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Note 3 - Earnings Per Share (Details Textual) - shares | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Weighted Average Number of Shares Outstanding, Basic and Diluted (in shares) | 9,122,747 | 9,219,195
Weighted Average Number Diluted Shares Outstanding Adjustment, Total (in shares) | 0 | 0

X
- Definition The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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