Aggregate number of additional common shares reserved for issuance.

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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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The lowest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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Aggregate number of common shares reserved for future issuance.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

Amount of cash inflow from issuance of shares under share-based payment arrangement. Includes, but is not limited to, option exercised.

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-Name Accounting Standards Codification
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-Paragraph 2A
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-Section 45
-Paragraph 14
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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Discount rate from fair value on offering date that participants pay for shares.

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Discount rate from fair value on purchase date that participants pay for shares.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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- Definition

Number of additional shares authorized for issuance under share-based payment arrangement.

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Number of shares authorized for issuance under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Number of options outstanding, including both vested and non-vested options.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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Note 15 - Stock-based Compensation (Details Textual) - USD ($)		1 Months Ended				12 Months Ended
	Mar. 02, 2016	Jun. 30, 2016	Jun. 30, 2012	Jun. 22, 2012	Nov. 30, 2009	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2015	Jul. 31, 2021	May 30, 2009	Mar. 30, 2009	Mar. 02, 2006
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)						155,397,800	172,093,650
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares)						114,962,150
Common Stock, Capital Shares Reserved for Future Issuance (in shares)						353,363,350
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate						0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)						$ 0.1642	$ 0.0980	$ 0.0128
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total						$ 5,425,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)						3 years 1 month 6 days
Proceeds, Issuance of Shares, Share-based Payment Arrangement, Including Option Exercised, Total						$ 1,753,000	$ 553,000	$ 116,000
Restricted Stock Units (RSUs) [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)						89,326,700
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value						$ 1,165,000	$ 1,298,000	$ 1,065,000
Purchase Plan 1999 [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award Minimum Employee Subscription Rate						1.00%
Share-Based Compensation Arrangement By Share-Based Payment Award Employee Subscription Rate Maximum						10.00%
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date						90.00%
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date						90.00%
Purchase Plan 2009 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)					10 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)					25,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares)		25,000,000	15,000,000
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)						7,817,850
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)						$ 0.0382	$ 0.0148	$ 0.0060
Share Option Plan 2005 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)				8 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)													100,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares)				50,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)											175,000,000		100,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)				4 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)						52,116,400
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares)						52,116,400
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value						$ 3,292,100	$ 774,100	$ 800
The 2015 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)	125,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)						103,281,400
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares)						62,845,750
Common Stock, Capital Shares Reserved for Future Issuance (in shares)	100,000,000
Common Stock, Additional Capital Shares Reserved for Issuance (in shares)										100,000,000
Share Incentive Plan 2005 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)											75,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares)				62,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)											75,000,000	125,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)									4 years