Note 8 - Earnings Per Share - Calculation of Basic and Diluted Weighted Average Common Shares (Details) - shares	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Weighted average common shares outstanding basic earnings per share (in shares)	6,688,087	6,640,272
Effect of potential common share issuance:
Dilutive effect of Stock options and unvested shares (in shares)	15,622	0
Weighted average common shares outstanding
Diluted earnings per share (in shares)	6,703,709	6,640,272

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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