Note 10 - Stock-based Compensation (Details Textual) $ / shares in Units, $ in Thousands	9 Months Ended
Sep. 30, 2023 USD ($) $ / shares shares	Sep. 30, 2022 USD ($)
Share-Based Payment Arrangement, Nonemployee [Member]
Share-Based Payment Arrangement, Expense	$ 0	$ 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number \| shares	667
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price \| $ / shares	$ 33.75
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value	$ 0
Share-Based Payment Arrangement, Nonemployee [Member] \| Share-Based Payment Arrangement, Option [Member]
Share-Based Payment Arrangement, Expense	$ 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
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant \| shares	2,086,655

Percent of total shares authorized.

No definition available.

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- Definition

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
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479830/718-10-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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- Definition

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

+ References

+ Details

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(ii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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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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