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Note 10 - Share-based Compensation - Restricted Share Activities (Details) - Restricted Stock [Member] - The 2017 Omnibus Incentive Plan [Member] - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Outstanding, number of shares (in shares)	130,946	154,575	155,250
Outstanding, weighted average grant date fair value (in dollars per share)	$ 17.30	$ 17.19	$ 19.94
Granted, number of shares (in shares)	15,164	14,394	112,427
Granted, weighted average grant date fair value (in dollars per share)	$ 14.64	$ 12.82	$ 14.11
Vested, number of shares (in shares)	(22,683)	(38,023)	(113,102)
Vested, weighted average grant date fair value (in dollars per share)	$ 14.78	$ 15.19	$ 17.90
Forfeited, number of shares (in shares)	(40,679)	0	0
Forfeited, weighted average grant date fair value (in dollars per share)	$ 14.00	$ 0	$ 0
Outstanding, number of shares (in shares)	82,748	130,946	154,575
Outstanding, weighted average grant date fair value (in dollars per share)	$ 19.12	$ 17.30	$ 17.19
Expected to vest, number of shares (in shares)	7,748
Expected to vest, weighted average grant date fair value (in dollars per share)	$ 12.52

X

- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) expected to vest for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ References

No definition available.

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- Definition

Number of fully expected to vest equity-based payment instruments, excluding stock (or unit) options outstanding that can be converted into shares.

+ References

No definition available.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ 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 (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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