Note 9 - Stockholders' Equity - Summary of Shares to be Issued (Details) - shares	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Shares-to-be-issued, outstanding (in shares)	2,440,878	2,375,760
Granted in current period (in shares)	33,238	102,768
Issued in current period (in shares)	(65,965)	(11,995)
Shares-to be issued outstanding (in shares)	2,408,151	2,466,533

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

No definition available.

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- 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (l)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

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Period Type:	duration