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

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Percentage of vesting of award under share-based payment arrangement.

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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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Note I - Stock Option Plans (Details Textual) - USD ($)	12 Months Ended
Note I - Stock Option Plans (Details Textual) - USD ($)	Dec. 31, 2023	Dec. 31, 2022	Jun. 28, 2023	Dec. 31, 2021
Deferred Compensation Arrangement with Individual, Shares Authorized for Issuance (in shares)	3,098,917	2,440,673		2,066,343
Share-Based Payment Arrangement, Option [Member]
Share-Based Payment Arrangement, Amount Capitalized	$ 900,000	$ 1,000,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 1,500,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	2 years 3 months 18 days
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)	0
Share-Based Payment Arrangement, Option [Member] \| Share-Based Payment Arrangement, Nonemployee [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)	8,333
Share-Based Payment Arrangement, Expense	$ 19,700	22,900
Restricted Stock [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 2,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	2 months 15 days
Share-Based Payment Arrangement, Expense	$ (15,000)	$ (20,000)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	617,978
Restricted Stock [Member] \| Territory Manager [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)		2 years
Deferred Compensation Arrangement with Individual, Shares Authorized for Issuance (in shares)	18,947
Restricted Stock [Member] \| Board of Directors [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 132,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	3 months
Share-Based Payment Arrangement, Expense	$ 576,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	617,978
Share Price (in dollars per share)	$ 0.89
Restricted Stock [Member] \| Board of Directors [Member] \| Share-Based Payment Arrangement, Tranche One [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage	25.00%
Restricted Stock [Member] \| Board of Directors [Member] \| Share-Based Payment Arrangement, Tranche Two [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage	25.00%
The 2020 Equity Incentive Plan [Member] \| Share-Based Payment Arrangement, Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)		4,000,000	11,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	5 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)	9,174,520	323,190