Note 9 - Net Income (Loss) Per Share (Details Textual) - $ / shares	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Antidilutive Securities Excluded From Computation Of Earnings Weighted Average Shares Outstanding (in shares)	491,168		488,705
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	633,408	145,950	524,568	139,075
Antidilutive Securities Excluded from Computation of Earnings Per Share, Weight Average Exercise Price (in dollars per share)	$ 21.85	$ 25.79	$ 22.57	$ 25.77

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257

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