Note 5 - Stock-based Compensation (Details Textual) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2024 USD ($) $ / shares shares	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) $ / shares shares	Jun. 30, 2023 USD ($)
Share-Based Payment Arrangement, Nonemployee [Member]
Share-Based Payment Arrangement, Expense	$ 0	$ 0	$ 0	$ 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number \| shares	667		667
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price \| $ / shares	$ 33.75		$ 33.75
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value	$ 0		$ 0
Share-Based Payment Arrangement, Nonemployee [Member] \| Share-Based Payment Arrangement, Option [Member]
Share-Based Payment Arrangement, Expense	$ 0	$ 0	$ 0	$ 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period After Term Ends			90 years
The 2016 Equity Plan [Member]
Percent of Shares Authorized Under Plan, Aggregate Shares Issued and Outstanding	12.5		12.5
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant \| shares	2,086,655		2,086,655

Percent of total shares authorized.

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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.

+ References

No definition available.

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- Definition

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 S45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479983/718-10-S45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
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-Section 50
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-Publisher FASB
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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
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- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

+ References

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- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

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