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Note 3 - Shares - Basic and Diluted (Details Textual) - shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Weighted Average Number of Shares Outstanding, Basic and Diluted (in shares)	19,327,739	19,254,783

X

- Definition

Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

+ References

No definition available.

+ Details

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