Note 3 - Stock-based Compensation (Details Textual) - USD ($) Pure in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2020
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross	0
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate	0.00%
Share-Based Payment Arrangement, Option [Member]
Share-Based Payment Arrangement, Expense	$ 7,000	$ 87,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 30,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	4 years 2 months 23 days
Restricted Stock [Member]
Share-Based Payment Arrangement, Expense	$ 37,000	$ 54,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 26,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	4 months 17 days
Incentive Plan 2020 [Member]
Common Stock, Capital Shares Reserved for Future Issuance	1,800,000
The2004 Plan Member
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant	5,000,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross	0	0	5,009,750

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
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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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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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Gross number of share options (or share units) granted during the period.

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