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STATEMENTS OF CASH FLOWS (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Operating Activities:    
Net income $ 211,000us-gaap_NetIncomeLoss $ 1,379,000us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 1,177,000us-gaap_DepreciationDepletionAndAmortization 1,058,000us-gaap_DepreciationDepletionAndAmortization
Change in allowance for doubtful accounts 72,000us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease  
Deferred income tax expense 57,000us-gaap_DeferredIncomeTaxExpenseBenefit 178,000us-gaap_DeferredIncomeTaxExpenseBenefit
Stock-based compensation 403,000us-gaap_ShareBasedCompensation 533,000us-gaap_ShareBasedCompensation
Gain on sale of property and equipment (3,000)us-gaap_GainLossOnSaleOfPropertyPlantEquipment (12,000)us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Excess tax benefit from stock options (20,000)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities  
Changes in operating assets and liabilities:    
Accounts receivable (3,277,000)us-gaap_IncreaseDecreaseInAccountsReceivable (503,000)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories (216,000)us-gaap_IncreaseDecreaseInInventories 3,000us-gaap_IncreaseDecreaseInInventories
Income tax receivable (276,000)us-gaap_IncreaseDecreaseInIncomeTaxesReceivable 789,000us-gaap_IncreaseDecreaseInIncomeTaxesReceivable
Prepaid expenses and other (424,000)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 234,000us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable 452,000us-gaap_IncreaseDecreaseInAccountsPayable 514,000us-gaap_IncreaseDecreaseInAccountsPayable
Accrued liabilities 177,000us-gaap_IncreaseDecreaseInAccruedLiabilities (103,000)us-gaap_IncreaseDecreaseInAccruedLiabilities
Income tax payable 80,000us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable 22,000us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Accrued income taxes 28,000us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities 28,000us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities
Deferred revenue (89,000)us-gaap_IncreaseDecreaseInDeferredRevenue (141,000)us-gaap_IncreaseDecreaseInDeferredRevenue
Net cash provided by (used in) operating activities (1,648,000)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 3,979,000us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Investing Activities:    
Purchases of property and equipment (427,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (265,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Acquisition of selling rights and other (542,000)isig_PaymentsToAcquireSalesContractRightsAndOther  
Purchases of investments (12,474,000)us-gaap_PaymentsToAcquireInvestments  
Proceeds from sale of investments 2,765,000us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments  
Proceeds received from sale of property and equipment 14,000us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 15,000us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Net cash used in investing activities (10,664,000)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (250,000)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Financing Activities:    
Proceeds from issuance of common stock, net 216,000us-gaap_ProceedsFromIssuanceOfCommonStock 91,000us-gaap_ProceedsFromIssuanceOfCommonStock
Excess tax benefit from stock options 20,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities  
Repurchase of common stock, net (2,450,000)us-gaap_PaymentsForRepurchaseOfCommonStock (2,328,000)us-gaap_PaymentsForRepurchaseOfCommonStock
Net cash used in financing activities (2,214,000)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (2,237,000)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Increase (decrease) in cash and cash equivalents (14,526,000)us-gaap_NetCashProvidedByUsedInContinuingOperations 1,492,000us-gaap_NetCashProvidedByUsedInContinuingOperations
Cash and cash equivalents at beginning of year 21,763,000us-gaap_CashAndCashEquivalentsAtCarryingValue 20,271,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of year 7,237,000us-gaap_CashAndCashEquivalentsAtCarryingValue 21,763,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosures for cash flow information:    
Cash paid during the year for income taxes $ 482,000us-gaap_IncomeTaxesPaid $ 842,000us-gaap_IncomeTaxesPaid