Note 11 - Share-based Compensation (Details Textual) - USD ($)	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
The 2008 Plan [Member]
Share-Based Payment Arrangement, Expense	$ 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Net of Forfeitures (in shares)	0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 0	$ 8,000
The 2020 Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Net of Forfeitures (in shares)	0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 0	0
Inducement Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Net of Forfeitures (in shares)	0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 0	45,000
Share-Based Payment Arrangement, Expense, Tax Benefit	0	5,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	0
Share-Based Payment Arrangement, Expense (Reversal)	$ (6,000)	19,000
The 2018 Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value		$ 8,000
Oustanding Stock Options and Unvested RSU's [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)	0
Oustanding Stock Options and Unvested RSU's [Member] \| Minimum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)	1 year
Oustanding Stock Options and Unvested RSU's [Member] \| Maximum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)		4 years
Share-Based Payment Arrangement, Option [Member] \| The 2008 Plan [Member]
Share-Based Payment Arrangement, Expense	$ 1,000	$ 6,000
Share-Based Payment Arrangement, Expense, Tax Benefit	0	2,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	0
Share-Based Payment Arrangement, Option [Member] \| The 2020 Plan [Member]
Share-Based Payment Arrangement, Expense	47,000	58,000
Share-Based Payment Arrangement, Expense, Tax Benefit	12,000	15,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 58,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	1 year 1 month 6 days
Share-Based Payment Arrangement, Option [Member] \| CEO Inducement Plan [Member]
Share-Based Payment Arrangement, Expense	$ 0	85,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value	0
Share-Based Payment Arrangement, Expense, Tax Benefit	0	21,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	0
Restricted Stock [Member] \| The 2018 Plan [Member]
Share-Based Payment Arrangement, Expense	$ 235,000	101,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 78,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	3 months 18 days
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	304,513
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested	$ 104,000	$ 120,000

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

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
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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.

+ References

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

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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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Net number of share options (or share units) granted during the period.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Intrinsic value of vested award under share-based payment arrangement. Excludes share and unit options.

+ References

No definition available.

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