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Note 7 - Intangible and Other Assets, Net - Schedule of Intangible Assets (Details) The 2009 Stock Option Plan [Member] Represents the The 2009 Stock Option Plan. Note 7 - Intangible and Other Assets, Net - Schedule of Other Assets (Details) CASH FLOWS FROM OPERATING ACTIVITIES Note 8 - Other Current Liabilities - Schedule of Other Current Liabilities (Details) The 2015 Stock Option Plan [Member] Represents the The 2015 Stock Option Plan. Note 10 - Lease - Schedule of Lease Maturities (Details) CASH FLOWS FROM INVESTING ACTIVITIES Note 11 - Segment Reporting - Schedule of Segment Reporting Information (Details) us-gaap_NetCashProvidedByUsedInOperatingActivities Net cash flows (used in) provided by operating activities Notes To Financial Statements us-gaap_NetCashProvidedByUsedInInvestingActivities Net cash flows used in investing activities Notes To Financial Statements [Abstract] The 2007 Stock Option Plan [Member] Represents the 2007 stock option plan. crvw_ContractWithCustomerLiabilityRevenueRecognizedExcludingOpeningBalance Contract with Customer, Liability, Revenue Recognized, Excluding Opening Balance Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due, excluding opening balance. The 2016 Stock Option Plan [Member] Represents the The 2016 Stock Option Plan. The 2020 Stock Option Plan [Member] Represents the The 2020 Stock Option Plan. 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Equipment Components [Member] Relating to equipment components. Paid time off Amount of expense for paid time off. Other assets, net Granted, remaining contractual life (Year) Weighted average remaining contractual term for option awards granted during period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Test Equipment [Member] Relating to test equipment. us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue Total minimum lease payments Network Equipment [Member] Relating to network equipment. Installation expenses Amount of expenses for installation. Deferred revenue us-gaap_IncreaseDecreaseInDeferredRevenue Warrant [Member] Warrants, remaining contractual life (Year) Represents the weighted average remaining contractual life of warrants or rights. us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent Operating Lease, Weighted Average Discount Rate, Percent Document Type Portable Units [Member] Represents portable units inventory. us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrice Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Exercise Price (in dollars per share) Schedule of Other Current Liabilities [Table Text Block] The tabular disclosure of other current liabilities. 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Net loss per share (in dollars per share) Deferred Installation Costs [Member] Relating to deferred installation costs. us-gaap_NotesPayable Notes Payable Security Deposits [Member] Relating to security deposits. Prepaid License Fee [Member] Relating to prepaid license fees. Other assets, gross Represents the amount of noncurrent assets classified as other before amortization. Notes payable Common stock - par value $0.001; 800,000,000 shares authorized; 583,880,748 issued and outstanding Other assets, amortization Represents the amount of accumulated amortization on noncurrent assets classified as other. Schedule of Inventory, Current [Table Text Block] Earnings Per Share, Policy [Policy Text Block] us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 Warrants, exercise price (in dollars per share) Warrants, exercise price (in dollars per share) PDL Credit Agreement [Member] Relating to the PDL Credit Agreement. 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