gaap_IncomeLossFromContinuingOperations $ 16,304,000us-gaap_IncomeLossFromContinuingOperations $ 705,000us-gaap_IncomeLossFromContinuingOperations $ 522,000us-gaap_IncomeLossFromContinuingOperations $ 402,000us-gaap_IncomeLossFromContinuingOperations $ 4,616,385us-gaap_IncomeLossFromContinuingOperations $ 17,933,431us-gaap_IncomeLossFromContinuingOperations $ 8,013,330us-gaap_IncomeLossFromContinuingOperations
(Loss) from discontinued operations, net of income tax (benefit)                 (569,263)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (336,489)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (12,296,912)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Net income (loss) for basic calculation 1,476,000us-gaap_NetIncomeLoss 1,080,000us-gaap_NetIncomeLoss 822,000us-gaap_NetIncomeLoss 669,000us-gaap_NetIncomeLoss 16,214,000us-gaap_NetIncomeLoss 649,000us-gaap_NetIncomeLoss 484,000us-gaap_NetIncomeLoss 250,000us-gaap_NetIncomeLoss 4,047,122us-gaap_NetIncomeLoss 17,596,942us-gaap_NetIncomeLoss (4,283,582)us-gaap_NetIncomeLoss
Numerator for diluted per share calculation:                      
Income from continuing operations 1,524,000us-gaap_IncomeLossFromContinuingOperations 1,130,000us-gaap_IncomeLossFromContinuingOperations 915,000us-gaap_IncomeLossFromContinuingOperations 1,047,000us-gaap_IncomeLossFromContinuingOperations 16,304,000us-gaap_IncomeLossFromContinuingOperations 705,000us-gaap_IncomeLossFromContinuingOperations 522,000us-gaap_IncomeLossFromContinuingOperations 402,000us-gaap_IncomeLossFromContinuingOperations 4,616,385us-gaap_IncomeLossFromContinuingOperations 17,933,431us-gaap_IncomeLossFromContinuingOperations 8,013,330us-gaap_IncomeLossFromContinuingOperations
Adjustments to income from continuing operations for the statement of operations impact of dilutive securities                 (136,563)us-gaap_DilutiveSecurities 0us-gaap_DilutiveSecurities 0us-gaap_DilutiveSecurities
Income from continuing operations for dilution calculation                 4,479,822reis_IncomeFromContinuingOperationsForDilutionCalculation 17,933,431reis_IncomeFromContinuingOperationsForDilutionCalculation 8,013,330reis_IncomeFromContinuingOperationsForDilutionCalculation
(Loss) from discontinued operations, net of income tax (benefit)                 (569,263)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (336,489)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (12,296,912)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Net income (loss) for dilution calculation                 $ 3,910,559us-gaap_NetIncomeLossAttributableToParentDiluted $ 17,596,942us-gaap_NetIncomeLossAttributableToParentDiluted $ (4,283,582)us-gaap_NetIncomeLossAttributableToParentDiluted
Denominator:                      
Weighted average common shares - basic 11,145,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 11,119,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 11,102,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 10,979,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 10,909,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 10,908,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 10,892,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 10,828,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 11,086,690us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 10,884,533us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 10,685,333us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities:                      
RSUs                 169,813us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 242,396us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 305,033us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Stock options                 336,576reis_IncrementalCommonSharesAttributableToStockOptions 269,630reis_IncrementalCommonSharesAttributableToStockOptions 43,716reis_IncrementalCommonSharesAttributableToStockOptions
Weighted average common shares - diluted 11,688,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 11,653,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 11,531,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 11,463,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 11,464,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 11,445,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 11,398,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 11,348,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 11,593,079us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 11,396,559us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 11,034,082us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Per common share amounts - basic:                      
Income from continuing operations $ 0.14us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.10us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.08us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.10us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 1.49us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.06us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.05us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.04us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.42us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 1.65us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.75us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
(Loss) from discontinued operations                 $ (0.05)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ (0.03)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ (1.15)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Net income (loss) $ 0.13us-gaap_EarningsPerShareBasic $ 0.10us-gaap_EarningsPerShareBasic $ 0.07us-gaap_EarningsPerShareBasic $ 0.06us-gaap_EarningsPerShareBasic $ 1.49us-gaap_EarningsPerShareBasic $ 0.06us-gaap_EarningsPerShareBasic $ 0.04us-gaap_EarningsPerShareBasic $ 0.02us-gaap_EarningsPerShareBasic $ 0.37us-gaap_EarningsPerShareBasic $ 1.62us-gaap_EarningsPerShareBasic $ (0.40)us-gaap_EarningsPerShareBasic
Per common share amounts - diluted:                      
Income from continuing operations $ 0.12us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.10us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.08us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.09us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 1.42us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.05us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.05us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.04us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.39us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 1.57us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.73us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
(Loss) from discontinued operations                 $ (0.05)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ (0.03)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ (1.12)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Net income (loss) $ 0.11us-gaap_EarningsPerShareDiluted $ 0.09us-gaap_EarningsPerShareDiluted $ 0.07us-gaap_EarningsPerShareDiluted $ 0.06us-gaap_EarningsPerShareDiluted $ 1.41us-gaap_EarningsPerShareDiluted $ 0.05us-gaap_EarningsPerShareDiluted $ 0.04us-gaap_EarningsPerShareDiluted $ 0.02us-gaap_EarningsPerShareDiluted $ 0.34us-gaap_EarningsPerShareDiluted $ 1.54us-gaap_EarningsPerShareDiluted $ (0.39)us-gaap_EarningsPerShareDiluted