Note 6 - Stockholders' Equity - Summary of Shares to be Issued (Details) - shares	6 Months Ended
Jun. 30, 2023	Jun. 30, 2022
Shares-to-be-issued, outstanding (in shares)	2,440,673	2,066,343
Granted in current period (in shares)	322,092	108,148
Issued in current period (in shares)	0	(147,338)
Shares-to be issued outstanding June 30, 2023 and 2022, respectively (in shares)	2,762,765	2,027,153

Number of shares granted pursuant to the terms of a deferred compensation arrangement.

No definition available.

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Data Type:	xbrli:sharesItemType
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Period Type:	duration

- Definition

The maximum number of shares authorized for issuance under the deferred compensation arrangement as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of shares issued pursuant to the terms of a deferred compensation arrangement.

+ References

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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration