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

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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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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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Gross number of share options (or share units) granted during the period.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Per share or per unit amount of equity securities issued.

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Note 5 - Share-based Compensation (Details Textual) - USD ($)				3 Months Ended
	Mar. 31, 2023	Jun. 22, 2018	Sep. 07, 2017	Mar. 31, 2024	Mar. 31, 2023
Stock Issued During Period, Value, Issued for Services				$ 83,000	$ 207,000
Share Price (in dollars per share)				$ 0.35
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)				0
Remaining Stock Option Plan Expense				$ 1,056,000
Stock Option Plan Expense, Period of Recognition (Year)				4 years
2018 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)		10 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized Per Year (in shares)		2,000,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)				52,000,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)				9,343,614
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)				1,547,938	1,320,498
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount				$ 5,025,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)				4 years
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)				$ 0.3	$ 0.2
Equity Incentive Plan 2007 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)			10 years
Non Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)					48,804
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)					$ 0.2
Share-Based Payment Arrangement, Option [Member] \| Clyra Medical Technologies [Member]
Share-Based Payment Arrangement, Expense				$ 59,000	$ 61,000
Selling, General and Administrative Expenses [Member]
Share-Based Payment Arrangement, Expense				$ 488,000	$ 256,000
Officer [Member]
Stock Issued During Period, Shares, Issued for Services (in shares)	30,747			0
Stock Issued During Period, Value, Issued for Services	$ 6,000
Shares Issued, Price Per Share (in dollars per share)	$ 0.2				$ 0.2
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Minimum Cash Amount Receipt				$ 3,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Minimum Revenue Required				$ 3,000,000
Consultants [Member]
Stock Issued During Period, Shares, Issued for Services (in shares)				250,639	899,743
Stock Issued During Period, Value, Issued for Services				$ 83,000	$ 201,000
Shares Issued, Price Per Share (in dollars per share)	$ 0.2			$ 0.35	$ 0.2
Board of Directors, Employees, and Consultants [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)				1,547,938
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value				$ 418,000
Board of Directors, Employees, and Consultants [Member] \| 2018 Equity Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)				544,841
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value				$ 173,000
Board Of Directors [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)				267,746
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value				$ 85,000
Board Of Directors [Member] \| 2018 Equity Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)					347,730
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value					$ 65,000
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)					$ 0.2
Employees [Member] \| Employee Retention Program [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)				735,351	570,204
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value				$ 160,000	$ 108,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)					4 years
Employees [Member] \| Employee Retention Program [Member] \| Maximum [Member]
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)					$ 0.2
Officer, Board of Directors, Employees, and a Consultant [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)					1,320,498
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value					$ 248,000
Employees and Consultants [Member] \| 2018 Equity Incentive Plan [Member]
Stock Issued During Period, Value, Issued for Services					$ 19,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)					102,564
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)					$ 0.2
Chief Financial Officer [Member] \| 2018 Equity Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)					300,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value					$ 56,000
Vendors [Member] \| Non Plan [Member]
Share-Based Payment Arrangement, Expense					$ 9,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)					48,804
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)					$ 0.2