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Note 8 - Stock-based Compensation (Details Textual) - USD ($)		3 Months Ended		9 Months Ended
	Jan. 01, 2022	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)				$ 9.87
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value		$ 400,000	$ 300,000	$ 700,000	$ 600,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)				0
Share-Based Payment Arrangement, Expense		181,881	164,392	$ 738,142	642,952
Share-Based Payment Arrangement, Option [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		1,000,000.0		$ 1,000,000.0
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)				1 year 8 months 1 day
Restricted Stock [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		79,000		$ 79,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)				1 year 5 months 26 days
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)				496
Share-Based Payment Arrangement, Expense		$ 17,000	$ 16,000	$ 49,000	$ 27,000
Equity Incentive Plan 2015 [Member]
Percentage of Total Shares Eligible for Plan Reserve, On an Annual Basis				4.00%
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares)	81,531
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)		23,664		23,664

X

- Definition

The percentage of total shares within the plan that may be added to the plan reserve, occurring on an annual basis.

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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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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Number of additional shares authorized for issuance under share-based payment arrangement.

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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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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

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

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