Annual stock based compensation service fee.

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- Definition

Semi annual stock based compensation payment.

+ References

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Share-based compensation arrangement by share-based payment award, period options can be exercised after grant date.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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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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Amount of cost to be recognized for option 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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Discount rate from fair value on offering date that participants pay for shares.

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Date the equity-based award expires, in YYYY-MM-DD format.

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

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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

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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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Number of shares issued under share-based payment arrangement.

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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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Number of share options (or share units) exercised during the current period.

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Note 3 - Stock-Based Compensation and Shareholders' Equity (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Allocated share-based compensation expense	$ 19,000	$ 20,000
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized	$ 259,000
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition	59 months
Share-based compensation arrangement by share-based payment award, options, grants in period, gross	40,000	35,000
Share-based compensation arrangement by share-based payment award, options, forfeitures in period	24,275	22,600
Share-based compensation arrangement by share-based payment award, options, outstanding, number	137,275	121,550	121,550	109,150
Share-based compensation arrangement by share-based payment award, options, grants in period, weighted average grant date fair value	$ 3.08	$ 4.11
Non-Employee [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares authorized	50,000
Share-based compensation arrangement by share-based payment award, shares issued	3,270
Stock repurchase program remaining number of shares	46,730
Annual stock based compensation service fee	$ 8,000
Semi annual stock based compensation payment	$ 4,000
The 2015 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares authorized	300,000
Share-based compensation arrangement by share-based payment award, options, grants in period, gross	252,550
Share-based compensation arrangement by share-based payment award, options, forfeitures in period	167,375
Share-based compensation arrangement by share-based payment award, options, exercises in period	20,825
Share-based compensation arrangement by share-based payment award, options, outstanding, number	137,275
Employee Stock Purchase Plan 2021 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Allocated share-based compensation expense	$ 0	$ 0
Share-based compensation arrangement by share-based payment award, number of shares authorized	30,000
Share-based compensation arrangement by share-based payment award, shares issued	13,894
Discount rate on common stock	10.00%
Expiration date	May 31, 2026
Director Compensation Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Allocated share-based compensation expense	$ 18,000	$ 20,000
Employee Stock Option [Member] \| The 2015 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, period options can be exercised after grant date	6 months
Share-based compensation arrangement by share-based payment award, expiration period	5 years
Share-based compensation arrangement by share-based payment award, award vesting period	3 years
Employee Stock Option [Member] \| The 2015 Plan [Member] \| First Anniversary [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage	20.00%
Employee Stock Option [Member] \| The 2015 Plan [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, expiration period	10 years