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Disclosures, Individual Name Payments for Repurchase of Common Stock since Inception Payments for Repurchase of Common Stock since Inception Payments for Repurchase of Common Stock since Inception Common stock authorized to repurchase Share Repurchase Program, Authorized, Amount Purchases of marketable securities Payments to Acquire Investments Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Document Quarterly Report Document Quarterly Report Assets, Noncurrent [Abstract] Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Treasury Stock Shares Repurchased Treasury Stock Shares Repurchased Treasury Stock Shares Repurchased Preferred stock, authorized shares Preferred Stock, Shares Authorized Common Stock Including Additional Paid in Capital [Member] Common Stock Including Additional Paid in Capital [Member] Debt Disclosure Debt Disclosure [Text Block] Interest Payable Interest Payable Preferred stock-par value $.001 per share Preferred Stock, Value, Issued Scenario [Axis] Scenario [Axis] Adjustment to Compensation: Adjustment to Compensation [Axis] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Class of Stock [Domain] Class of Stock [Domain] Equity Component [Domain] Equity Component [Domain] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Aggregate Erroneous Compensation Amount Aggregate Erroneous 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operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Net Income Net income Net Income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Current assets: Assets, Current [Abstract] Income Statement [Abstract] Income Statement [Abstract] Stockholders' deficit: Equity, Attributable to Parent [Abstract] Document Transition Report Document Transition Report Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Financial Instruments, Owned, at Fair Value, by Type, Alternative [Abstract] Income tax expense Income tax expense from continuing operations Income Tax Expense (Benefit) Deferred Income Tax Assets, Net Deferred Income Tax Assets, Net Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Award Timing Method Award Timing Method [Text Block] Cash, Cash Equivalents, Restricted 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