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Note 10 - Per Share Data - Antidilutive Securities Excluded from Computation (Details) - shares	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Share-based Payment Arrangement, Option [Member]
Antidilutive securities (in shares)	352,015	364,444
Stock Appreciation Rights (SARs) [Member]
Antidilutive securities (in shares)	0	3,359
Restricted Stock Units (RSUs) [Member]
Antidilutive securities (in shares)	527,082	518,295

X

- Definition

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.

+ References

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 http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

+ Details

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- Details

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