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Note 6 - Stock-based Compensation Plans (Tables)

3 Months Ended

Mar. 31, 2021

Notes Tables

Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

						Weighted
		Number				Average
		of				Grant Date
			Shares			Fair Value
Nonvested at January 1, 2020			32,650			$	53.93
Granted			-				-
Vested			-				-
Forfeited			-				-
Nonvested at March 31, 2020			32,650			$	53.93

X

- Definition

Tabular disclosure of the changes in outstanding nonvested restricted stock units.

+ 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)(2)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_TableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration